[git] Add git-branch-delete-interactive

that prompts if upstream remote branch(es) should be deleted too. As
with `git branch`, the function supports multiple branches as params,
and also the `-r`/`--remotes` param. Update `gbx` and `gbX` to use this
function.

Also update `git-stash-clear-interactive` to have multiple tests instead
of multiple nested `if`/`then`/`fi`. (Simpler syntax, IMHO)

modules/git/functions/git-branch-delete-interactive

@@ -0,0 +1,16 @@
+# vim:et sts=2 sw=2 ft=zsh
+local -a remotes
+if (( ${*[(I)-r]} || ${*[(I)--remotes]} )); then
+  remotes=(${^*:#-*})
+else
+  remotes=(${(f)"$(command git rev-parse --abbrev-ref ${^*:#-*}@{u} 2>/dev/null)"})
+fi
+if command git branch --delete ${@} && \
+    (( ${#remotes[@]} )) && \
+    read -q "?Also delete remote branch(es) ${remotes} [y/N]? "; then
+  print
+  local remote
+  for remote (${remotes}); do
+    command git push ${remote%%/*} :${remote#*/}
+  done
+fi

modules/git/functions/git-stash-clear-interactive

@@ -3,8 +3,8 @@ setopt LOCAL_OPTIONS PIPE_FAIL
 
 local -i stashed
 stashed=$(command git stash list | wc -l) || return 1
-if (( stashed )); then
-  if read -q "?Clear ${stashed} stashed state(s) [y/N]? "; then
-    command git stash clear
-  fi
+if (( stashed )) && \
+    read -q "?Clear ${stashed} stashed state(s) [y/N]? "; then
+  print
+  command git stash clear
 fi

modules/git/init.zsh

@@ -29,8 +29,8 @@ alias gbm='git branch --move'
 alias gbM='git branch --move --force'
 alias gbs='git show-branch'
 alias gbS='git show-branch --all'
-alias gbx='git branch --delete'
-alias gbX='git branch --delete --force'
+alias gbx='git-branch-delete-interactive'
+alias gbX='git-branch-delete-interactive --force'
 
 # Commit (c)
 alias gc='git commit --verbose'