git stage/restore keyboard shortcuts (kelleyma49#168)

* Initial version of git add/reset in status

- keyboard shortcuts for adding/reseting changes, similar to git fuzzy

* git stage/restore work

- staged files show diff
- print if file was added/deleted in preview window

PSFzf.Git.ps1

@@ -100,12 +100,28 @@ function Invoke-PsFzfGitFiles() {
 
     $headerStrings = Get-HeaderStrings
 
+    # add git add and reset keyboard shortcuts:
+    if ($RunningInWindowsTerminal -or -not $IsWindowsCheck) {
+        $gitCmdsHeader = "`n`e[7mALT+S`e[0m Git Add`t`e[7mALT+R`e[0m Git Reset"
+    } else {
+        $gitCmdsHeader = "`nALT+S-Git Stage`tALT+R-Git Reset"
+    }
+    $headerStr = $headerStrings[0] + $gitCmdsHeader
     $statusCmd = "git $(Get-ColorAlways '-c color.status=always') status --short"
+
+    $reloadBindCmd = "reload($statusCmd)"
+    $stageScriptPath = Join-Path $PsScriptRoot 'helpers/PsFzfGitFiles-GitAdd.sh'
+    $gitStageBind = "alt-s:execute-silent(" + "${script:bashPath} ${stageScriptPath} {+2..})+down+${reloadBindCmd}"
+    $resetScriptPath = Join-Path $PsScriptRoot 'helpers/PsFzfGitFiles-GitReset.sh'
+    $gitResetBind = "alt-r:execute-silent(" + "${script:bashPath} ${resetScriptPath} {+2..})+down+${reloadBindCmd}"
+
     Invoke-Expression "& $statusCmd" | `
         Invoke-Fzf -Multi -Ansi `
-        -Preview "$previewCmd" -Header $headerStrings[0] -Bind $headerStrings[1] | foreach-object {
-        $result += $_.Substring('?? '.Length)
-    }
+        -Preview "$previewCmd" -Header $headerStr `
+        -Bind $headerStrings[1],"""$gitStageBind""","""$gitResetBind""" | `
+        foreach-object {
+            $result += $_.Substring('?? '.Length)
+        }
     InvokePromptHack
     if ($result.Length -gt 0) {
         $result = $result -join " "

helpers/PsFzfGitFiles-GitAdd.sh

@@ -0,0 +1 @@
+ git add -- "$@"

helpers/PsFzfGitFiles-GitReset.sh

@@ -0,0 +1 @@
+ git reset -- "$@"

helpers/PsFzfGitFiles-Preview.sh

@@ -5,5 +5,11 @@ file=$1
 
 pushd . > /dev/null
 cd "$dir"
-git diff $args $file | head -500
+if [ ! -e "$file" ]; then
+    echo "$file deleted"
+elif git ls-files --error-unmatch "$1" > /dev/null 2>&1; then
+    git diff $args HEAD -- $file | head -500
+else
+    echo "$file added"
+fi
 popd > /dev/null