Repository: warrensbox/terraform-switcher (go)

Issue:
Use new releases API
#224 was an initial fix after the announcement of [the releases API](https://www.hashicorp.com/blog/announcing-the-hashicorp-releases-api) but the current implementation uses the old (but still supported) releases endpoint.


Discussion:

Patch:
diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ $(EXE): go.mod *.go lib/*.go
 .PHONY: release
 release: $(EXE) darwin linux
 
-.PHONY: darwin linux 
+.PHONY: darwin linux
 darwin linux:
 	GOOS=$@ go build -ldflags "-X main.version=$(VER)" -o $(EXE)-$(VER)-$@-$(GOARCH) $(PKG)
 
@@ -32,4 +32,3 @@ install: $(EXE)
 .PHONY: docs
 docs:
 	cd docs; bundle install --path vendor/bundler; bundle exec jekyll build -c _config.yml; cd ..
-
diff --git a/go.mod b/go.mod
--- a/go.mod
+++ b/go.mod
@@ -3,40 +3,43 @@ module github.com/warrensbox/terraform-switcher
 go 1.18
 
 require (
-	github.com/hashicorp/go-version v1.4.0
+	github.com/go-openapi/strfmt v0.21.2
+	github.com/hashicorp/go-version v1.5.0
 	github.com/hashicorp/hcl2 v0.0.0-20191002203319-fb75b3253c80
 	github.com/hashicorp/terraform-config-inspect v0.0.0-20211115214459-90acf1ca460f
-	github.com/manifoldco/promptui v0.2.2-0.20180308161052-c0c0d3afc6a0
+	github.com/manifoldco/promptui v0.9.0
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/pborman/getopt v0.0.0-20170112200414-7148bc3a4c30
-	github.com/spf13/viper v1.4.0
-	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c
+	github.com/pborman/getopt v1.1.0
+	github.com/spf13/viper v1.11.0
+	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a
 )
 
 require (
 	github.com/agext/levenshtein v1.2.2 // indirect
 	github.com/apparentlymart/go-textseg v1.0.0 // indirect
-	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
-	github.com/chzyer/logex v1.1.10 // indirect
-	github.com/chzyer/readline v0.0.0-20171208011716-f6d7a1f6fbf3 // indirect
-	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
-	github.com/fsnotify/fsnotify v1.4.7 // indirect
-	github.com/google/go-cmp v0.3.1 // indirect
+	github.com/asaskevich/govalidator v0.0.0-20200907205600-7a23bdc65eef // indirect
+	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
+	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/go-openapi/errors v0.19.8 // indirect
+	github.com/go-stack/stack v1.8.0 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/hcl/v2 v2.0.0 // indirect
-	github.com/juju/ansiterm v0.0.0-20180109212912-720a0952cc2a // indirect
-	github.com/lunixbochs/vtclean v0.0.0-20170504063817-d14193dfc626 // indirect
-	github.com/magiconair/properties v1.8.1 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.3 // indirect
+	github.com/magiconair/properties v1.8.6 // indirect
 	github.com/mitchellh/go-wordwrap v1.0.0 // indirect
-	github.com/mitchellh/mapstructure v1.1.2 // indirect
-	github.com/pelletier/go-toml v1.4.0 // indirect
-	github.com/spf13/afero v1.2.2 // indirect
-	github.com/spf13/cast v1.3.0 // indirect
+	github.com/mitchellh/mapstructure v1.4.3 // indirect
+	github.com/oklog/ulid v1.3.1 // indirect
+	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/pelletier/go-toml/v2 v2.0.0-beta.8 // indirect
+	github.com/spf13/afero v1.8.2 // indirect
+	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.3 // indirect
-	github.com/zclconf/go-cty v1.8.0 // indirect
-	golang.org/x/text v0.3.5 // indirect
-	gopkg.in/yaml.v2 v2.2.2 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	github.com/zclconf/go-cty v1.1.0 // indirect
+	go.mongodb.org/mongo-driver v1.7.5 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	gopkg.in/ini.v1 v1.66.4 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
 )
diff --git a/go.sum b/go.sum
--- a/go.sum
+++ b/go.sum
@@ -1,70 +1,153 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
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+cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
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 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
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 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
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-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 howett.net/plist v0.0.0-20181124034731-591f970eefbb/go.mod h1:vMygbs4qMhSZSc4lCUl2OEE+rDiIIJAIdR4m7MiMcm0=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
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diff --git a/lib/download.go b/lib/download.go
--- a/lib/download.go
+++ b/lib/download.go
@@ -17,8 +17,7 @@ func DownloadFromURL(installLocation string, url string) (string, error) {
 
 	response, err := http.Get(url)
 	if err != nil {
-		fmt.Println("[Error] : Error while downloading", url, "-", err)
-		return "", err
+		return "", fmt.Errorf("[Error] : Error while downloading from %s\n%q", url, err)
 	}
 	defer response.Body.Close()
 
@@ -31,15 +30,13 @@ func DownloadFromURL(installLocation string, url string) (string, error) {
 	zipFile := filepath.Join(installLocation, fileName)
 	output, err := os.Create(zipFile)
 	if err != nil {
-		fmt.Println("[Error] : Error while creating", zipFile, "-", err)
-		return "", err
+		return "", fmt.Errorf("[Error] : Error while creating file: %s\n%q", zipFile, err)
 	}
 	defer output.Close()
 
 	n, err := io.Copy(output, response.Body)
 	if err != nil {
-		fmt.Println("[Error] : Error while downloading", url, "-", err)
-		return "", err
+		return "", fmt.Errorf("[Error] : Error while parsing response body from %s\n%q", url, err)
 	}
 
 	fmt.Println(n, "bytes downloaded")
diff --git a/lib/files.go b/lib/files.go
--- a/lib/files.go
+++ b/lib/files.go
@@ -4,6 +4,7 @@ import (
 	"archive/zip"
 	"bufio"
 	"bytes"
+	"encoding/json"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -41,10 +42,7 @@ func RemoveFiles(src string) {
 // CheckFileExist : check if file exist in directory
 func CheckFileExist(file string) bool {
 	_, err := os.Stat(file)
-	if err != nil {
-		return false
-	}
-	return true
+	return err == nil
 }
 
 // Unzip will decompress a zip archive, moving all files and folders
@@ -74,7 +72,10 @@ func Unzip(src string, dest string) ([]string, error) {
 		if f.FileInfo().IsDir() {
 
 			// Make Folder
-			os.MkdirAll(fpath, os.ModePerm)
+			err := os.MkdirAll(fpath, os.ModePerm)
+			if err != nil {
+				return nil, err
+			}
 
 		} else {
 
@@ -115,29 +116,40 @@ func CreateDirIfNotExist(dir string) {
 }
 
 //WriteLines : writes into file
-func WriteLines(lines []string, path string) (err error) {
+func WriteLines(tfReleases []*Release, path string) error {
 	var (
 		file *os.File
 	)
-
-	if file, err = os.Create(path); err != nil {
+	file, err := os.Create(path)
+	if err != nil {
 		return err
 	}
 	defer file.Close()
 
-	for _, item := range lines {
-		_, err := file.WriteString(strings.TrimSpace(item) + "\n")
+	for _, release := range tfReleases {
+
+		b, err := json.Marshal(release)
+		if err != nil {
+			fmt.Println(err)
+			break
+		}
+		_, err = file.Write(b)
 		if err != nil {
 			fmt.Println(err)
 			break
 		}
-	}
 
+		_, err = file.WriteString("\n")
+		if err != nil {
+			fmt.Println(err)
+			break
+		}
+	}
 	return nil
 }
 
