#!/usr/bin/env zsh

# Commit, but put the last written commit message into the editor buffer. For
# this it uses .git/COMMIT_EDITMSG but deletes all commented lines and
# everything from the cut line on (i.e. `-- >8 --`). All arguments are passed to
# git-commit.
#
# Useful for example when the commit-msg hook fails but only slight
# modifications are needed. For example, just run:
#
#     git-commit-last-msg --no-verify --no-edit

local gitdir cut_line cchar
cut_line='------------------------ >8 ------------------------'

gitdir="$(git rev-parse --git-dir)" || return

cchar="$(git config --get --default='#' core.commentchar)"
# only ^ needs escaping because of the character class used
cchar="${cchar//^/\\^}"

git commit -eF <(sed -n "/$cut_line/q; /^[$cchar]/!p" "$gitdir/COMMIT_EDITMSG") "$@"