Repository: nvm
Issue: `nvm current` returns blank/nothing on Windows w/ Git Bash environment
Labels: OS: windows,pull request wanted

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#### Operating system and version: 
Windows 10, nvm version 0.39.1

#### `nvm debug` output:
<details>
<!-- do not delete the following blank line -->

```sh
$ nvm debug
nvm --version: v0.39.1
$SHELL: /usr/bin/bash
$SHLVL: 1
whoami: 'jschilling'
${HOME}: /c/Users/jschilling
${NVM_DIR}: '${HOME}/.nvm'
${PATH}: ${HOME}/bin:/mingw64/bin:/usr/local/bin:/usr/bin:/bin:/mingw64/bin:/usr/bin:${HOME}/bin:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0:/c/Windows/System32/OpenSSH:/c/Program Files (x86)/Microsoft SQL Server/150/DTS/Binn:/c/Program Files/Azure Data Studio/bin:/c/Program Files/dotnet:/c/Windows/system32/config/systemprofile/.dnx/bin:/c/Program Files/Microsoft DNX/Dnvm:/c/Program Files/Microsoft SQL Server/130/Tools/Binn:/c/Program Files/Microsoft/Web Platform Installer:/c/Program Files/NVIDIA Corporation/NVIDIA NvDLISR:/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common:/cmd:${HOME}/AppData/Local/Programs/Microsoft VS Code/bin:${HOME}/AppData/Local/.meteor:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/meteor/node_modules/.bin:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/.bin:${NVM_DIR}/versions/node/v12.19.1/bin:${HOME}/bin:/mingw64/bin:/usr/local/bin:/usr/bin:/usr/bin:/mingw64/bin:/usr/bin:${HOME}/bin:${HOME}/.dnx/bin:/c/Program Files/Microsoft SQL Server/130/Tools:/usr/bin/vendor_perl:/usr/bin/core_perl
$PREFIX: ''
${NPM_CONFIG_PREFIX}: ''
$NVM_NODEJS_ORG_MIRROR: ''
$NVM_IOJS_ORG_MIRROR: ''
shell version: 'GNU bash, version 5.2.15(1)-release (x86_64-pc-msys)'
uname -a: 'MINGW64_NT-10.0-19045 3.4.7-ea781829.x86_64 2023-07-05 12:05 UTC x86_64 Msys'
checksum binary: 'sha256sum'
curl: /mingw64/bin/curl, curl 8.1.2 (x86_64-w64-mingw32) libcurl/8.1.2 Schannel zlib/1.2.13 brotli/1.0.9 zstd/1.5.5 libidn2/2.3.4 libpsl/0.21.2 (+libidn2/2.3.3) libssh2/1.11.0
wget: not found
git: /mingw64/bin/git, git version 2.41.0.windows.3
grep: /usr/bin/grep, grep (GNU grep) 3.0
awk: /usr/bin/awk, GNU Awk 5.0.0, API: 2.0 (GNU MPFR 4.2.0-p9, GNU MP 6.2.1)
sed: /usr/bin/sed, sed (GNU sed) 4.9
cut: /usr/bin/cut, cut (GNU coreutils) 8.32
basename: /usr/bin/basename, basename (GNU coreutils) 8.32
rm: /usr/bin/rm, rm (GNU coreutils) 8.32
mkdir: /usr/bin/mkdir, mkdir (GNU coreutils) 8.32
xargs: /usr/bin/xargs, xargs (GNU findutils) 4.9.0
nvm current:
which node: ${NVM_DIR}/versions/node/v12.19.1/bin/node
which iojs: which: no iojs in (${HOME}/bin:/mingw64/bin:/usr/local/bin:/usr/bin:/bin:/mingw64/bin:/usr/bin:${HOME}/bin:/c/Windows/system32:/c/Windows:/c/Windows/System32/Wbem:/c/Windows/System32/WindowsPowerShell/v1.0:/c/Windows/System32/OpenSSH:/c/Program Files (x86)/Microsoft SQL Server/150/DTS/Binn:/c/Program Files/Azure Data Studio/bin:/c/Program Files/dotnet:/c/Windows/system32/config/systemprofile/.dnx/bin:/c/Program Files/Microsoft DNX/Dnvm:/c/Program Files/Microsoft SQL Server/130/Tools/Binn:/c/Program Files/Microsoft/Web Platform Installer:/c/Program Files/NVIDIA Corporation/NVIDIA NvDLISR:/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common:/cmd:${HOME}/AppData/Local/Programs/Microsoft VS Code/bin:${HOME}/AppData/Local/.meteor:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/npm/node_modules/npm-lifecycle/node-gyp-bin:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/meteor/node_modules/.bin:${NVM_DIR}/versions/node/v12.19.1/bin/node_modules/.bin:${NVM_DIR}/versions/node/v12.19.1/bin:${HOME}/bin:/mingw64/bin:/usr/local/bin:/usr/bin:/usr/bin:/mingw64/bin:/usr/bin:${HOME}/bin:${HOME}/.dnx/bin:/c/Program Files/Microsoft SQL Server/130/Tools:/usr/bin/vendor_perl:/usr/bin/core_perl)
which npm: ${NVM_DIR}/versions/node/v12.19.1/bin/npm
npm config get prefix: C:\Users\jschilling\.nvm\versions\node\v12.19.1\bin
npm root -g: C:\Users\jschilling\.nvm\versions\node\v12.19.1\bin\node_modules
```
</details>

#### `nvm ls` output:
<details>
<!-- do not delete the following blank line -->

```sh
$ nvm ls
       v12.19.1
       v12.20.2
       v16.17.0
       v18.13.0
         system
default -> 18.13.0 (-> v18.13.0)
iojs -> N/A (default)
unstable -> N/A (default)
node -> stable (-> v18.13.0) (default)
stable -> 18.13 (-> v18.13.0) (default)
lts/* -> lts/hydrogen (-> N/A)
lts/argon -> v4.9.1 (-> N/A)
lts/boron -> v6.17.1 (-> N/A)
lts/carbon -> v8.17.0 (-> N/A)
lts/dubnium -> v10.24.1 (-> N/A)
lts/erbium -> v12.22.12 (-> N/A)
lts/fermium -> v14.21.3 (-> N/A)
lts/gallium -> v16.20.0 (-> N/A)
lts/hydrogen -> v18.16.0 (-> N/A)
```
</details>

#### How did you install `nvm`?
<!-- (e.g. install script in readme, Homebrew) -->
From the install script in the readme

#### What steps did you perform?
- Installed nvm
- Added a .nvmrc file to our projects
- Installed the required versions of Node with nvm for each of our projects
- We have been using nvm for a long time now with little to no issue across our Windows and MacOS environments

#### What happened?
Nvm and the node versions installed as expected, however running the `nvm current` command returns nothing/blank in a Windows 10 & Git Bash environment. It even returns blank in the `nvm debug` results posted above.

Also `nvm list` and `nvm ls` don't notate the currently selected version of Node from the list of installed versions.

#### What did you expect to happen?
Similar to how it operates in our MacOS environments, I would expect `nvm current` to show the currently selected Node version and `nvm list` and `nvm ls` to notate the currently selected Node version from the list of installed versions.

#### Is there anything in any of your profile files that modifies the `PATH`?
<!--  (e.g. `.bashrc`, `.bash_profile`, `.zshrc`, etc) -->
Not that I can see. The `.bashrc` file alters the NVM_DIR variable and exports it but that is all.