-// ReadLines : Read a whole file into the memory and store it as array of lines
-func ReadLines(path string) (lines []string, err error) {
+// ReadLines : Read a whole file into the memory and store it as slice of Release's
+func ReadLines(path string) (tfReleases []*Release, err error) {
 	var (
 		file   *os.File
 		part   []byte
@@ -156,7 +168,11 @@ func ReadLines(path string) (lines []string, err error) {
 		}
 		buffer.Write(part)
 		if !prefix {
-			lines = append(lines, buffer.String())
+			var release *Release
+			if err := json.Unmarshal(buffer.Bytes(), &release); err != nil {
+				return nil, fmt.Errorf("%q: %s", err, buffer.Bytes())
+			}
+			tfReleases = append(tfReleases, release)
 			buffer.Reset()
 		}
 	}
@@ -188,16 +204,12 @@ func IsDirEmpty(name string) bool {
 func CheckDirHasTGBin(dir, prefix string) bool {
 
 	exist := false
-
 	files, err := ioutil.ReadDir(dir)
 	if err != nil {
 		log.Fatal(err)
-		//return exist, err
 	}
-	res := []string{}
 	for _, f := range files {
 		if !f.IsDir() && strings.HasPrefix(f.Name(), prefix) {
-			res = append(res, filepath.Join(dir, f.Name()))
 			exist = true
 		}
 	}
diff --git a/lib/install.go b/lib/install.go
--- a/lib/install.go
+++ b/lib/install.go
@@ -7,7 +7,6 @@ import (
 	"os/user"
 	"path/filepath"
 	"runtime"
-	"strings"
 
 	"github.com/hashicorp/go-version"
 )
@@ -17,7 +16,6 @@ const (
 	versionPrefix             = "terraform_"
 	installPath               = ".terraform.versions"
 	recentFile                = "RECENT"
-	defaultBin                = "/usr/local/bin/terraform" //default bin installation dir
 	tfDarwinArm64StartVersion = "1.0.2"
 )
 
@@ -76,12 +74,7 @@ func GetInstallLocation() string {
 }
 
 //Install : Install the provided version in the argument
-func Install(tfversion string, binPath string, mirrorURL string) {
-
-	// if !ValidVersionFormat(tfversion) {
-	// 	fmt.Printf("The provided terraform version format does not exist - %s. Try `tfswitch -l` to see all available versions.\n", tfversion)
-	// 	os.Exit(1)
-	// }
+func Install(tfRelease *Release, binPath string) {
 
 	/* Check to see if user has permission to the default bin location which is  "/usr/local/bin/terraform"
 	 * If user does not have permission to default bin location, proceed to create $HOME/bin and install the tfswitch there
@@ -97,14 +90,16 @@ func Install(tfversion string, binPath string, mirrorURL string) {
 	goos := runtime.GOOS
 
 	// Terraform darwin arm64 comes with 1.0.2 and next version
-	tfver, _ := version.NewVersion(tfversion)
-	tf102, _ := version.NewVersion(tfDarwinArm64StartVersion)
-	if goos == "darwin" && goarch == "arm64" && tfver.LessThan(tf102) {
+	tf102, err := version.NewVersion(tfDarwinArm64StartVersion)
+	if err != nil {
+		log.Fatalf("Error generating terraform version for %q: %s", tfDarwinArm64StartVersion, err)
+	}
+	if goos == "darwin" && goarch == "arm64" && tfRelease.Version.LessThan(tf102) {
 		goarch = "amd64"
 	}
 
 	/* check if selected version already downloaded */
-	installFileVersionPath := ConvertExecutableExt(filepath.Join(installLocation, versionPrefix+tfversion))
+	installFileVersionPath := ConvertExecutableExt(filepath.Join(installLocation, versionPrefix+tfRelease.Version.String()))
 	fileExist := CheckFileExist(installFileVersionPath)
 
 	/* if selected version already exist, */
@@ -119,20 +114,22 @@ func Install(tfversion string, binPath string, mirrorURL string) {
 
 		/* set symlink to desired version */
 		CreateSymlink(installFileVersionPath, binPath)
-		fmt.Printf("Switched terraform to version %q \n", tfversion)
-		AddRecent(tfversion) //add to recent file for faster lookup
+		fmt.Printf("Switched terraform to version %q \n", tfRelease.Version)
+		AddRecent(tfRelease) //add to recent file for faster lookup
 		os.Exit(0)
 	}
 
-	//if does not have slash - append slash
-	hasSlash := strings.HasSuffix(mirrorURL, "/")
-	if !hasSlash {
-		mirrorURL = fmt.Sprintf("%s/", mirrorURL)
-	}
-
 	/* if selected version already exist, */
 	/* proceed to download it from the hashicorp release page */
-	url := mirrorURL + tfversion + "/" + versionPrefix + tfversion + "_" + goos + "_" + goarch + ".zip"
+	url := ""
+	for _, build := range tfRelease.Builds {
+		if build.OS == goos && build.Arch == goarch {
+			url = build.URL
+		}
+	}
+	if url == "" {
+		log.Fatalln("Couldn't determine download url from release")
+	}
 	zipFile, errDownload := DownloadFromURL(installLocation, url)
 
 	/* If unable to download file from url, exit(1) immediately */
@@ -165,56 +162,56 @@ func Install(tfversion string, binPath string, mirrorURL string) {
 
 	/* set symlink to desired version */
 	CreateSymlink(installFileVersionPath, binPath)
-	fmt.Printf("Switched terraform to version %q \n", tfversion)
-	AddRecent(tfversion) //add to recent file for faster lookup
+	fmt.Printf("Switched terraform to version %q \n", tfRelease.Version)
+	AddRecent(tfRelease) //add to recent file for faster lookup
 	os.Exit(0)
 }
 
 // AddRecent : add to recent file
-func AddRecent(requestedVersion string) {
+func AddRecent(requestedRelease *Release) {
 
 	installLocation = GetInstallLocation() //get installation location -  this is where we will put our terraform binary file
 	versionFile := filepath.Join(installLocation, recentFile)
 
 	fileExist := CheckFileExist(versionFile)
 	if fileExist {
-		lines, errRead := ReadLines(versionFile)
+		releases, errRead := ReadLines(versionFile)
 
 		if errRead != nil {
+			fmt.Println("File dirty or encountered issue while parsing Release metadata. Recreating cache file.")
+			RemoveFiles(versionFile)
+			CreateRecentFile(requestedRelease)
 			fmt.Printf("[Error] : %s\n", errRead)
 			return
 		}
 
-		for _, line := range lines {
-			if !ValidVersionFormat(line) {
-				fmt.Println("File dirty. Recreating cache file.")
-				RemoveFiles(versionFile)
-				CreateRecentFile(requestedVersion)
-				return
-			}
-		}
-
-		versionExist := VersionExist(requestedVersion, lines)
+		versionExist := VersionExist(requestedRelease, releases)
 
 		if !versionExist {
-			if len(lines) >= 3 {
-				_, lines = lines[len(lines)-1], lines[:len(lines)-1]
-
-				lines = append([]string{requestedVersion}, lines...)
-				WriteLines(lines, versionFile)
+			if len(releases) >= 3 {
+				_, releases = releases[len(releases)-1], releases[:len(releases)-1]
+
+				releases = append([]*Release{requestedRelease}, releases...)
+				err := WriteLines(releases, versionFile)
+				if err != nil {
+					log.Fatalf("Encountered error while updating versions file: %s\n", err)
+				}
 			} else {
-				lines = append([]string{requestedVersion}, lines...)
-				WriteLines(lines, versionFile)
+				releases = append([]*Release{requestedRelease}, releases...)
+				err := WriteLines(releases, versionFile)
+				if err != nil {
+					log.Fatalf("Encountered error while updating versions file: %s\n", err)
+				}
 			}
 		}
 
 	} else {
-		CreateRecentFile(requestedVersion)
+		CreateRecentFile(requestedRelease)
 	}
 }
 
 // GetRecentVersions : get recent version from file
-func GetRecentVersions() ([]string, error) {
+func GetRecentVersions() ([]*Release, error) {
 
 	installLocation = GetInstallLocation() //get installation location -  this is where we will put our terraform binary file
 	versionFile := filepath.Join(installLocation, recentFile)
@@ -222,20 +219,22 @@ func GetRecentVersions() ([]string, error) {
 	fileExist := CheckFileExist(versionFile)
 	if fileExist {
 
