Update tags via git hooks

Based on http://tbaggery.com/2011/08/08/effortless-ctags-with-git.html.
Makes use of vim-gutentags update script.

Author: blueyed

config/git/template/hooks/ctags

@@ -0,0 +1,25 @@
+#!/bin/sh
+# TODO: only update changed files, e.g. in post-commit hook!?
+#  - post-merge: git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD
+#  - post-commit: git log --name-only --pretty=format: -n1
+#    - Does it include deleted files?
+
+hook_name=${1:-$(basename $0)}
+# echo "Updating tags via git hook ($hook_name)…" >&2
+
+mkdir .git/tags_lock 2>/dev/null || {
+  echo "Lockfile exists.. skipping." >&2
+  exit 0
+}
+(
+  trap 'rmdir .git/tags_lock' EXIT
+
+  gtags=~/.dotfiles/vim/neobundles/gutentags/plat/unix/update_tags.sh
+  if ! [ -f "$gtags" ]; then
+    echo "$gtags not found. Skipping." >&2
+    exit
+  fi
+
+  export CTAGS="-L -"
+  git ls-files | "$gtags" -e ctags -t tags -p . >/dev/null
+) &

config/git/template/hooks/post-checkout

@@ -5,22 +5,40 @@
 # new_head=$2
 # changing_branch=$3
 
-if [ "$3" = 0 ]; then
+is_clone=0
+if [ "$3" = 1 ]; then
+  if [ "$1" = "0000000000000000000000000000000000000000" ]; then
+    is_clone=1
+    prog="$(ps -p $(ps -p "$PPID" -o ppid=) -o comm=)"
+    # if [ "${PWD#/tmp/pacaurtmp}" != "$PWD" ]; then
+    if [ "$prog" = "pacaur" ]; then
+      exit
+    fi
+  fi
+else
+  # Checking out a file.
+  .git/hooks/ctags post-checkout &
   exit
 fi
 
 # Special template/display for "pip" cloning/checking out a VCS URL.
-if [ $(ps -p $(ps -p $PPID -o ppid=) -o comm=) = 'pip' ]; then
+if [ -z "$prog" ]; then
+  prog="$(ps -p $(ps -p "$PPID" -o ppid=) -o comm=)"
+fi
+if [ "$prog" = 'pip' ]; then
   # Get "git" command from 2nd "args" entry of git parent process.
+  # TODO: move to clone block above?  / use is_clone flag for pip.
   mode=$(ps -f -p $PPID -o args= | cut -f2 -d\ )
-  if [ $mode = checkout ]; then  # "checkout" might follow "clone".
-    git --no-pager log -1 --pretty=format:"%C(green) checkout: $(basename $PWD): %C(blue)%s%C(reset) (%cr, %h, %cN)"
+  if [ "$mode" = checkout ]; then  # "checkout" might follow "clone".
+    git --no-pager log -1 --pretty=format:"%C(green) checkout: $(basename "$PWD"): %C(blue)%s%C(reset) (%cr, %h, %cN)"
   else
-    git --no-pager log -1 --pretty=format:"%C(green)pip-$mode: $(basename $PWD): %C(blue)%s%C(reset) (%cr, %h, %cN)"
+    git --no-pager log -1 --pretty=format:"%C(green)pip-$mode: $(basename "$PWD"): %C(blue)%s%C(reset) (%cr, %h, %cN)"
   fi
 
 else
   git --no-pager log -1 --pretty=format:"Last commit: %C(blue)%s%C(reset) (%cr, %h, %cN)"
+  .git/hooks/ctags post-checkout &
 fi
 # Note: --no-pager does not add a newline.
 echo
+

config/git/template/hooks/post-commit

@@ -0,0 +1 @@
+ctags

config/git/template/hooks/post-merge

@@ -0,0 +1 @@
+ctags

config/git/template/hooks/post-rewrite

@@ -0,0 +1,4 @@
+#!/bin/sh
+if [ "$1" = "rebase" ]; then
+  exec .git/hooks/post-merge
+fi