git🐮 Fix GIT_DIR for submodules via git alias

Git sets some environment variables when executing a shell command.
Specifically it sets GIT_DIR when called inside a submodule. This makes
git inside the subshell target the main worktree instead of the
temporary one.

.config/git/config

@@ -52,6 +52,38 @@
 	sort = -committerdate
 [clone]
 	filterSubmodules = yes
+[color "diff"]
+	# Make all bold colors also bright. See diff_colors in git's diff.c
+	oldMoved = bold brightmagenta
+	oldMovedAlternative = bold brightblue
+	newMoved = bold brightcyan
+	newMovedAlternative = bold brightyellow
+	oldBold = bold brightred
+	newBold = bold brightgreen
+[color "decorate"]
+	# Make all bold colors also bright. See decoration_colors in git's
+	# log-tree.c
+	branch = bold brightgreen
+	remoteBranch = bold brightred
+	tag = bold brightyellow
+	stash = bold brightmagenta
+	HEAD = bold brightcyan
+	grafted = bold brightblue
+[color "grep"]
+	# Make all bold colors also bright. See GREP_OPT_INIT in git's grep.h
+	matchContext = bold brightred
+	matchSelected = bold brightred
+[color "interactive"]
+	# Make all bold colors also bright. See init_add_i_state in git's
+	# add-interactive.c
+	help = bold brightred
+	prompt = bold brightblue
+	error = bold brightred
+[color "remote"]
+	# Make all bold colors also bright. See keywords in git's sideband.c
+	warning = bold brightyellow
+	success = bold brightgreen
+	error = bold brightred
 [color "status"]
 	added = 076
 	untracked = 014
@@ -69,7 +101,7 @@
 	abbrev = 12
 	#pager = delta
 	pager = diff-so-fancy | less --tabs=8 --RAW-CONTROL-CHARS
-	whitespace = trailing-spaces,space-before-tab,indent-with-non-tab
+	whitespace = trailing-spaces,space-before-tab,indent-with-non-tab,tabwidth=8
 [delta]
 	navigate = true
 	commit-decoration-style = bold yellow box
@@ -102,6 +134,12 @@
 	singleKey = true
 [log]
 	follow = true
+	# Make all colors bold and additionally use bright versions of
+	# previously bold-only colors. See column_colors_ansi in git's color.c
+	# used by graph.c
+	graphColors = bold red,bold green,bold yellow,bold blue,bold magenta,bold cyan,bold brightred,bold brightgreen,bold brightyellow,bold brightblue,bold brightmagenta,bold brightcyan
+	# Show all refs as decoration (e.g. also notes)
+	initialDecorationSet = all
 [merge]
 	conflictstyle = diff3
 	log = true
@@ -118,7 +156,7 @@
 [rerere]
 	enabled = false
 [status]
-	submodulesummary = true
+	submoduleSummary = true
 [submodule]
 	fetchJobs = 0
 [trailer]
@@ -127,5 +165,6 @@
 	email = julian@druck.dev
 	name = Julian Prein
 	signingkey = C0A44F69F2E29F6586C86B96CA6B3A516FAC2555
+
 [include]
 	path = user.config

.config/zsh/autoload/git/git-checkout-worktree

@@ -31,11 +31,13 @@
 
 emulate -L zsh -o err_return -o no_unset
 
-local REPO_NAME WORKTREE_PATH
+local git_dir cwd_offset REPO_NAME WORKTREE_PATH
 # Use the folder name of the main working tree to make calls from another
 # temporary working tree possible
-REPO_NAME="${${${$(git rev-parse --git-dir):A}%%/.git*}:t}"
-WORKTREE_PATH="$(mktemp -d -p "" "worktree.XXX.$REPO_NAME.${1//\//_}")"
+git_dir="${$(git rev-parse --git-dir):A}"
+[[ $git_dir == */.git/modules/* ]] || git_dir="${git_dir%%/.git*}"
+REPO_NAME="${git_dir:t}"
+WORKTREE_PATH="$(mktemp -d -p "" "wtree.$REPO_NAME.${1//\//_}.XXX")"
 
 local errc ret=0
 git worktree add "$WORKTREE_PATH" "$@" || ret=$?
@@ -47,11 +49,27 @@ fi
 
 trap '
 	errc=$?
-	<&2 printf "Exiting abnormally. Check and possibly remove '$WORKTREE_PATH' manually.\n"
+	<&2 printf "Exiting abnormally. Check and possibly remove \"%s\" manually.\n" "'$WORKTREE_PATH'"
 	return $errc
 ' INT QUIT TERM EXIT
 
+cwd_offset="${${PWD#$(git rev-parse --show-toplevel)}#/}"
 pushd -q "$WORKTREE_PATH"
+until [[ -d $cwd_offset || -z $cwd_offset ]]; do
+	cwd_offset="${cwd_offset:h}"
+done
+[[ -z $cwd_offset ]] || cd "$cwd_offset"
+
+# Discard some environment variables that were set by git when calling this
+# script through an alias.
+#
+# Is set for submodules and will confuse git in the subshell
+unset GIT_DIR
+# Not sure if this can bring any issues, but better be safe
+unset GIT_PREFIX
+# TODO: Do we want to unset this too? Could have been set on purpose by the user
+#  and not git. Maybe only for the subshell via `env`?
+#unset GIT_EXEC_PATH
 
 "$SHELL" && errc=$? || errc=$?
 (( !errc )) || echo "shell exited with $errc"