-		lines, errRead := ReadLines(versionFile)
-		outputRecent := []string{}
+		localReleases, errRead := ReadLines(versionFile)
+		outputRecent := []*Release{}
 
 		if errRead != nil {
-			fmt.Printf("Error: %s\n", errRead)
-			return nil, errRead
+			fmt.Println("File dirty or encountered issue while parsing Release metadata. Deleting cache file.")
+			RemoveFiles(versionFile)
+			return nil, fmt.Errorf("Error: %s\n", errRead)
 		}
 
-		for _, line := range lines {
+		for _, release := range localReleases {
 			/* 	checks if versions in the recent file are valid.
 			If any version is invalid, it will be consider dirty
 			and the recent file will be removed
 			*/
-			if !ValidVersionFormat(line) {
+
+			if !ValidVersionFormat(release.Version.String()) {
 				RemoveFiles(versionFile)
 				return nil, errRead
 			}
@@ -243,7 +242,8 @@ func GetRecentVersions() ([]string, error) {
 			/* 	output can be confusing since it displays the 3 most recent used terraform version
 			append the string *recent to the output to make it more user friendly
 			*/
-			outputRecent = append(outputRecent, fmt.Sprintf("%s *recent", line))
+			release.LocalCacheTag = "*recent"
+			outputRecent = append(outputRecent, release)
 		}
 
 		return outputRecent, nil
@@ -253,11 +253,14 @@ func GetRecentVersions() ([]string, error) {
 }
 
 //CreateRecentFile : create a recent file
-func CreateRecentFile(requestedVersion string) {
+func CreateRecentFile(requestedVersion *Release) {
 
 	installLocation = GetInstallLocation() //get installation location -  this is where we will put our terraform binary file
 
-	WriteLines([]string{requestedVersion}, filepath.Join(installLocation, recentFile))
+	err := WriteLines([]*Release{requestedVersion}, filepath.Join(installLocation, recentFile))
+	if err != nil {
+		log.Fatalf("Encountered error while updating versions file: %s\n", err)
+	}
 }
 
 //ConvertExecutableExt : convert excutable with local OS extension
@@ -285,7 +288,7 @@ func InstallableBinLocation(userBinPath string) string {
 	binDir := Path(userBinPath)           //get path directory from binary path
 	binPathExist := CheckDirExist(binDir) //the default is /usr/local/bin but users can provide custom bin locations
 
-	if binPathExist == true { //if bin path exist - check if we can write to to it
+	if binPathExist { //if bin path exist - check if we can write to to it
 
 		binPathWritable := false //assume bin path is not writable
 		if runtime.GOOS != "windows" {
@@ -293,7 +296,7 @@ func InstallableBinLocation(userBinPath string) string {
 		}
 
 		// IF: "/usr/local/bin" or `custom bin path` provided by user is non-writable, (binPathWritable == false), we will attempt to install terraform at the ~/bin location. See ELSE
-		if binPathWritable == false {
+		if !binPathWritable {
 
 			homeBinExist := CheckDirExist(filepath.Join(usr.HomeDir, "bin")) //check to see if ~/bin exist
 			if homeBinExist {                                                //if ~/bin exist, install at ~/bin/terraform
diff --git a/lib/list_versions.go b/lib/list_versions.go
--- a/lib/list_versions.go
+++ b/lib/list_versions.go
@@ -1,178 +1,195 @@
 package lib
 
 import (
+	"bytes"
+	"encoding/json"
 	"fmt"
-	"io/ioutil"
-	"log"
+	"io"
 	"net/http"
-	"os"
-	"reflect"
+	"net/url"
 	"regexp"
-	"strings"
+	"sort"
+	"strconv"
+
+	"github.com/go-openapi/strfmt"
+	semver "github.com/hashicorp/go-version"
 )
 
-type tfVersionList struct {
-	tflist []string
+type Release struct {
+	Builds []struct {
+		Arch string `json:"arch"`
+		OS   string `json:"os"`
+		URL  string `json:"url"`
+	} `json:"builds"`
+	IsPrerelease     bool `json:"is_prerelease"`
+	LocalCacheTag    string
+	TimestampCreated strfmt.DateTime `json:"timestamp_created"`
+	Version          *semver.Version `json:"version"`
 }
 
-//GetTFList :  Get the list of available terraform version given the hashicorp url
-func GetTFList(mirrorURL string, preRelease bool) ([]string, error) {
-
-	result, error := GetTFURLBody(mirrorURL)
+//GetTFLatest :  Get the latest terraform version given the hashicorp url
+func GetTFLatest(mirrorURL string) (*Release, error) {
+	tfReleases, error := GetTFReleases(mirrorURL, false)
 	if error != nil {
 		return nil, error
 	}
+	if len(tfReleases) > 0 {
+		return tfReleases[0], nil
+	}
+	return nil, fmt.Errorf("list of releases returned from API was empty")
+}
 
-	var tfVersionList tfVersionList
-	var semver string
-	if preRelease == true {
-		// Getting versions from body; should return match /X.X.X-@/ where X is a number,@ is a word character between a-z or A-Z
-		semver = `\/(\d+\.\d+\.\d+)(-[a-zA-z]+\d*)?"`
-	} else if preRelease == false {
-		// Getting versions from body; should return match /X.X.X/ where X is a number
-		// without the ending '"' pre-release folders would be tried and break.
-		semver = `\/(\d+\.\d+\.\d+)\/?"`
-	}
-	r, _ := regexp.Compile(semver)
-	for i := range result {
-		if r.MatchString(result[i]) {
-			str := r.FindString(result[i])
-			trimstr := strings.Trim(str, "/\"") //remove '/' or '"' from /X.X.X/" or /X.X.X"
-			tfVersionList.tflist = append(tfVersionList.tflist, trimstr)
+//GetTFLatestImplicit :  Get the latest implicit terraform version given the hashicorp url
+func GetTFLatestImplicit(mirrorURL string, preRelease bool, version string) (*Release, error) {
+	tfReleases, err := GetTFReleases(mirrorURL, preRelease)
+	if err != nil {
+		return nil, err
+	}
+	if preRelease {
+		semver := fmt.Sprintf(`%s{1}\.\d+\-[a-zA-z]+\d*`, version)
+		r, err := regexp.Compile(semver)
+		if err != nil {
+			return nil, err
 		}
+		for _, release := range tfReleases {
+			if release.IsPrerelease && r.MatchString(release.Version.String()) {
+				fmt.Printf("Matched version: %s\n", release.Version)
+				return release, nil
+			}
+		}
+		return nil, fmt.Errorf("Error: no match for requested version: %s", version)
+	} else {
+		version = fmt.Sprintf("~> %v", version)
+		semv, err := SemVerParser(&version, tfReleases)
+		return semv, err
 	}
+}
 
-	if len(tfVersionList.tflist) == 0 {
-		fmt.Printf("Cannot get list from mirror: %s\n", mirrorURL)
-	}
+// httpGet : generic http get client for the given url and query parameters.
+func httpGet(url *url.URL, values url.Values) (*http.Response, error) {
+	url.RawQuery = values.Encode()
 
-	return tfVersionList.tflist, nil
+	res, err := http.Get(url.String())
+	if err != nil {
+		return nil, fmt.Errorf("[Error] : Retrieving contents from url %s\n: %q", url, err)
 
+	}
+	if res.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("[Error] : non-200 response code during request: %d: Http status: %s", res.StatusCode, res.Status)
+	}
+	return res, nil
 }
 
