Repository: spf13/viper
Pull request #813 (2019-12-15 17:02:20)

Add support to save file with no extension
The suppport introduced for files with no file extension is only partial as trying to save the config file would fail with `<file name> equires valid extensio`
This adds support to saving such files

claassistantio: [![CLA assistant check](https://cla-assistant.io/pull/badge/not_signed)](https://cla-assistant.io/spf13/viper?pullRequest=813) <br/>Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our [Contributor License Agreement](https://cla-assistant.io/spf13/viper?pullRequest=813) before we can accept your contribution.<br/><sub>You have signed the CLA already but the status is still pending? Let us [recheck](https://cla-assistant.io/check/spf13/viper?pullRequest=813) it.</sub>
gssbzn: @sagikazarmark any chance to give this a look? it would be great to fully support config files with no extensions

Patch:
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..63afcbc
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.go]
+indent_style = tab
+
+[{Makefile, *.mk}]
+indent_style = tab
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 576e740..e4b85ea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,7 +11,6 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     strategy:
-      max-parallel: 10
       matrix:
         go: ['1.11', '1.12', '1.13']
     env:
@@ -26,7 +25,7 @@ jobs:
           go-version: ${{ matrix.go }}
 
       - name: Checkout code
-        uses: actions/checkout@v1
+        uses: actions/checkout@v2
 
       - name: Run tests
         run: make test
diff --git a/.gitignore b/.gitignore
index d6941f3..0007f97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,19 +2,3 @@
 /build/
 /var/
 /vendor/
-
-# IDE integration
-/.vscode/*
-!/.vscode/launch.json
-!/.vscode/tasks.json
-/.idea/*
-!/.idea/codeStyles/
-!/.idea/copyright/
-!/.idea/dataSources.xml
-!/.idea/*.iml
-!/.idea/externalDependencies.xml
-!/.idea/go.imports.xml
-!/.idea/modules.xml
-!/.idea/runConfigurations/
-!/.idea/scopes/
-!/.idea/sqldialects.xml
diff --git a/.golangci.yml b/.golangci.yml
index 0ea9249..a0755ce 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -21,4 +21,7 @@ linters:
         - scopelint
         - gocyclo
         - gocognit
-        - gocritic
\ No newline at end of file
+        - gocritic
+
+service:
+    golangci-lint-version: 1.21.x
diff --git a/.idea/externalDependencies.xml b/.idea/externalDependencies.xml
deleted file mode 100644
index 3ee9345..0000000
--- a/.idea/externalDependencies.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ExternalDependencies">
-    <plugin id="name.kropp.intellij.makefile" />
-    <plugin id="org.jetbrains.plugins.go" />
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/go.imports.xml b/.idea/go.imports.xml
deleted file mode 100644
index 560a90c..0000000
--- a/.idea/go.imports.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GoImports">
-    <option name="groupStdlibImports" value="true" />
-    <option name="importSorting" value="GOFMT" />
-    <option name="moveAllImportsInOneDeclaration" value="true" />
-  </component>
-</project>
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index 1a6ea8e..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/viper.iml" filepath="$PROJECT_DIR$/.idea/viper.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Check.xml b/.idea/runConfigurations/Check.xml
deleted file mode 100644
index 8477e06..0000000
--- a/.idea/runConfigurations/Check.xml
+++ /dev/null
@@ -1,7 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Check" type="CompoundRunConfigurationType">
-    <toRun name="Tests" type="GoTestRunConfiguration" />
-    <toRun name="Lint" type="MAKEFILE_TARGET_RUN_CONFIGURATION" />
-    <method v="2" />
-  </configuration>
-</component>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Lint.xml b/.idea/runConfigurations/Lint.xml
deleted file mode 100644
index 45aa432..0000000
--- a/.idea/runConfigurations/Lint.xml
+++ /dev/null
@@ -1,8 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Lint" type="MAKEFILE_TARGET_RUN_CONFIGURATION" factoryName="Makefile">
-    <makefile filename="$PROJECT_DIR$/Makefile" target="lint" workingDirectory="" arguments="">
-      <envs />
-    </makefile>
-    <method v="2" />
-  </configuration>
-</component>
\ No newline at end of file
diff --git a/.idea/viper.iml b/.idea/viper.iml
deleted file mode 100644
index 5e764c4..0000000
--- a/.idea/viper.iml
+++ /dev/null
@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<module type="WEB_MODULE" version="4">
-  <component name="Go" enabled="true" />
-  <component name="NewModuleRootManager">
-    <content url="file://$MODULE_DIR$" />
-    <orderEntry type="inheritedJdk" />
-    <orderEntry type="sourceFolder" forTests="false" />
-  </component>
-</module>
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ed677bb..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-go_import_path: github.com/spf13/viper
-
-language: go
-
-env:
-  global:
-    - GO111MODULE="on"
-    - GOFLAGS="-mod=readonly"
-
-go:
-  - 1.11.x
-  - 1.12.x
-  - 1.13.x
-  - tip
-
-os:
-  - linux
-  - osx
-
-matrix:
-  allow_failures:
-    - go: tip
-  fast_finish: true
-
-script:
-  - go install ./...
-  - diff -u <(echo -n) <(gofmt -d .)
-  - go test -v ./...
-
-after_success:
-  - go get -u -d github.com/spf13/hugo
-  - cd $GOPATH/src/github.com/spf13/hugo && make && ./hugo -s docs && cd -
diff --git a/Makefile b/Makefile
index e39b8b5..1c2cab0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,12 @@
 # A Self-Documenting Makefile: http://marmelab.com/blog/2016/02/29/auto-documented-makefile.html
 
