#!/bin/bash

##
## git-recent
##
## list all local branches, sorted by last commit, formatted reall purdy
##

# Windows needs more basic format (#8, git-for-windows/git#865)
case $(uname -s) in
  CYGWIN*|MINGW*|MSYS*)
    branch='%(refname:short)'
    spacer=' '
    ;;
  *)
    branch='%(color:yellow)%(refname:short)%(color:reset)'
    spacer='%(color:black) %(color:reset)'
    ;;
esac

COUNT=0
while getopts "n:" opt; do
  case ${opt} in
    n )
      if ! [[ $OPTARG =~ ^[0-9]{1,}$ ]]; then
        echo "-n should be an integer."
        exit 1
      fi
      COUNT=${OPTARG}
      shift
      ;;
  esac
done
shift $((OPTIND-1))

# Dont collect upstream details ("[ahead 2, behind 54]"") for big-ass git repos. It's slow.
# TODO: count-object -v is slow. Maybe store setting in repo config somehow
obj_count=$(git count-objects -v 2>/dev/null | grep -- "in-pack" | cut -d " " -f 2)
if [ "$obj_count" -gt "5000000" ]; then
    upstream_deets=""
else
    upstream_deets="%(color:yellow)%(upstream:track)%(color:reset)"
fi

format="\
$branch %(HEAD)\

    %(color:bold red)%(objectname:short)%(color:reset) \
%(color:bold green)(%(committerdate:relative))%(color:reset) \
%(color:bold blue)%(authorname)%(color:reset) \
$upstream_deets
    %(contents:subject)
"

lessopts="--tabs=4 --quit-if-one-screen --RAW-CONTROL-CHARS --no-init"

git for-each-ref \
    --color=always \
    --count=$COUNT \
    --sort=-committerdate \
    "refs/heads/"  \
    --format="$format" \
  | less "$lessopts"

# The above command:
#   for all known branches,
#   (force coloring on this, especially since it's being piped)
#   optionally, specify the number of branches you want to display
#   sort descending by last commit
#   show local branches (change to "" to include both local + remote branches)
#   apply the formatting template above
#   break into columns
#   use the pager only if there's not enough space