#!/usr/bin/env zsh
 autoload -U colors
 colors
 
 set -eu -o pipefail
 
 function define() {
   IFS='\n' read -r -d '' ${1} || true;
 }
 
 local commit_template_fn="$(mktemp)"
 TRAPEXIT() {
   rm "$commit_template_fn"
 }
 
 function git-issue-start() {
   >"$commit_template_fn" <<"EOF"
 issue: 
 
 # issue body
 EOF
 
   git stash
   TRAPEXIT() {
     git stash pop
   }
   git commit --allow-empty -t "$commit_template_fn"
 }
 
 git-issue-sum() {
   git log --format=format:"%h: %s" --grep issue:
 }
 alias git-issue-list=git-issue-sum
 alias git-issue-summary=git-issue-sum
 
 
 function git-issue-summarize() {
   git show -s --format=format:"%h: %s" "${1?need a ref}" --
   echo
 }
 
 git-issue-normalize-ref () {
   git show -s --format=format:"%h" ${1?need a ref} --
 }
 
 git-issue-closed-commits() {
   git log --format=format:"%h:%s" --grep close | sed -E 's/^.*:close\(([^)]+)\):.*$/\1/' | sort
 }
 git-issue-aborted-commits() {
   git log --format=format:"%h:%s" --grep abort | sed -E 's/^.*:abort\(([^)]+)\):.*$/\1/' | sort
 }
 git-issue-issue-commits() {
   git log --format=format:"%h" --grep issue: | sort
 }
 
 git-issue-open() {
   comm -23 <( ( git-issue-issue-commits ) ) <( ( git-issue-closed-commits ) ) | {
     while read -r; do
       git-issue-summarize "$REPLY"
     done
   }
 }
 
 git-issue-closed() {
   git-issue-closed-commits | {
     while read -r; do
       git-issue-summarize "$REPLY"
     done
   }
 }
 
 git-issue-aborted() {
   git-issue-aborted-commits | {
     while read -r; do
       git-issue-summarize "$REPLY"
     done
   }
 }
 
 git-issue-progress() {
   : ${1?need a ref}
   issue="$(git-issue-normalize-ref "$1")"
 
   git-issue-show "$issue"
   echo
 
   git log \
     --format=format:$'%h: %s\n' \
     --grep "$(git-issue-normalize-ref "${issue}")" |
     gtac
 }
 
 in-progress() {
   : ${1?need a ref}
   issue="$(git-issue-normalize-ref "$1")"
 
   git log \
     --format=format:$'%h: %s\n' \
     --grep "$(git-issue-normalize-ref "${issue}")" |
     grep -v "close($issue)"
 }
 
 git-issue-ip() {
   in-progress "$@"
 }
 
 function git-issue-all() {
   {
     git-issue-open | {
       while read -r; do 
         if in-progress "${REPLY%%:*}" >/dev/null; then
           printf "${fg[yellow]}PROGRESS${reset_color}\t$REPLY\n";
         else
           printf "${fg[green]}OPEN${reset_color}\t$REPLY\n";
         fi
       done 
     } | sort -r
     git-issue-closed | {
       while read -r; do
         printf "${fg[red]}CLOSED${reset_color}\t$REPLY\n";
       done 
     }
     git-issue-aborted | {
       while read -r; do
         printf "${fg[red]}ABORTED${reset_color}\t$REPLY\n";
       done 
     }
   } | column -t -s $'\t'
 }
 
 git-issue-show() {
   git show --format=full "$1" --
 }
 
 git-issue-show-brief() {
   git show --format=format:"%h: %s" "$1" --
 }
 
 git-issue-close() {
   issue="$(git-issue-normalize-ref "${1?must provide an issue hash to close}")"
 
   if ! git-issue-show "$issue" &>/dev/null; then
     echo "invalid issue '$issue' provided" >&2
     return
   fi
 
   >"$commit_template_fn" <<EOF
 abort($issue): 
 EOF
 
   git commit --allow-empty -t "$commit_template_fn"
 }
 
 git-issue-abort() {
   issue="$(git-issue-normalize-ref "${1?must provide an issue hash to close}")"
 
   if ! git-issue-show "$issue" &>/dev/null; then
     echo "invalid issue '$issue' provided" >&2
     return
   fi
 
   >"$commit_template_fn" <<EOF
 abort($issue): 
 EOF
 
   git commit --allow-empty -t "$commit_template_fn"
 }
 
 local subcmd=$1
 shift
 
 "git-issue-$subcmd" "$@"