 OS = $(shell uname | tr A-Z a-z)
+export PATH := $(abspath bin/):${PATH}
 
 # Build variables
 BUILD_DIR ?= build
+export CGO_ENABLED ?= 0
+export GOOS = $(shell go env GOOS)
 ifeq (${VERBOSE}, 1)
 ifeq ($(filter -v,${GOARGS}),)
 	GOARGS += -v
@@ -12,7 +15,7 @@ TEST_FORMAT = short-verbose
 endif
 
 # Dependency versions
-GOTESTSUM_VERSION = 0.3.5
+GOTESTSUM_VERSION = 0.4.0
 GOLANGCI_VERSION = 1.21.0
 
 # Add the ability to override some variables
@@ -33,20 +36,19 @@ bin/gotestsum-${GOTESTSUM_VERSION}:
 	curl -L https://github.com/gotestyourself/gotestsum/releases/download/v${GOTESTSUM_VERSION}/gotestsum_${GOTESTSUM_VERSION}_${OS}_amd64.tar.gz | tar -zOxf - gotestsum > ./bin/gotestsum-${GOTESTSUM_VERSION} && chmod +x ./bin/gotestsum-${GOTESTSUM_VERSION}
 
 TEST_PKGS ?= ./...
-TEST_REPORT_NAME ?= results.xml
 .PHONY: test
-test: TEST_REPORT ?= main
 test: TEST_FORMAT ?= short
 test: SHELL = /bin/bash
+test: export CGO_ENABLED=1
 test: bin/gotestsum ## Run tests
-	@mkdir -p ${BUILD_DIR}/test_results/${TEST_REPORT}
-	bin/gotestsum --no-summary=skipped --junitfile ${BUILD_DIR}/test_results/${TEST_REPORT}/${TEST_REPORT_NAME} --format ${TEST_FORMAT} -- $(filter-out -v,${GOARGS}) $(if ${TEST_PKGS},${TEST_PKGS},./...)
+	@mkdir -p ${BUILD_DIR}
+	bin/gotestsum --no-summary=skipped --junitfile ${BUILD_DIR}/coverage.xml --format ${TEST_FORMAT} -- -race -coverprofile=${BUILD_DIR}/coverage.txt -covermode=atomic $(filter-out -v,${GOARGS}) $(if ${TEST_PKGS},${TEST_PKGS},./...)
 
 bin/golangci-lint: bin/golangci-lint-${GOLANGCI_VERSION}
 	@ln -sf golangci-lint-${GOLANGCI_VERSION} bin/golangci-lint
 bin/golangci-lint-${GOLANGCI_VERSION}:
 	@mkdir -p bin
-	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | BINARY=golangci-lint bash -s -- v${GOLANGCI_VERSION}
+	curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b ./bin/ v${GOLANGCI_VERSION}
 	@mv bin/golangci-lint $@
 
 .PHONY: lint
@@ -57,6 +59,9 @@ lint: bin/golangci-lint ## Run linter
 fix: bin/golangci-lint ## Fix lint violations
 	bin/golangci-lint run --fix
 
+# Add custom targets here
+-include custom.mk
+
 .PHONY: list
 list: ## List all make targets
 	@${MAKE} -pRrn : -f $(MAKEFILE_LIST) 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | egrep -v -e '^[^[:alnum:]]' -e '^$@$$' | sort
diff --git a/README.md b/README.md
index 327308b..45e72f2 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,7 @@ where a configuration file is expected.
 
 ```go
 viper.SetConfigName("config") // name of config file (without extension)
+viper.SetConfigType("yaml") // REQUIRED if the config file does not have the extension in the name
 viper.AddConfigPath("/etc/appname/")   // path to look for the config file in
 viper.AddConfigPath("$HOME/.appname")  // call multiple times to add many search paths
 viper.AddConfigPath(".")               // optionally look for config in the working directory
@@ -124,7 +125,7 @@ if err := viper.ReadInConfig(); err != nil {
 // Config file found and successfully parsed
 ```
 
