[git] Fix git stash alias,set default pull options

Fixed git stash alias (gsta) not correctly detecting zsh shell for git
version guessing.

Set default options to automatically rebase on pull, automatically prune
on fetch, and automatically stash and squash on rebasing.

Also made git diff highlight moved code.

git/.config/sh/alias.d/git.sh

@@ -47,14 +47,19 @@ if exist git; then
 
   alias gst='git status'
 
-  if [ "$0" = "/bin/zsh" ]; then
+  # if git is at least version 2.13, we can use git stash push
+  # in shells other than zsh, simply fall back to save
+  case "$(ps -cp "$$" -o command="")" in
+  *zsh*)
     autoload -Uz is-at-least
     if is-at-least 2.13 "$(git --version 2>/dev/null | awk '{print $3}')"; then
       alias gsta='git stash push'
     else
       alias gsta='git stash save'
     fi
-  fi
+    ;;
+  *) alias gsta='git stash save' ;;
+  esac
   alias gstp='git stash pop'
   alias gstl='git stash list'
 fi