-//GetTFLatest :  Get the latest terraform version given the hashicorp url
-func GetTFLatest(mirrorURL string) (string, error) {
-
-	result, error := GetTFURLBody(mirrorURL)
-	if error != nil {
-		return "", error
-	}
-	// Getting versions from body; should return match /X.X.X/ where X is a number
-	semver := `\/(\d+\.\d+\.\d+)\/?"`
-	r, _ := regexp.Compile(semver)
-	for i := range result {
-		if r.MatchString(result[i]) {
-			str := r.FindString(result[i])
-			trimstr := strings.Trim(str, "/\"") //remove '/' or '"' from /X.X.X/" or /X.X.X"
-			return trimstr, nil
-		}
+// getReleases : subfunc for GetTFReleases, used in a loop to get all terraform releases given the hashicorp url
+func getReleases(url *url.URL, values url.Values) ([]*Release, error) {
+	var releases []*Release
+	resp, errURL := httpGet(url, values)
+	if errURL != nil {
+		return nil, fmt.Errorf("[Error] : Getting url: %q", errURL)
 	}
 
-	return "", nil
+	defer resp.Body.Close()
+	body := new(bytes.Buffer)
+	if _, err := io.Copy(body, resp.Body); err != nil {
+		return nil, err
+	}
+	if err := json.Unmarshal(body.Bytes(), &releases); err != nil {
+		return nil, fmt.Errorf("%q: %s", err, body.String())
+	}
+	return releases, nil
 }
 
-//GetTFLatestImplicit :  Get the latest implicit terraform version given the hashicorp url
-func GetTFLatestImplicit(mirrorURL string, preRelease bool, version string) (string, error) {
-
-	if preRelease == true {
-		//TODO: use GetTFList() instead of GetTFURLBody
-		versions, error := GetTFURLBody(mirrorURL)
-		if error != nil {
-			return "", error
-		}
-		// Getting versions from body; should return match /X.X.X-@/ where X is a number,@ is a word character between a-z or A-Z
-		semver := fmt.Sprintf(`\/(%s{1}\.\d+\-[a-zA-z]+\d*)\/?"`, version)
-		r, err := regexp.Compile(semver)
-		if err != nil {
-			return "", err
-		}
-		for i := range versions {
-			if r.MatchString(versions[i]) {
-				str := r.FindString(versions[i])
-				trimstr := strings.Trim(str, "/\"") //remove '/' or '"' from /X.X.X/" or /X.X.X"
-				return trimstr, nil
-			}
-		}
-	} else if preRelease == false {
-		listAll := false
-		tflist, _ := GetTFList(mirrorURL, listAll) //get list of versions
-		version = fmt.Sprintf("~> %v", version)
-		semv, err := SemVerParser(&version, tflist)
+//GetTFReleases :  Get all terraform releases given the hashicorp url
+func GetTFReleases(mirrorURL string, preRelease bool) ([]*Release, error) {
+	limit := 20
+	u, err := url.Parse(mirrorURL)
+	if err != nil {
+		return nil, fmt.Errorf("[Error] : parsing url: %q", err)
+	}
+	values := u.Query()
+	values.Set("limit", strconv.Itoa(limit))
+	releaseSet, err := getReleases(u, values)
+	if err != nil {
+		return nil, err
+	}
+	var releases []*Release
+	releases = append(releases, releaseSet...)
+	for len(releaseSet) == limit {
+		values.Set("after", releaseSet[len(releaseSet)-1].TimestampCreated.String())
+		releaseSet, err = getReleases(u, values)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
-		return semv, nil
+		releases = append(releases, releaseSet...)
+	}
+	if !preRelease {
+		releases = removePreReleases(releases)
 	}
-	return "", nil
+	sort.Slice(releases, func(i, j int) bool {
+		return releases[i].Version.GreaterThan(releases[j].Version)
+	})
+	return releases, nil
 }
 
-//GetTFURLBody : Get list of terraform versions from hashicorp releases
-func GetTFURLBody(mirrorURL string) ([]string, error) {
-
-	hasSlash := strings.HasSuffix(mirrorURL, "/")
-	if !hasSlash { //if does not have slash - append slash
-		mirrorURL = fmt.Sprintf("%s/", mirrorURL)
+//GetTFRelease :  Get the requested terraform release given the hashicorp url
+func GetTFRelease(mirrorURL, requestedVersion string) (*Release, error) {
+	url, err := url.Parse(mirrorURL + "/" + requestedVersion)
+	if err != nil {
+		return nil, fmt.Errorf("[Error] : parsing URL: %q", err)
 	}
-	resp, errURL := http.Get(mirrorURL)
+	resp, errURL := httpGet(url, nil)
 	if errURL != nil {
-		log.Printf("[Error] : Getting url: %v", errURL)
-		os.Exit(1)
-		return nil, errURL
+		return nil, fmt.Errorf("[Error] : Getting url: %q", errURL)
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode != 200 {
-		log.Printf("[Error] : Retrieving contents from url: %s", mirrorURL)
-		os.Exit(1)
+	body := new(bytes.Buffer)
+	if _, err := io.Copy(body, resp.Body); err != nil {
+		return nil, fmt.Errorf("[Error]: parsing http response body: %q", err)
 	}
-
-	body, errBody := ioutil.ReadAll(resp.Body)
-	if errBody != nil {
-		log.Printf("[Error] : reading body: %v", errBody)
-		os.Exit(1)
-		return nil, errBody
+	var release *Release
+	if err := json.Unmarshal(body.Bytes(), &release); err != nil {
+		return nil, fmt.Errorf("%q: %s", err, body)
 	}
+	return release, nil
 
-	bodyString := string(body)
-	result := strings.Split(bodyString, "\n")
+}
 
-	return result, nil
+//removePreReleases : Removes any prerelease versions from a given slice of Release.
+func removePreReleases(releases []*Release) []*Release {
+	realReleases := []*Release{}
+	for i, r := range releases {
+		if !r.IsPrerelease {
+			realReleases = append(realReleases, releases[i])
+		}
+	}
+	return realReleases
 }
 
 //VersionExist : check if requested version exist
-func VersionExist(val interface{}, array interface{}) (exists bool) {
-
-	exists = false
-	switch reflect.TypeOf(array).Kind() {
-	case reflect.Slice:
-		s := reflect.ValueOf(array)
-
-		for i := 0; i < s.Len(); i++ {
-			if reflect.DeepEqual(val, s.Index(i).Interface()) == true {
-				exists = true
-				return exists
-			}
+func VersionExist(rel *Release, releases []*Release) bool {
+	for _, r := range releases {
+		if rel.Version.Equal(r.Version) {
+			return true
 		}
 	}
-
-	return exists
+	return false
 }
 
 //RemoveDuplicateVersions : remove duplicate version
-func RemoveDuplicateVersions(elements []string) []string {
+func RemoveDuplicateVersions(tfReleases []*Release) []*Release {
 	// Use map to record duplicates as we find them.
 	encountered := map[string]bool{}
-	result := []string{}
+	result := []*Release{}
 
-	for _, val := range elements {
-		versionOnly := strings.Trim(val, " *recent")
-		if encountered[versionOnly] == true {
+	for _, release := range tfReleases {
+		if encountered[release.Version.String()] {
 			// Do not add duplicate.
 		} else {
 			// Record this element as an encountered element.
-			encountered[versionOnly] = true
+			encountered[release.Version.String()] = true
 			// Append to result slice.
-			result = append(result, val)
+			result = append(result, release)
 		}
 	}
 	// Return the new slice.
diff --git a/lib/semver.go b/lib/semver.go
--- a/lib/semver.go
+++ b/lib/semver.go
@@ -2,52 +2,37 @@ package lib
 
 import (
 	"fmt"
-	"sort"
 
 	semver "github.com/hashicorp/go-version"
 )
 
-// GetSemver : returns version that will be installed based on server constaint provided
-func GetSemver(tfconstraint *string, mirrorURL *string) (string, error) {
+// GetSemver : returns version that will be installed based on server constraint provided
+func GetSemver(tfconstraint *string, mirrorURL *string) (*Release, error) {
 
-	listAll := true
-	tflist, _ := GetTFList(*mirrorURL, listAll) //get list of versions
+	tfReleases, err := GetTFReleases(*mirrorURL, true)
+	if err != nil {
+		return nil, err
+	}
 	fmt.Printf("Reading required version from constraint: %s\n", *tfconstraint)
-	tfversion, err := SemVerParser(tfconstraint, tflist)
-	return tfversion, err
+	release, err := SemVerParser(tfconstraint, tfReleases)
+	return release, err
 }
 