-*NOTE:* You can also have a file without an extension and specify the format programmaticaly. For those configuration files that lie in the home of the user without any extension like `.bashrc`
+*NOTE [since 1.6]:* You can also have a file without an extension and specify the format programmaticaly. For those configuration files that lie in the home of the user without any extension like `.bashrc`
 
 ### Writing Config Files
 
@@ -399,7 +400,7 @@ in a Key/Value store such as etcd or Consul.  These values take precedence over
 default values, but are overridden by configuration values retrieved from disk,
 flags, or environment variables.
 
-Viper uses [crypt](https://github.com/xordataexchange/crypt) to retrieve
+Viper uses [crypt](https://github.com/bketelsen/crypt) to retrieve
 configuration from the K/V store, which means that you can store your
 configuration values encrypted and have them automatically decrypted if you have
 the correct gpg keyring.  Encryption is optional.
@@ -411,7 +412,7 @@ independently of it.
 K/V store. `crypt` defaults to etcd on http://127.0.0.1:4001.
 
 ```bash
-$ go get github.com/xordataexchange/crypt/bin/crypt
+$ go get github.com/bketelsen/crypt/bin/crypt
 $ crypt set -plaintext /config/hugo.json /Users/hugo/settings/config.json
 ```
 
@@ -453,6 +454,16 @@ fmt.Println(viper.Get("port")) // 8080
 fmt.Println(viper.Get("hostname")) // myhostname.com
 ```
 
+#### Firestore
+
+```go
+viper.AddRemoteProvider("firestore", "google-cloud-project-id", "collection/document")
+viper.SetConfigType("json") // Config's format: "json", "toml", "yaml", "yml"
+err := viper.ReadRemoteConfig()
+```
+
+Of course, you're allowed to use `SecureRemoteProvider` also
+
 ### Remote Key/Value Store Example - Encrypted
 
