#!/bin/bash
# List git activity on one day across every repo `locate` knows about.
#
# Usage: day-in-repos.sh YYYY-MM-DD [git-log-args...]
#
# Prints commits (by committer date) and reflog entries (pulls, checkouts,
# amends: local-only events that `git log` never shows), sorted by local
# time. A commit present in several clones/worktrees is printed once, with
# every repo it appears in. Extra args go to `git log`, e.g. --author=dckc
# to drop bot and upstream commits.
set -euo pipefail

[[ $# -ge 1 && $1 =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]] || {
  sed -n '2,10p' "$0"
  exit 2
}
day=$1
shift
next=$(date -d "$day + 1 day" +%F)

locate -r '/\.git$' \
  | grep "^$HOME/" \
  | grep -v -e /node_modules/ -e /.cache/ -e /.cargo/ -e /go/pkg/ \
  | while read -r g; do
      r=${g%/.git}
      name=${r#"$HOME"/}
      git -C "$r" log --all --since="$day 00:00" --until="$next 00:00" \
        --date=format:%H:%M --format="%cd	%h	$name	%s" "$@" 2>/dev/null || true
      git -C "$r" reflog --all --date=format:'%F %H:%M' \
        --format="%gd	$name	%gs" 2>/dev/null \
        | awk -F'\t' -v day="$day" '
            match($1, /\{[0-9-]+ [0-9:]+\}/) {
              ts = substr($1, RSTART + 1, RLENGTH - 2)
              if (substr(ts, 1, 10) == day)
                printf "%s\treflog\t%s\t%s\n", substr(ts, 12), $2, $3
            }' || true
    done \
  | awk -F'\t' '
      # group by time+hash (reflog rows by time+subject)
      { key = ($2 == "reflog") ? $1 FS $4 : $1 FS $2
        if (!(key in repos)) { order[++n] = key; line[key] = $0 }
        if (!((key, $3) in seen)) {
          seen[key, $3] = 1
          repos[key] = repos[key] (repos[key] ? " " : "") $3
        } }
      END {
        for (i = 1; i <= n; i++) {
          split(line[order[i]], f, FS)
          printf "%s %-7s %s  [%s]\n", f[1], f[2], f[4], repos[order[i]]
        }
      }' \
  | sort