 // ValidateSemVer : Goes through the list of terraform version, return a valid tf version for contraint provided
-func SemVerParser(tfconstraint *string, tflist []string) (string, error) {
-	tfversion := ""
+func SemVerParser(tfconstraint *string, tfReleases []*Release) (*Release, error) {
 	constraints, err := semver.NewConstraint(*tfconstraint) //NewConstraint returns a Constraints instance that a Version instance can be checked against
 	if err != nil {
-		return "", fmt.Errorf("error parsing constraint: %s", err)
-	}
-	versions := make([]*semver.Version, len(tflist))
-	//put tfversion into semver object
-	for i, tfvals := range tflist {
-		version, err := semver.NewVersion(tfvals) //NewVersion parses a given version and returns an instance of Version or an error if unable to parse the version.
-		if err != nil {
-			return "", fmt.Errorf("error parsing constraint: %s", err)
-		}
-		versions[i] = version
+		return nil, fmt.Errorf("error parsing constraint: %q", err)
 	}
-
-	sort.Sort(sort.Reverse(semver.Collection(versions)))
-
-	for _, element := range versions {
-		if constraints.Check(element) { // Validate a version against a constraint
-			tfversion = element.String()
-			fmt.Printf("Matched version: %s\n", tfversion)
-			if ValidVersionFormat(tfversion) { //check if version format is correct
-				return tfversion, nil
-			}
+	for _, release := range tfReleases {
+		if constraints.Check(release.Version) {
+			fmt.Printf("Matched version: %s\n", release.Version)
+			return release, nil
 		}
 	}
 
 	PrintInvalidTFVersion()
-	return "", fmt.Errorf("error parsing constraint: %s", *tfconstraint)
+	return nil, fmt.Errorf("error parsing constraint: %s", *tfconstraint)
 }
 
 // Print invalid TF version
diff --git a/main.go b/main.go
--- a/main.go
+++ b/main.go
@@ -38,7 +38,7 @@ import (
 )
 
 const (
-	defaultMirror = "https://releases.hashicorp.com/terraform"
+	defaultMirror = "https://api.releases.hashicorp.com/v1/releases/terraform"
 	defaultBin    = "/usr/local/bin/terraform" //default bin installation dir
 	defaultLatest = ""
 	tfvFilename   = ".terraform-version"
@@ -59,7 +59,7 @@ func main() {
 	showLatestStable := getopt.StringLong("show-latest-stable", 'S', defaultLatest, "Show latest implicit version. Ex: tfswitch --show-latest-stable 0.13 prints 0.13.7 (latest)")
 	latestFlag := getopt.BoolLong("latest", 'u', "Get latest stable version")
 	showLatestFlag := getopt.BoolLong("show-latest", 'U', "Show latest stable version")
-	mirrorURL := getopt.StringLong("mirror", 'm', defaultMirror, "Install from a remote other than the default. Default: https://releases.hashicorp.com/terraform")
+	mirrorURL := getopt.StringLong("mirror", 'm', defaultMirror, "Install from a remote API other than the default. Default: "+defaultMirror)
 	chDirPath := getopt.StringLong("chdir", 'c', "", "Switch to a different working directory before executing the given command. Ex: tfswitch --chdir terraform_project will run tfswitch in the terraform_project directory")
 	versionFlag := getopt.BoolLong("version", 'v', "Displays the version of tfswitch")
 	helpFlag := getopt.BoolLong("help", 'h', "Displays help message")
@@ -165,7 +165,7 @@ func main() {
 	/* show latest pre-release implicit version. Ex: tfswitch --latest-pre 0.13 downloads 0.13.0-rc1 (latest) */
 	case *showLatestPre != "":
 		preRelease := true
-		showLatestImplicitVersion(*showLatestPre, custBinPath, mirrorURL, preRelease)
+		showLatestImplicitVersion(*showLatestPre, mirrorURL, preRelease)
 
 	/* latest implicit version. Ex: tfswitch --latest 0.13 downloads 0.13.5 (latest) */
 	case *latestStable != "":
@@ -175,7 +175,7 @@ func main() {
 	/* show latest implicit stable version. Ex: tfswitch --latest 0.13 downloads 0.13.5 (latest) */
 	case *showLatestStable != "":
 		preRelease := false
-		showLatestImplicitVersion(*showLatestStable, custBinPath, mirrorURL, preRelease)
+		showLatestImplicitVersion(*showLatestStable, mirrorURL, preRelease)
 
 	/* latest stable version */
 	case *latestFlag:
@@ -183,7 +183,7 @@ func main() {
 
 	/* show latest stable version */
 	case *showLatestFlag:
-		showLatestVersion(custBinPath, mirrorURL)
+		showLatestVersion(mirrorURL)
 
 	/* version provided on command line as arg */
 	case len(args) == 1:
@@ -232,14 +232,20 @@ func installWithListAll(custBinPath, mirrorURL *string) {
 
 // install latest stable tf version
 func installLatestVersion(custBinPath, mirrorURL *string) {
-	tfversion, _ := lib.GetTFLatest(*mirrorURL)
-	lib.Install(tfversion, *custBinPath, *mirrorURL)
+	tfRelease, err := lib.GetTFLatest(*mirrorURL)
+	if err != nil {
+		log.Fatalf("Error during install: %v\n", err)
+	}
+	lib.Install(tfRelease, *custBinPath)
 }
 
 // show install latest stable tf version
-func showLatestVersion(custBinPath, mirrorURL *string) {
-	tfversion, _ := lib.GetTFLatest(*mirrorURL)
-	fmt.Printf("%s\n", tfversion)
+func showLatestVersion(mirrorURL *string) {
+	tfRelease, err := lib.GetTFLatest(*mirrorURL)
+	if err != nil {
+		log.Fatalf("Error getting latest version: %v\n", err)
+	}
+	fmt.Printf("%s\n", tfRelease.Version)
 }
 
 // install latest - argument (version) must be provided
@@ -249,23 +255,25 @@ func installLatestImplicitVersion(requestedVersion string, custBinPath, mirrorUR
 		fmt.Printf("error parsing constraint: %s\n", err)
 	}
 	//if lib.ValidMinorVersionFormat(requestedVersion) {
-	tfversion, err := lib.GetTFLatestImplicit(*mirrorURL, preRelease, requestedVersion)
-	if err == nil && tfversion != "" {
-		lib.Install(tfversion, *custBinPath, *mirrorURL)
+	tfRelease, err := lib.GetTFLatestImplicit(*mirrorURL, preRelease, requestedVersion)
+	if err == nil && tfRelease.Version != nil {
+		lib.Install(tfRelease, *custBinPath)
 	}
 	fmt.Printf("Error parsing constraint: %s\n", err)
 	lib.PrintInvalidMinorTFVersion()
 }
 
 // show latest - argument (version) must be provided
-func showLatestImplicitVersion(requestedVersion string, custBinPath, mirrorURL *string, preRelease bool) {
+func showLatestImplicitVersion(requestedVersion string, mirrorURL *string, preRelease bool) {
 	if lib.ValidMinorVersionFormat(requestedVersion) {
-		tfversion, _ := lib.GetTFLatestImplicit(*mirrorURL, preRelease, requestedVersion)
-		if len(tfversion) > 0 {
-			fmt.Printf("%s\n", tfversion)
+		tfversion, err := lib.GetTFLatestImplicit(*mirrorURL, preRelease, requestedVersion)
+		if err != nil {
+			log.Fatalf("Couldn't get version %s\nError: %v\n", requestedVersion, err)
+		}
+		if tfversion.Version != nil {
+			fmt.Printf("%s\n", tfversion.Version)
 		} else {
-			fmt.Println("The provided terraform version does not exist. Try `tfswitch -l` to see all available versions.")
-			os.Exit(1)
+			log.Fatalln("The provided terraform version does not exist. Try `tfswitch -l` to see all available versions.")
 		}
 	} else {
 		lib.PrintInvalidMinorTFVersion()
@@ -284,27 +292,25 @@ func installVersion(arg string, custBinPath *string, mirrorURL *string) {
 		if recentDownloadFile {
 			lib.ChangeSymlink(installFileVersionPath, *custBinPath)
 			fmt.Printf("Switched terraform to version %q \n", requestedVersion)
-			lib.AddRecent(requestedVersion) //add to recent file for faster lookup
+			requestedRelease, err := lib.GetTFRelease(*mirrorURL, requestedVersion)
+			if err != nil {
+				log.Fatalf("Error while getting release metadata for: %v\nError: %s\n", requestedVersion, err)
+			}
+			lib.AddRecent(requestedRelease) //add to recent file for faster lookup
 			os.Exit(0)
 		}
 