 ```go
@@ -692,6 +703,37 @@ var C config
 v.Unmarshal(&C)
 ```
 
+Viper also supports unmarshaling into embedded structs:
+
+```go
+/*
+Example config:
+
+module:
+    enabled: true
+    token: 89h3f98hbwf987h3f98wenf89ehf
+*/
+type config struct {
+	Module struct {
+		Enabled bool
+
+		moduleConfig `mapstructure:",squash"`
+	}
+}
+
+// moduleConfig could be in a module specific package
+type moduleConfig struct {
+	Token string
+}
+
+var C config
+
+err := viper.Unmarshal(&C)
+if err != nil {
+	t.Fatalf("unable to decode into struct, %v", err)
+}
+```
+
 Viper uses [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default.
 
 ### Marshalling to string
diff --git a/go.mod b/go.mod
index 0e358cb..b7fbd36 100644
--- a/go.mod
+++ b/go.mod
@@ -3,17 +3,14 @@ module github.com/spf13/viper
 go 1.12
 
 require (
-	github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 // indirect
+	github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c
 	github.com/coreos/bbolt v1.3.2 // indirect
-	github.com/coreos/etcd v3.3.10+incompatible // indirect
-	github.com/coreos/go-semver v0.2.0 // indirect
 	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e // indirect
 	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/fsnotify/fsnotify v1.4.7
 	github.com/gogo/protobuf v1.2.1 // indirect
 	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
-	github.com/google/btree v1.0.0 // indirect
 	github.com/gorilla/websocket v1.4.0 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0 // indirect
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
@@ -30,19 +27,14 @@ require (
 	github.com/spf13/cast v1.3.0
 	github.com/spf13/jwalterweatherman v1.0.0
 	github.com/spf13/pflag v1.0.3
-	github.com/stretchr/testify v1.2.2
+	github.com/stretchr/testify v1.3.0
 	github.com/subosito/gotenv v1.2.0
 	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
-	github.com/ugorji/go v1.1.4 // indirect
 	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
-	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77
 	go.etcd.io/bbolt v1.3.2 // indirect
 	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
 	go.uber.org/zap v1.10.0 // indirect
-	golang.org/x/net v0.0.0-20190522155817-f3200d17e092 // indirect
-	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	google.golang.org/grpc v1.21.0 // indirect
 	gopkg.in/ini.v1 v1.51.0
 	gopkg.in/yaml.v2 v2.2.4
 )
diff --git a/go.sum b/go.sum
index d75aee2..f490ae9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,35 +1,62 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+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=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3 h1:AVXDdKsrtX33oR9fbCMu/+c1o8Ofjq6Ku/MInaLVg5Y=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1 h1:hL+ycaJpVE9M7nLoiXb/Pn10ENE2u+oddxbD8uu0ZVU=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0 h1:Kt+gOPPp2LEPWp8CSfxhsM8ik9CcyE/gYu+0r+RnZvM=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0 h1:9x7Bx0A9R5/M9jibeJeZWqjeVEIxYW9fZYqB9a70/bY=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1 h1:W9tAK3E57P75u0XLLR82LZyw8VpAnhmyTOxW9qzmyj8=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0 h1:VV2nUM3wwLLGh9lSABFgZMjInyUbJeaRSE64WuAIQ+4=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 h1:G1bPvciwNyF7IUmKXNt9Ak3m6u9DE1rF+RmtIkBpVdA=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c h1:+0HFd5KSZ/mm3JmhmrDukiId5iR6w4+BdFtfSy4yWIc=
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@@ -42,12 +69,27 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
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@@ -58,10 +100,46 @@ github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 h1:Ovs26xHkKqVztRpIrF/92Bcuy
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@@ -103,6 +202,10 @@ github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084 h1:sofwID9zm4tzr
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@@ -120,21 +223,23 @@ github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9
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@@ -142,46 +247,132 @@ go.uber.org/multierr v1.1.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/
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 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384 h1:TFlARGu6Czu1z7q93HTxcP1P+/ZFC/IKythI5RzrnRg=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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+golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
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+golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc h1:NCy3Ohtk6Iny5V/reW2Ktypo4zIpWBdRJ1uFMjBxdg8=
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+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
