#!/bin/bash
# Mirror every repo under the ghq root (~/Code/<host>/<owner>/<repo>) as a
# symlink ~/Projects/<repo>. Repos sharing a name across owners get
# <owner>-<repo>. Links into ~/Code whose repo is gone are removed; anything
# in ~/Projects that is not such a link is never touched. Run by
# projects-sync.timer (systemd user).
set -euo pipefail

code=${GHQ_ROOT:-$HOME/Code}
projects=$HOME/Projects
mkdir -p "$projects"

mapfile -t repos < <(find "$code" -mindepth 4 -maxdepth 4 -name .git -printf '%h\n' 2>/dev/null | sort)

declare -A count keep
for repo in "${repos[@]}"; do
  name=${repo##*/}
  count[$name]=$((${count[$name]:-0} + 1))
done

for repo in "${repos[@]}"; do
  name=${repo##*/}
  if ((count[$name] > 1)); then
    owner=${repo%/*}
    name=${owner##*/}-$name
  fi
  link=$projects/$name
  keep[$name]=1
  [[ -e $link && ! -L $link ]] && continue
  [[ $(readlink "$link") == "$repo" ]] || ln -sfn "$repo" "$link"
done

for link in "$projects"/*; do
  [[ -L $link && $(readlink "$link") == "$code"/* && -z ${keep[${link##*/}]:-} ]] && rm "$link"
done
exit 0