zsh: misc git functions

.config/dotfiles/gitignore

@@ -11,6 +11,7 @@
 !/.config/zsh/alias/buildah.zsh
 !/.config/zsh/alias/diff.zsh
 !/.config/zsh/alias/directories.zsh
+!/.config/zsh/alias/git.zsh
 !/.config/zsh/alias/gpg.zsh
 !/.config/zsh/alias/grep.zsh
 !/.config/zsh/alias/history.zsh

.config/zsh/alias/git.zsh

@@ -0,0 +1,34 @@
+#!/bin/zsh
+
+git-dir-usage() {
+    local d x p
+    d=$(__z_git rev-parse --git-dir) || return $?
+    x=$(__z_git rev-parse --path-format=absolute 2>/dev/null)
+    if [ -n "$x" ] ; then
+        ## older git version which does not support "--path-format=absolute"
+        :
+    else
+        d=$(__z_git rev-parse --path-format=absolute --git-dir)
+    fi
+    case "$d" in
+    */* ) p=${d%/*} ; d=${d##*/} ;;
+    esac
+    ## ${p:+ env -C "$p" } du -cd2 "$d"
+    if [ -n "$p" ] ; then
+        env -C "$p" du -cd2 "$d"
+    else
+        du -cd2 "$d"
+    fi | grep -Ev '^[0-9]\s' | sort -Vk2
+}
+
+git-gc() {
+    git-dir-usage || return $?
+    echo
+    idle git gc "$@"
+    echo
+    git-dir-usage
+}
+
+git-gc-force() {
+    git-gc --aggressive --force
+}