+google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
+google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
+google.golang.org/api v0.13.0 h1:Q3Ui3V3/CVinFWFiW39Iw0kMuVrRzYX0wN6OPFp0lTA=
+google.golang.org/api v0.13.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.6.1 h1:QzqyMA1tlu6CgqCDUtU9V+ZKhLFT2dkJuANu5QaxI3I=
+google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8 h1:Nw54tB0rB7hY/N0NQvRW8DG4Yk3Q6T9cu9RcFQDu1tc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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+google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
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+google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
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+google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.21.0 h1:G+97AoqBnmZIT91cLG/EkCoK9NSelj64P8bOHHNmGn0=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.1 h1:j6XxA85m/6txkUCHvzlV5f+HBNl/1r5cZ2A/3IEFOO8=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
@@ -190,3 +381,8 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
diff --git a/remote/remote.go b/remote/remote.go
index 6e8a534..6bdaa9a 100644
--- a/remote/remote.go
+++ b/remote/remote.go
@@ -13,7 +13,7 @@ import (
 
 	"github.com/spf13/viper"
 
-	crypt "github.com/xordataexchange/crypt/config"
+	crypt "github.com/bketelsen/crypt/config"
 )
 
 type remoteConfigProvider struct{}
@@ -82,15 +82,21 @@ func getConfigManager(rp viper.RemoteProvider) (crypt.ConfigManager, error) {
 			return nil, err
 		}
 		defer kr.Close()
-		if rp.Provider() == "etcd" {
+		switch rp.Provider() {
+		case "etcd":
 			cm, err = crypt.NewEtcdConfigManager([]string{rp.Endpoint()}, kr)
-		} else {
+		case "firestore":
+			cm, err = crypt.NewFirestoreConfigManager([]string{rp.Endpoint()}, kr)
+		default:
 			cm, err = crypt.NewConsulConfigManager([]string{rp.Endpoint()}, kr)
 		}
 	} else {
-		if rp.Provider() == "etcd" {
+		switch rp.Provider() {
+		case "etcd":
 			cm, err = crypt.NewStandardEtcdConfigManager([]string{rp.Endpoint()})
-		} else {
+		case "firestore":
+			cm, err = crypt.NewStandardFirestoreConfigManager([]string{rp.Endpoint()})
+		default:
 			cm, err = crypt.NewStandardConsulConfigManager([]string{rp.Endpoint()})
 		}
 	}
diff --git a/viper.go b/viper.go
index eb2f517..7b12b36 100644
--- a/viper.go
+++ b/viper.go
@@ -287,7 +287,7 @@ func NewWithOptions(opts ...Option) *Viper {
 func Reset() {
 	v = New()
 	SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "dotenv", "env", "ini"}
-	SupportedRemoteProviders = []string{"etcd", "consul"}
+	SupportedRemoteProviders = []string{"etcd", "consul", "firestore"}
 }
 
 type defaultRemoteProvider struct {
@@ -328,7 +328,7 @@ type RemoteProvider interface {
 var SupportedExts = []string{"json", "toml", "yaml", "yml", "properties", "props", "prop", "hcl", "dotenv", "env", "ini"}
 
 // SupportedRemoteProviders are universally supported remote providers.
-var SupportedRemoteProviders = []string{"etcd", "consul"}
+var SupportedRemoteProviders = []string{"etcd", "consul", "firestore"}
 
 func OnConfigChange(run func(in fsnotify.Event)) { v.OnConfigChange(run) }
 func (v *Viper) OnConfigChange(run func(in fsnotify.Event)) {
@@ -477,7 +477,7 @@ func (v *Viper) AddConfigPath(in string) {
 
 // AddRemoteProvider adds a remote configuration source.
 // Remote Providers are searched in the order they are added.
-// provider is a string value, "etcd" or "consul" are currently supported.
+// provider is a string value: "etcd", "consul" or "firestore" are currently supported.
 // endpoint is the url.  etcd requires http://ip:port  consul requires ip:port
 // path is the path in the k/v store to retrieve configuration
 // To retrieve a config file called myapp.json from /configs/myapp.json
@@ -506,14 +506,14 @@ func (v *Viper) AddRemoteProvider(provider, endpoint, path string) error {
 
 // AddSecureRemoteProvider adds a remote configuration source.
 // Secure Remote Providers are searched in the order they are added.
-// provider is a string value, "etcd" or "consul" are currently supported.
+// provider is a string value: "etcd", "consul" or "firestore" are currently supported.
 // endpoint is the url.  etcd requires http://ip:port  consul requires ip:port
 // secretkeyring is the filepath to your openpgp secret keyring.  e.g. /etc/secrets/myring.gpg
 // path is the path in the k/v store to retrieve configuration
 // To retrieve a config file called myapp.json from /configs/myapp.json
 // you should set path to /configs and set config name (SetConfigName()) to
 // "myapp"
-// Secure Remote Providers are implemented with github.com/xordataexchange/crypt
+// Secure Remote Providers are implemented with github.com/bketelsen/crypt