 		//if the requested version had not been downloaded before
-		listAll := true                                     //set list all true - all versions including beta and rc will be displayed
-		tflist, _ := lib.GetTFList(*mirrorURL, listAll)     //get list of versions
-		exist := lib.VersionExist(requestedVersion, tflist) //check if version exist before downloading it
-
-		if exist {
-			lib.Install(requestedVersion, *custBinPath, *mirrorURL)
-		} else {
-			fmt.Println("The provided terraform version does not exist. Try `tfswitch -l` to see all available versions.")
-			os.Exit(1)
+		tfRelease, err := lib.GetTFRelease(*mirrorURL, requestedVersion) //get requested Terraform Release
+		if err != nil {
+			log.Fatalf("The provided terraform version - %s - does not exist (or check error below). Try `tfswitch -l` to see all available versions.\nError: %q\n", requestedVersion, err)
 		}
+		lib.Install(tfRelease, *custBinPath)
 
 	} else {
 		lib.PrintInvalidTFVersion()
-		fmt.Println("Args must be a valid terraform version")
 		usageMessage()
-		os.Exit(1)
+		log.Fatalln("Args must be a valid terraform version")
 	}
 }
 
@@ -312,9 +318,7 @@ func installVersion(arg string, custBinPath *string, mirrorURL *string) {
 func retrieveFileContents(file string) string {
 	fileContents, err := ioutil.ReadFile(file)
 	if err != nil {
-		fmt.Printf("Failed to read %s file. Follow the README.md instructions for setup. https://github.com/warrensbox/terraform-switcher/blob/master/README.md\n", tfvFilename)
-		fmt.Printf("Error: %s\n", err)
-		os.Exit(1)
+		log.Fatalf("Error: %s\nFailed to read %s file. Follow the README.md instructions for setup. https://github.com/warrensbox/terraform-switcher/blob/master/README.md\n", err, tfvFilename)
 	}
 	tfversion := strings.TrimSuffix(string(fileContents), "\n")
 	return tfversion
@@ -339,19 +343,12 @@ func fileExists(filename string) bool {
 func checkTFModuleFileExist(dir string) bool {
 
 	module, _ := tfconfig.LoadModule(dir)
-	if len(module.RequiredCore) >= 1 {
-		return true
-	}
-	return false
+	return len(module.RequiredCore) >= 1
 }
 
 // checkTFEnvExist - checks if the TF_VERSION environment variable is set
 func checkTFEnvExist() bool {
-	tfversion := os.Getenv("TF_VERSION")
-	if tfversion != "" {
-		return true
-	}
-	return false
+	return os.Getenv("TF_VERSION") != ""
 }
 
 /* parses everything in the toml file, return required version and bin path */
@@ -370,9 +367,7 @@ func getParamsTOML(binPath string, dir string) (string, string) {
 
 	errs := viper.ReadInConfig() // Find and read the config file
 	if errs != nil {
-		fmt.Printf("Unable to read %s provided\n", tomlFilename) // Handle errors reading the config file
-		fmt.Println(errs)
-		os.Exit(1) // exit immediately if config file provided but it is unable to read it
+		log.Fatalf("Error: %s\nUnable to read %s provided\n", errs, tomlFilename) // Handle errors reading the config file
 	}
 
 	bin := viper.Get("bin")                                            // read custom binary location
@@ -398,37 +393,47 @@ func usageMessage() {
 /* listAll = true - all versions including beta and rc will be displayed */
 /* listAll = false - only official stable release are displayed */
 func installOption(listAll bool, custBinPath, mirrorURL *string) {
-	tflist, _ := lib.GetTFList(*mirrorURL, listAll) //get list of versions
-	recentVersions, _ := lib.GetRecentVersions()    //get recent versions from RECENT file
-	tflist = append(recentVersions, tflist...)      //append recent versions to the top of the list
-	tflist = lib.RemoveDuplicateVersions(tflist)    //remove duplicate version
-
-	if len(tflist) == 0 {
-		fmt.Println("[ERROR] : List is empty")
-		os.Exit(1)
+	tfReleases, err := lib.GetTFReleases(*mirrorURL, listAll) //get list of versions
+	if err != nil {
+		log.Fatalf("Encountered error while getting list of releases\nError: %v\n", err)
+	}
+
+	recentVersions, err := lib.GetRecentVersions() //get recent versions from RECENT file
+	if err != nil {
+		log.Fatalf("Error while reading local versions file: %v\n", err)
+	}
+	tfReleases = append(recentVersions, tfReleases...)
+	tfReleases = lib.RemoveDuplicateVersions(tfReleases)
+
+	templates := promptui.SelectTemplates{
+		Active:   `{{ "»" | green | bold }} {{ .Version | green | bold }} {{ .LocalCacheTag | green | bold }}`,
+		Inactive: ` {{ .Version | cyan }} {{ .LocalCacheTag | green | bold }}`,
+		Selected: `{{ "»" | green | bold }} {{ .Version | green }} {{ .LocalCacheTag | green | bold }}`,
 	}
-	/* prompt user to select version of terraform */
 	prompt := promptui.Select{
-		Label: "Select Terraform version",
-		Items: tflist,
+		Label:     "Select Terraform version",
+		Items:     tfReleases,
+		Templates: &templates,
 	}
 
-	_, tfversion, errPrompt := prompt.Run()
-	tfversion = strings.Trim(tfversion, " *recent") //trim versions with the string " *recent" appended
+	i, _, errPrompt := prompt.Run()
+	release := tfReleases[i]
 
 	if errPrompt != nil {
-		log.Printf("Prompt failed %v\n", errPrompt)
-		os.Exit(1)
+		log.Fatalf("Prompt failed %v\n", errPrompt)
 	}
 
-	lib.Install(tfversion, *custBinPath, *mirrorURL)
+	lib.Install(release, *custBinPath)
 	os.Exit(0)
 }
 
 // install when tf file is provided
 func installTFProvidedModule(dir string, custBinPath, mirrorURL *string) {
 	fmt.Printf("Reading required version from terraform file\n")
-	module, _ := tfconfig.LoadModule(dir)
+	module, diag := tfconfig.LoadModule(dir)
+	if diag.Err() != nil {
+		log.Fatalf("Error loading Terraform module at: %s\nError: %v\n", dir, diag.Err())
+	}
 	tfconstraint := module.RequiredCore[0] //we skip duplicated definitions and use only first one
 	installFromConstraint(&tfconstraint, custBinPath, mirrorURL)
 }
@@ -436,13 +441,11 @@ func installTFProvidedModule(dir string, custBinPath, mirrorURL *string) {
 // install using a version constraint
 func installFromConstraint(tfconstraint *string, custBinPath, mirrorURL *string) {
 
-	tfversion, err := lib.GetSemver(tfconstraint, mirrorURL)
+	tfRelease, err := lib.GetSemver(tfconstraint, mirrorURL)
 	if err == nil {
-		lib.Install(tfversion, *custBinPath, *mirrorURL)
+		lib.Install(tfRelease, *custBinPath)
 	}
-	fmt.Println(err)
-	fmt.Println("No version found to match constraint. Follow the README.md instructions for setup. https://github.com/warrensbox/terraform-switcher/blob/master/README.md")
-	os.Exit(1)
+	log.Fatalf("No version found to match constraint. Follow the README.md instructions for setup. https://github.com/warrensbox/terraform-switcher/blob/master/README.md\nError: %s\n", err)
 }
 
