git: Fix working directory of shell aliases

In git aliases, shell commands are executed from the top-level directory
of the repo. Because of this, something like `git glog -- file` didn't
work in subdirectories.

Fix this by creating a wrapper script that first changes into
$GIT_PREFIX before executing the script. Since (currently) the only
use-case is to launch the functions in `autoload/git/`, most of the path
could move into the script, making the git config a lot cleaner.

.config/git/config

@@ -4,14 +4,19 @@
 	addIgnoredFile = off
 	detachedHead = off
 [alias]
+	# NOTE: git-zsh-autoload (./zsh-autoload.sh) is a small wrapper that
+	# launches autoloadable zsh functions (.config/zsh/autoload/git/*) in
+	# the right directory, as shell commands in git aliases are executed
+	# from the top-level directory of the repository.
+
 	autosquash = -c sequence.editor=/bin/true rebase -i --autosquash
 	autofixup= autosquash
 	c = commit
 	changes = flog HEAD...FETCH_HEAD
-	checkout-worktree = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-checkout-worktree\""
+	checkout-worktree = "!git-zsh-autoload checkout-worktree"
 	cow = checkout-worktree
 	co = checkout
-	commit-last-msg = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-commit-last-msg\""
+	commit-last-msg = "!git-zsh-autoload commit-last-msg"
 	clm = commit-last-msg
 	last-msg = commit-last-msg
 	recommit = commit-last-msg --no-edit
@@ -20,20 +25,20 @@
 	ft = fetch-tags-only
 	filter-repo = !git-filter-repo
 	fixes = log -1 --pretty=fixes
-	glog = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/glog\""
+	glog = "!git-zsh-autoload glog"
-	https-and-ssh  = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-https-and-ssh\""
+	https-and-ssh = "!git-zsh-autoload https-and-ssh"
 	ssh-and-https = https-and-ssh
 	l = log
-	last-changed  = "!cd \"$GIT_PREFIX\"; \"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-last-changed\""
+	last-changed = "!git-zsh-autoload last-changed"
-	make-fork = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-make-fork\""
+	make-fork = "!git-zsh-autoload make-fork"
 	p = push
-	perm-stash = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-perm-stash\""
+	perm-stash = "!git-zsh-autoload perm-stash"
 	root = rev-parse --show-toplevel
 	signoff = rebase --signoff
 	ss = stash
-	ssync = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-ssync\""
+	ssync = "!git-zsh-autoload ssync"
-	submodule-rm = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-submodule-rm\""
+	submodule-rm = "!git-zsh-autoload submodule-rm"
-	track = "!\"${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git/git-track\""
+	track = "!git-zsh-autoload track"
 	branches = track
 [blame]
 	date = short

.config/git/zsh-autoload.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2025 Julian Prein
+#
+# Meant to be used in git aliases to launch an autoloadable zsh function in the
+# correct directory.
+
+if [ $# -eq 0 ]; then
+	printf >&2 "Usage: $(basename "$0") <function>\n"
+	exit 1
+fi
+
+BASE="${XDG_CONFIG_HOME:-$HOME/.config}/zsh/autoload/git"
+
+# In git aliases, shell commands are executed from the top-level directory of
+# the repo. GIT_PREFIX contains the original directory relative to the
+# top-level.
+[ -z "$GIT_PREFIX" ] || cd "$GIT_PREFIX"
+
+# no need for error handling, the message from sh is descriptive enough
+if [ "${1#git-}" != "$1" ] || [ -e "$BASE/$1" ]; then
+	exec "$BASE/$@"
+else
+	exec "$BASE/git-$@"
+fi

.local/bin/git-zsh-autoload

@@ -0,0 +1 @@
+../../.config/git/zsh-autoload.sh