 func AddSecureRemoteProvider(provider, endpoint, path, secretkeyring string) error {
 	return v.AddSecureRemoteProvider(provider, endpoint, path, secretkeyring)
 }
@@ -996,11 +996,6 @@ func (v *Viper) BindFlagValues(flags FlagValueSet) (err error) {
 }
 
 // BindFlagValue binds a specific key to a FlagValue.
-// Example (where serverCmd is a Cobra instance):
-//
-//	 serverCmd.Flags().Int("port", 1138, "Port to run Application server on")
-//	 Viper.BindFlagValue("port", serverCmd.Flags().Lookup("port"))
-//
 func BindFlagValue(key string, flag FlagValue) error { return v.BindFlagValue(key, flag) }
 func (v *Viper) BindFlagValue(key string, flag FlagValue) error {
 	if flag == nil {
@@ -1418,11 +1413,18 @@ func (v *Viper) SafeWriteConfigAs(filename string) error {
 
 func (v *Viper) writeConfig(filename string, force bool) error {
 	jww.INFO.Println("Attempting to write configuration to file.")
+	var configType string
+
 	ext := filepath.Ext(filename)
-	if len(ext) <= 1 {
-		return fmt.Errorf("filename: %s requires valid extension", filename)
+	if ext != "" {
+		configType = ext[1:]
+	} else {
+		configType = v.configType
+	}
+	if configType == "" {
+		return fmt.Errorf("config type could not be determined for %s", filename)
 	}
-	configType := ext[1:]
+
 	if !stringInSlice(configType, SupportedExts) {
 		return UnsupportedConfigError(configType)
 	}
@@ -1976,8 +1978,10 @@ func (v *Viper) searchInPath(in string) (filename string) {
 		}
 	}
 
-	if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
-		return filepath.Join(in, v.configName)
+	if v.configType != "" {
+		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {
+			return filepath.Join(in, v.configName)
+		}
 	}
 
 	return ""


Test patch:
diff --git a/.idea/runConfigurations/Tests.xml b/.idea/runConfigurations/Tests.xml
deleted file mode 100644
index f5b3013..0000000
--- a/.idea/runConfigurations/Tests.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Tests" type="GoTestRunConfiguration" factoryName="Go Test">
-    <module name="viper" />
-    <working_directory value="$PROJECT_DIR$/" />
-    <go_parameters value="-i" />
-    <EXTENSION ID="net.ashald.envfile">
-      <option name="IS_ENABLED" value="false" />
-      <option name="IS_SUBST" value="false" />
-      <option name="IS_PATH_MACRO_SUPPORTED" value="false" />
-      <option name="IS_IGNORE_MISSING_FILES" value="false" />
-      <option name="IS_ENABLE_EXPERIMENTAL_INTEGRATIONS" value="false" />
-      <ENTRIES>
-        <ENTRY IS_ENABLED="true" PARSER="runconfig" />
-      </ENTRIES>
-    </EXTENSION>
-    <framework value="gotest" />
-    <kind value="DIRECTORY" />
-    <package value="github.com/spf13/viper" />
-    <directory value="$PROJECT_DIR$/" />
-    <filePath value="$PROJECT_DIR$/" />
-    <method v="2" />
-  </configuration>
-</component>
\ No newline at end of file
diff --git a/viper_test.go b/viper_test.go
index fcd1b0e..b8ceccb 100644
--- a/viper_test.go
+++ b/viper_test.go
@@ -307,11 +307,29 @@ func TestBasics(t *testing.T) {
 	assert.NoError(t, err)
 }
 
+func TestSearchInPath_WithoutConfigTypeSet(t *testing.T) {
+	filename := ".dotfilenoext"
+	path := "/tmp"
+	file := filepath.Join(path, filename)
+	SetConfigName(filename)
+	AddConfigPath(path)
+	_, createErr := v.fs.Create(file)
+	defer func() {
+		_ = v.fs.Remove(file)
+	}()
+	assert.NoError(t, createErr)
+	_, err := v.getConfigFile()
+	// unless config type is set, files without extension
+	// are not considered
+	assert.Error(t, err)
+}
+
 func TestSearchInPath(t *testing.T) {
 	filename := ".dotfilenoext"
 	path := "/tmp"
 	file := filepath.Join(path, filename)
 	SetConfigName(filename)
+	SetConfigType("yaml")
 	AddConfigPath(path)
 	_, createErr := v.fs.Create(file)
 	defer func() {
@@ -1261,26 +1279,6 @@ var hclWriteExpected = []byte(`"foos" = {
 
 "type" = "donut"`)
 
-func TestWriteConfigHCL(t *testing.T) {
-	v := New()
-	fs := afero.NewMemMapFs()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("hcl")
-	err := v.ReadConfig(bytes.NewBuffer(hclExample))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := v.WriteConfigAs("c.hcl"); err != nil {
-		t.Fatal(err)
-	}
-	read, err := afero.ReadFile(fs, "c.hcl")
-	if err != nil {
-		t.Fatal(err)
-	}
-	assert.Equal(t, hclWriteExpected, read)
-}
-
 var jsonWriteExpected = []byte(`{
   "batters": {
     "batter": [
@@ -1304,26 +1302,6 @@ var jsonWriteExpected = []byte(`{
   "type": "donut"
 }`)
 
-func TestWriteConfigJson(t *testing.T) {
-	v := New()
-	fs := afero.NewMemMapFs()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("json")
-	err := v.ReadConfig(bytes.NewBuffer(jsonExample))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := v.WriteConfigAs("c.json"); err != nil {