 // Install using version constraint from terragrunt file
@@ -451,8 +454,7 @@ func installTGHclFile(tgFile *string, custBinPath, mirrorURL *string) {
 	parser := hclparse.NewParser()
 	file, diags := parser.ParseHCLFile(*tgFile) //use hcl parser to parse HCL file
 	if diags.HasErrors() {
-		fmt.Println("Unable to parse HCL file")
-		os.Exit(1)
+		log.Fatalf("Unable to parse HCL file: %q\n", diags.Error())
 	}
 	var version terragruntVersionConstraints
 	gohcl.DecodeBody(file.Body, nil, &version)
@@ -468,13 +470,9 @@ func checkVersionDefinedHCL(tgFile *string) bool {
 	parser := hclparse.NewParser()
 	file, diags := parser.ParseHCLFile(*tgFile) //use hcl parser to parse HCL file
 	if diags.HasErrors() {
-		fmt.Println("Unable to parse HCL file")
-		os.Exit(1)
+		log.Fatalf("Unable to parse HCL file: %q\n", diags.Error())
 	}
 	var version terragruntVersionConstraints
 	gohcl.DecodeBody(file.Body, nil, &version)
-	if version == (terragruntVersionConstraints{}) {
-		return false
-	}
-	return true
+	return version != (terragruntVersionConstraints{})
 }
diff --git a/version b/version
--- a/version
+++ b/version
@@ -1 +1 @@
-RELEASE_VERSION=0.13
\ No newline at end of file
+RELEASE_VERSION=0.14


Test patch:
diff --git a/lib/command_test.go b/lib/command_test.go
--- a/lib/command_test.go
+++ b/lib/command_test.go
@@ -34,10 +34,6 @@ func TestPathList(t *testing.T) {
 	}
 }
 
-type Command struct {
-	name string
-}
-
 // TestFind : check common "cd" command exist
 // This is assuming that Windows and linux has the "cd" command
 func TestFind(t *testing.T) {
diff --git a/lib/common_test.go b/lib/common_test.go
--- a/lib/common_test.go
+++ b/lib/common_test.go
@@ -9,10 +9,7 @@ import (
 
 func checkFileExist(file string) bool {
 	_, err := os.Stat(file)
-	if err != nil {
-		return false
-	}
-	return true
+	return err == nil
 }
 
 func createFile(path string) {
diff --git a/lib/files_test.go b/lib/files_test.go
--- a/lib/files_test.go
+++ b/lib/files_test.go
@@ -3,6 +3,7 @@ package lib_test
 import (
 	"bufio"
 	"bytes"
+	"encoding/json"
 	"fmt"
 	"io"
 	"log"
@@ -187,7 +188,13 @@ func TestWriteLines(t *testing.T) {
 	createDirIfNotExist(installLocation)
 
 	recentFilePath := filepath.Join(installLocation, recentFile)
-	test_array := []string{"0.1.1", "0.0.2", "0.0.3", "0.12.0-rc1", "0.12.0-beta1"}
+	var test_array = []*lib.Release{
+		NewRelease("0.1.1"),
+		NewRelease("0.0.2"),
+		NewRelease("0.0.3"),
+		NewRelease("0.12.0-rc1"),
+		NewRelease("0.12.0-beta1"),
+	}
 
 	errWrite := lib.WriteLines(test_array, recentFilePath)
 
@@ -200,7 +207,7 @@ func TestWriteLines(t *testing.T) {
 			part             []byte
 			prefix           bool
 			errOpen, errRead error
-			lines            []string
+			localReleases    []*lib.Release
 		)
 		if file, errOpen = os.Open(recentFilePath); errOpen != nil {
 			log.Fatal(errOpen)
@@ -214,7 +221,11 @@ func TestWriteLines(t *testing.T) {
 			}
 			buffer.Write(part)
 			if !prefix {
-				lines = append(lines, buffer.String())
+				var release *lib.Release
+				if err := json.Unmarshal(buffer.Bytes(), &release); err != nil {
+					log.Fatalf("%q: %s", err, buffer.Bytes())
+				}
+				localReleases = append(localReleases, release)
 				buffer.Reset()
 			}
 		}
@@ -226,9 +237,9 @@ func TestWriteLines(t *testing.T) {
 			log.Fatalf("Error: %s\n", errRead)
 		}
 
-		for _, line := range lines {
-			if !semverRegex.MatchString(line) {
-				log.Fatalf("Write to file is not invalid: %s\n", line)
+		for _, release := range localReleases {
+			if !semverRegex.MatchString(release.Version.String()) {
+				log.Fatalf("Write to file is not invalid: %v\n", release)
 				break
 			}
 		}
@@ -255,39 +266,32 @@ func TestReadLines(t *testing.T) {
 	createDirIfNotExist(installLocation)
 
 	recentFilePath := filepath.Join(installLocation, recentFile)
-	test_array := []string{"0.0.1", "0.0.2", "0.0.3", "0.12.0-rc1", "0.12.0-beta1"}
-
-	var (
-		file      *os.File
-		errCreate error
-	)
-
-	if file, errCreate = os.Create(recentFilePath); errCreate != nil {
-		log.Fatalf("Error: %s\n", errCreate)
+	var test_array = []*lib.Release{
+		NewRelease("0.1.1"),
+		NewRelease("0.0.2"),
+		NewRelease("0.0.3"),
+		NewRelease("0.12.0-rc1"),
+		NewRelease("0.12.0-beta1"),
 	}
-
-	for _, item := range test_array {
-		_, err := file.WriteString(strings.TrimSpace(item) + "\n")
-		if err != nil {
-			log.Fatalf("Error: %s\n", err)
-			break
-		}
+	err := lib.WriteLines(test_array, recentFilePath)
+	if err != nil {
+		log.Fatalf("Error writing releases: %q", err)
 	}
 
-	lines, errRead := lib.ReadLines(recentFilePath)
+	localReleases, errRead := lib.ReadLines(recentFilePath)
 
 	if errRead != nil {
-		log.Fatalf("Error: %s\n", errRead)
+		log.Fatalf("Error reading Releases from file: %s\n", errRead)
 	}
 
-	for _, line := range lines {
-		if !semverRegex.MatchString(line) {
-			log.Fatalf("Write to file is not invalid: %s\n", line)
+	for _, release := range localReleases {
+		if !semverRegex.MatchString(release.Version.String()) {
+			fmt.Println(release.Version)
+			log.Fatalf("Write to file is not invalid: %v\n", release)
 			break
 		}
 	}
 
-	file.Close()
 	t.Log("Read versions exist (expected)")
 
 	cleanUp(installLocation)
diff --git a/lib/list_versions_test.go b/lib/list_versions_test.go
--- a/lib/list_versions_test.go
+++ b/lib/list_versions_test.go
@@ -1,39 +1,65 @@
 package lib_test
 
 import (
+	"encoding/json"
+	"fmt"
 	"log"
 	"reflect"
 	"testing"
 
+	semver "github.com/hashicorp/go-version"
+
 	"github.com/warrensbox/terraform-switcher/lib"
 )
 
 const (
-	hashiURL = "https://releases.hashicorp.com/terraform/"
+	hashiURL = "https://api.releases.hashicorp.com/v1/releases/terraform"
 )
 
+// Used for constructing dummy release during tests
+func NewRelease(s string) *lib.Release {
+	v, err := semver.NewVersion(s)
+	if err != nil {
+		fmt.Println("Got here errorR")
+		log.Fatalln(err)
+	}
+	return &lib.Release{Version: v}
+}
+
 // TestGetTFList : Get list from hashicorp
-func TestGetTFList(t *testing.T) {
+
+func TestGetTFReleases(t *testing.T) {
 
 	listAll := true
-	list, _ := lib.GetTFList(hashiURL, listAll)
+	list, err := lib.GetTFReleases(hashiURL, listAll)
+	if err != nil {
+		log.Fatalln(err)
+	}
 
