Add support for update-git-for-windows command on supported Git versions

src/CheckRequirements.ps1

@@ -1,18 +1,20 @@
-$Global:GitMissing = $false
+$global:GitMissing = $false
+
+$requiredVersion = [Version]'1.7.2'
+$script:GitVersion = $requiredVersion
 
 if (!(Get-Command git -TotalCount 1 -ErrorAction SilentlyContinue)) {
     Write-Warning "git command could not be found. Please create an alias or add it to your PATH."
     $Global:GitMissing = $true
     return
 }
 
-$requiredVersion = [Version]'1.7.2'
 if ([string](git --version 2> $null) -match '(?<ver>\d+(?:\.\d+)+)') {
-    $version = [Version]$Matches['ver']
+    $script:GitVersion = [System.Version]$Matches['ver']
 }
 
-if ($version -lt $requiredVersion) {
-    Write-Warning "posh-git requires Git $requiredVersion or better. You have $version."
+if ($GitVersion -lt $requiredVersion) {
+    Write-Warning "posh-git requires Git $requiredVersion or better. You have $GitVersion."
     $false
 }
 else {

src/GitTabExpansion.ps1

@@ -57,6 +57,10 @@ $script:someCommands = @('add','am','annotate','archive','bisect','blame','branc
                          'notes','prune','pull','push','rebase','reflog','remote','rerere','reset','revert','rm',
                          'shortlog','show','stash','status','submodule','svn','tag','whatchanged', 'worktree')
 
+if ((($PSVersionTable.PSVersion.Major -eq 5) -or $IsWindows) -and ($script:GitVersion -ge [System.Version]'2.16.2')) {
+    $script:someCommands += 'update-git-for-windows'
+}
+
 $script:gitCommandsWithLongParams = $longGitParams.Keys -join '|'
 $script:gitCommandsWithShortParams = $shortGitParams.Keys -join '|'
 $script:gitCommandsWithParamValues = $gitParamValues.Keys -join '|'

src/posh-git.psm1

@@ -1,6 +1,6 @@
 param([switch]$NoVersionWarn, [switch]$ForcePoshGitPrompt)
 
-& $PSScriptRoot\CheckRequirements.ps1 > $null
+. $PSScriptRoot\CheckRequirements.ps1 > $null
 
 . $PSScriptRoot\ConsoleMode.ps1
 . $PSScriptRoot\Utils.ps1

test/Shared.ps1

@@ -21,7 +21,7 @@ function global:git {
     $cmdline = "$args"
     # Write-Warning "in global git func with: $cmdline"
     switch ($cmdline) {
-        '--version' { 'git version 2.11.0.windows.1' }
+        '--version' { 'git version 2.16.2.windows.1' }
         'help'      { Get-Content $PSScriptRoot\git-help.txt  }
         default     {
             $res = Invoke-Expression "&$gitbin $cmdline"

test/TabExpansion.Tests.ps1

@@ -37,6 +37,17 @@ Describe 'TabExpansion Tests' {
             $result2 -contains 'set-head' | Should Be $true
             $result2 -contains 'set-url' | Should Be $true
         }
+        It 'Tab completes update-git-for-windows only on Windows' {
+            $result = & $module GitTabExpansionInternal 'git update-'
+
+            if ((($PSVersionTable.PSVersion.Major -eq 5) -or $IsWindows)) {
+                $result -contains '' | Should Be $false
+                $result -contains 'update-git-for-windows' | Should Be $true
+            }
+            else {
+                $result | Should BeNullOrEmpty
+            }
+        }
     }
     Context 'Fetch/Push/Pull TabExpansion Tests' {
         BeforeEach {