-		t.Fatal(err)
-	}
-	read, err := afero.ReadFile(fs, "c.json")
-	if err != nil {
-		t.Fatal(err)
-	}
-	assert.Equal(t, jsonWriteExpected, read)
-}
-
 var propertiesWriteExpected = []byte(`p_id = 0001
 p_type = donut
 p_name = Cake
@@ -1331,95 +1309,6 @@ p_ppu = 0.55
 p_batters.batter.type = Regular
 `)
 
-func TestWriteConfigProperties(t *testing.T) {
-	v := New()
-	fs := afero.NewMemMapFs()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("properties")
-	err := v.ReadConfig(bytes.NewBuffer(propertiesExample))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := v.WriteConfigAs("c.properties"); err != nil {
-		t.Fatal(err)
-	}
-	read, err := afero.ReadFile(fs, "c.properties")
-	if err != nil {
-		t.Fatal(err)
-	}
-	assert.Equal(t, propertiesWriteExpected, read)
-}
-
-func TestWriteConfigTOML(t *testing.T) {
-	fs := afero.NewMemMapFs()
-	v := New()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("toml")
-	err := v.ReadConfig(bytes.NewBuffer(tomlExample))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := v.WriteConfigAs("c.toml"); err != nil {
-		t.Fatal(err)
-	}
-
-	// The TOML String method does not order the contents.
-	// Therefore, we must read the generated file and compare the data.
-	v2 := New()
-	v2.SetFs(fs)
-	v2.SetConfigName("c")
-	v2.SetConfigType("toml")
-	v2.SetConfigFile("c.toml")
-	err = v2.ReadInConfig()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	assert.Equal(t, v.GetString("title"), v2.GetString("title"))
-	assert.Equal(t, v.GetString("owner.bio"), v2.GetString("owner.bio"))
-	assert.Equal(t, v.GetString("owner.dob"), v2.GetString("owner.dob"))
-	assert.Equal(t, v.GetString("owner.organization"), v2.GetString("owner.organization"))
-}
-
-var dotenvWriteExpected = []byte(`
-TITLE="DotEnv Write Example"
-NAME=Oreo
-KIND=Biscuit
-`)
-
-func TestWriteConfigDotEnv(t *testing.T) {
-	fs := afero.NewMemMapFs()
-	v := New()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("env")
-	err := v.ReadConfig(bytes.NewBuffer(dotenvWriteExpected))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := v.WriteConfigAs("c.env"); err != nil {
-		t.Fatal(err)
-	}
-
-	// The TOML String method does not order the contents.
-	// Therefore, we must read the generated file and compare the data.
-	v2 := New()
-	v2.SetFs(fs)
-	v2.SetConfigName("c")
-	v2.SetConfigType("env")
-	v2.SetConfigFile("c.env")
-	err = v2.ReadInConfig()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	assert.Equal(t, v.GetString("title"), v2.GetString("title"))
-	assert.Equal(t, v.GetString("type"), v2.GetString("type"))
-	assert.Equal(t, v.GetString("kind"), v2.GetString("kind"))
-}
-
 var yamlWriteExpected = []byte(`age: 35
 beard: true
 clothing:
@@ -1436,24 +1325,237 @@ hobbies:
 name: steve
 `)
 
-func TestWriteConfigYAML(t *testing.T) {
-	v := New()
+func TestWriteConfig(t *testing.T) {
 	fs := afero.NewMemMapFs()
-	v.SetFs(fs)
-	v.SetConfigName("c")
-	v.SetConfigType("yaml")
-	err := v.ReadConfig(bytes.NewBuffer(yamlExample))
-	if err != nil {
-		t.Fatal(err)
+	testCases := map[string]struct {
+		configName      string
+		inConfigType    string
+		outConfigType   string
+		fileName        string
+		input           []byte
+		expectedContent []byte
+	}{
+		"hcl with file extension": {
+			configName:      "c",
+			inConfigType:    "hcl",
+			outConfigType:   "hcl",
+			fileName:        "c.hcl",
+			input:           hclExample,
+			expectedContent: hclWriteExpected,
+		},
+		"hcl without file extension": {
+			configName:      "c",
+			inConfigType:    "hcl",
+			outConfigType:   "hcl",
+			fileName:        "c",
+			input:           hclExample,
+			expectedContent: hclWriteExpected,
+		},
+		"hcl with file extension and mismatch type": {
+			configName:      "c",
+			inConfigType:    "hcl",
+			outConfigType:   "json",
+			fileName:        "c.hcl",
+			input:           hclExample,
+			expectedContent: hclWriteExpected,
+		},
+		"json with file extension": {
+			configName:      "c",
+			inConfigType:    "json",
+			outConfigType:   "json",
+			fileName:        "c.json",
+			input:           jsonExample,
+			expectedContent: jsonWriteExpected,
+		},
+		"json without file extension": {
+			configName:      "c",
+			inConfigType:    "json",
+			outConfigType:   "json",
+			fileName:        "c",
+			input:           jsonExample,
+			expectedContent: jsonWriteExpected,
+		},
+		"json with file extension and mismatch type": {
+			configName:      "c",
+			inConfigType:    "json",
+			outConfigType:   "hcl",
+			fileName:        "c.json",
+			input:           jsonExample,
+			expectedContent: jsonWriteExpected,
+		},
+		"properties with file extension": {
+			configName:      "c",
+			inConfigType:    "properties",
+			outConfigType:   "properties",