-	val := "0.1.0"
+	// Release metadata from https://releases.hashicorp.com/terraform/0.1.0
+	// All fields besides the 3 used in lib.Release have been stripped out
+	jSON := []byte(`{
+	  "builds":[{"arch":"amd64","os":"darwin","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_darwin_amd64.zip"},{"arch":"386","os":"linux","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_linux_386.zip"},{"arch":"amd64","os":"linux","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_linux_amd64.zip"},{"arch":"386","os":"windows","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_windows_386.zip"}],
+	  "timestamp_created": "2017-07-12T06:41:24.000Z",
+	  "version": "0.1.0"
+	}`)
+	var val lib.Release
+	if err := json.Unmarshal(jSON, &val); err != nil {
+		log.Fatalf("%s: %s", err, jSON)
+	}
 	var exists bool
 
 	switch reflect.TypeOf(list).Kind() {
 	case reflect.Slice:
 		s := reflect.ValueOf(list)
-
 		for i := 0; i < s.Len(); i++ {
-			if reflect.DeepEqual(val, s.Index(i).Interface()) == true {
+			if reflect.DeepEqual(&val, s.Index(i).Interface()) == true {
 				exists = true
 			}
 		}
 	}
-
 	if !exists {
-		log.Fatalf("Not able to find version: %s\n", val)
+		log.Fatalf("Not able to find Release version: %s\n", val.Version)
 	} else {
 		t.Log("Write versions exist (expected)")
 	}
@@ -43,12 +69,31 @@ func TestGetTFList(t *testing.T) {
 //TestRemoveDuplicateVersions :  test to removed duplicate
 func TestRemoveDuplicateVersions(t *testing.T) {
 
-	test_array := []string{"0.0.1", "0.0.2", "0.0.3", "0.0.1", "0.12.0-beta1", "0.12.0-beta1"}
+	jSON := []byte(`{
+	  "builds":[{"arch":"amd64","os":"darwin","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_darwin_amd64.zip"},{"arch":"386","os":"linux","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_linux_386.zip"},{"arch":"amd64","os":"linux","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_linux_amd64.zip"},{"arch":"386","os":"windows","url":"https://releases.hashicorp.com/terraform/0.1.0/terraform_0.1.0_windows_386.zip"}],
+	  "timestamp_created": "2017-07-12T06:41:24.000Z",
+	  "version": "0.1.0"
+	}`)
+	var val lib.Release
+	if err := json.Unmarshal(jSON, &val); err != nil {
+		log.Fatalf("%s: %s", err, jSON)
+	}
+
+	var test_array = []*lib.Release{
+		NewRelease("0.0.1"),
+		NewRelease("0.0.2"),
+		NewRelease("0.0.3"),
+		NewRelease("0.0.1"),
+		NewRelease("0.1.0"),
+		NewRelease("0.12.0-beta1"),
+		NewRelease("0.12.0-beta1"),
+	}
 
 	list := lib.RemoveDuplicateVersions(test_array)
 
 	if len(list) == len(test_array) {
-		log.Fatalf("Not able to remove duplicate: %s\n", test_array)
+		fmt.Println(test_array[0].Version.Equal(test_array[3].Version))
+		log.Fatalf("Not able to remove duplicate: %v\n", test_array)
 	} else {
 		t.Log("Write versions exist (expected)")
 	}
diff --git a/lib/semver_test.go b/lib/semver_test.go
--- a/lib/semver_test.go
+++ b/lib/semver_test.go
@@ -3,29 +3,38 @@ package lib_test
 import (
 	"testing"
 
+	semver "github.com/hashicorp/go-version"
+
 	"github.com/warrensbox/terraform-switcher/lib"
 )
 
-var versionsRaw = []string{
-	"1.1",
-	"1.2.1",
-	"1.2.2",
-	"1.2.3",
-	"1.3",
-	"1.1.4",
-	"0.7.1",
-	"1.4-beta",
-	"1.4",
-	"2"}
+var releasesRaw = []*lib.Release{
+	NewRelease("2"),
+	NewRelease("1.4-beta"),
+	NewRelease("1.4"),
+	NewRelease("1.3"),
+	NewRelease("1.2.3"),
+	NewRelease("1.2.2"),
+	NewRelease("1.2.1"),
+	NewRelease("1.1.4"),
+	NewRelease("1.1"),
+	NewRelease("0.7.1"),
+}
 
 // TestSemverParser1 : Test to see if SemVerParser parses valid version
 // Test version 1.1
 func TestSemverParserCase1(t *testing.T) {
-
 	tfconstraint := "1.1"
-	tfversion, _ := lib.SemVerParser(&tfconstraint, versionsRaw)
-	expected := "1.1.0"
-	if tfversion == expected {
+	tfversion, err := lib.SemVerParser(&tfconstraint, releasesRaw)
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	expected, err := semver.NewVersion("1.1.0")
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	if tfversion.Version.Equal(expected) {
+
 		t.Logf("Version exist in list %v [expected]", expected)
 	} else {
 		t.Logf("Version does not exist in list %v [unexpected]", tfconstraint)
@@ -36,11 +45,16 @@ func TestSemverParserCase1(t *testing.T) {
 // TestSemverParserCase2 : Test to see if SemVerParser parses valid version
 // Test version ~> 1.1 should return  1.1.4
 func TestSemverParserCase2(t *testing.T) {
-
 	tfconstraint := "~> 1.1.0"
-	tfversion, _ := lib.SemVerParser(&tfconstraint, versionsRaw)
-	expected := "1.1.4"
-	if tfversion == expected {
+	tfversion, err := lib.SemVerParser(&tfconstraint, releasesRaw)
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	expected, err := semver.NewVersion("1.1.4")
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	if tfversion.Version.Equal(expected) {
 		t.Logf("Version exist in list %v [expected]", expected)
 	} else {
 		t.Logf("Version does not exist in list %v [unexpected]", tfconstraint)
@@ -53,7 +67,7 @@ func TestSemverParserCase2(t *testing.T) {
 func TestSemverParserCase3(t *testing.T) {
 
 	tfconstraint := "~> 1.A.0"
-	_, err := lib.SemVerParser(&tfconstraint, versionsRaw)
+	_, err := lib.SemVerParser(&tfconstraint, releasesRaw)
 	if err != nil {
 		t.Logf("This test is suppose to error %v [expected]", tfconstraint)
 	} else {
@@ -66,9 +80,15 @@ func TestSemverParserCase3(t *testing.T) {
 func TestSemverParserCase4(t *testing.T) {
 
 	tfconstraint := ">= 1.0, < 1.4"
-	tfversion, _ := lib.SemVerParser(&tfconstraint, versionsRaw)
-	expected := "1.3.0"
-	if tfversion == expected {
+	tfversion, err := lib.SemVerParser(&tfconstraint, releasesRaw)
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	expected, err := semver.NewVersion("1.3.0")
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	if tfversion.Version.Equal(expected) {
 		t.Logf("Version exist in list %v [expected]", expected)
 	} else {
 		t.Logf("Version does not exist in list %v [unexpected]", tfconstraint)
@@ -81,9 +101,15 @@ func TestSemverParserCase4(t *testing.T) {
 func TestSemverParserCase5(t *testing.T) {
 
 	tfconstraint := ">= 1.0"
-	tfversion, _ := lib.SemVerParser(&tfconstraint, versionsRaw)
-	expected := "2.0.0"
-	if tfversion == expected {
+	tfversion, err := lib.SemVerParser(&tfconstraint, releasesRaw)
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	expected, err := semver.NewVersion("2.0.0")
+	if err != nil {
+		t.Fatalf("%q", err)
+	}
+	if tfversion.Version.Equal(expected) {
 		t.Logf("Version exist in list %v [expected]", expected)
 	} else {
 		t.Logf("Version does not exist in list %v [unexpected]", tfconstraint)