+			fileName:        "c.properties",
+			input:           propertiesExample,
+			expectedContent: propertiesWriteExpected,
+		},
+		"properties without file extension": {
+			configName:      "c",
+			inConfigType:    "properties",
+			outConfigType:   "properties",
+			fileName:        "c",
+			input:           propertiesExample,
+			expectedContent: propertiesWriteExpected,
+		},
+		"yaml with file extension": {
+			configName:      "c",
+			inConfigType:    "yaml",
+			outConfigType:   "yaml",
+			fileName:        "c.yaml",
+			input:           yamlExample,
+			expectedContent: yamlWriteExpected,
+		},
+		"yaml without file extension": {
+			configName:      "c",
+			inConfigType:    "yaml",
+			outConfigType:   "yaml",
+			fileName:        "c",
+			input:           yamlExample,
+			expectedContent: yamlWriteExpected,
+		},
+		"yaml with file extension and mismatch type": {
+			configName:      "c",
+			inConfigType:    "yaml",
+			outConfigType:   "json",
+			fileName:        "c.yaml",
+			input:           yamlExample,
+			expectedContent: yamlWriteExpected,
+		},
 	}
-	if err := v.WriteConfigAs("c.yaml"); err != nil {
-		t.Fatal(err)
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			v := New()
+			v.SetFs(fs)
+			v.SetConfigName(tc.fileName)
+			v.SetConfigType(tc.inConfigType)
+
+			err := v.ReadConfig(bytes.NewBuffer(tc.input))
+			if err != nil {
+				t.Fatal(err)
+			}
+			v.SetConfigType(tc.outConfigType)
+			if err := v.WriteConfigAs(tc.fileName); err != nil {
+				t.Fatal(err)
+			}
+			read, err := afero.ReadFile(fs, tc.fileName)
+			if err != nil {
+				t.Fatal(err)
+			}
+			assert.Equal(t, tc.expectedContent, read)
+		})
 	}
-	read, err := afero.ReadFile(fs, "c.yaml")
-	if err != nil {
-		t.Fatal(err)
+}
+
+func TestWriteConfigTOML(t *testing.T) {
+	fs := afero.NewMemMapFs()
+
+	testCases := map[string]struct {
+		configName string
+		configType string
+		fileName   string
+		input      []byte
+	}{
+		"with file extension": {
+			configName: "c",
+			configType: "toml",
+			fileName:   "c.toml",
+			input:      tomlExample,
+		},
+		"without file extension": {
+			configName: "c",
+			configType: "toml",
+			fileName:   "c",
+			input:      tomlExample,
+		},
+	}
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			v := New()
+			v.SetFs(fs)
+			v.SetConfigName(tc.configName)
+			v.SetConfigType(tc.configType)
+			err := v.ReadConfig(bytes.NewBuffer(tc.input))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if err := v.WriteConfigAs(tc.fileName); err != nil {
+				t.Fatal(err)
+			}
+
+			// The TOML String method does not order the contents.
+			// Therefore, we must read the generated file and compare the data.
+			v2 := New()
+			v2.SetFs(fs)
+			v2.SetConfigName(tc.configName)
+			v2.SetConfigType(tc.configType)
+			v2.SetConfigFile(tc.fileName)
+			err = v2.ReadInConfig()
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			assert.Equal(t, v.GetString("title"), v2.GetString("title"))
+			assert.Equal(t, v.GetString("owner.bio"), v2.GetString("owner.bio"))
+			assert.Equal(t, v.GetString("owner.dob"), v2.GetString("owner.dob"))
+			assert.Equal(t, v.GetString("owner.organization"), v2.GetString("owner.organization"))
+		})
+	}
+}
+
+func TestWriteConfigDotEnv(t *testing.T) {
+	fs := afero.NewMemMapFs()
+	testCases := map[string]struct {
+		configName string
+		configType string
+		fileName   string
+		input      []byte
+	}{
+		"with file extension": {
+			configName: "c",
+			configType: "env",
+			fileName:   "c.env",
+			input:      dotenvExample,
+		},
+		"without file extension": {
+			configName: "c",
+			configType: "env",
+			fileName:   "c",
+			input:      dotenvExample,
+		},
+	}
+	for name, tc := range testCases {
+		t.Run(name, func(t *testing.T) {
+			v := New()
+			v.SetFs(fs)
+			v.SetConfigName(tc.configName)
+			v.SetConfigType(tc.configType)
+			err := v.ReadConfig(bytes.NewBuffer(tc.input))
+			if err != nil {
+				t.Fatal(err)
+			}
+			if err := v.WriteConfigAs(tc.fileName); err != nil {
+				t.Fatal(err)
+			}
+
+			// The TOML String method does not order the contents.
+			// Therefore, we must read the generated file and compare the data.
+			v2 := New()
+			v2.SetFs(fs)
+			v2.SetConfigName(tc.configName)
+			v2.SetConfigType(tc.configType)
+			v2.SetConfigFile(tc.fileName)
+			err = v2.ReadInConfig()
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			assert.Equal(t, v.GetString("title_dotenv"), v2.GetString("title_dotenv"))
+			assert.Equal(t, v.GetString("type_dotenv"), v2.GetString("type_dotenv"))
+			assert.Equal(t, v.GetString("kind_dotenv"), v2.GetString("kind_dotenv"))
+		})
 	}
-	assert.Equal(t, yamlWriteExpected, read)
 }
 
 func TestSafeWriteConfig(t *testing.T) {