.githelpers

#!/bin/bash

# Log output:
#
# * 51c333e    (12 days)    <Gary Bernhardt>   add vim-eunuch
#
# The time massaging regexes start with ^[^<]* because that ensures that they
# only operate before the first "<". That "<" will be the beginning of the
# author name, ensuring that we don't destroy anything in the commit message
# that looks like time.
#
# The log format uses } characters between each field, and `column` is later
# used to split on them. A } in the commit subject or any other field will
# break this.

HASH="%C(yellow)%h%Creset"
RELATIVE_TIME="%Cgreen(%ar)%Creset"
AUTHOR="%C(bold blue)<%an>%Creset"
REFS="%C(bold red)%d%Creset"
SUBJECT="%s"

FORMAT="$HASH}$RELATIVE_TIME}$AUTHOR}$REFS $SUBJECT"

ANSI_BLACK='\033[30m'
ANSI_BLACK_BOLD='\033[0;30;1m'
ANSI_RED='\033[31m'
ANSI_RED_BOLD='\033[0;31;1m'
ANSI_GREEN='\033[32m'
ANSI_GREEN_BOLD='\033[0;32;1m'
ANSI_YELLOW='\033[33m'
ANSI_YELLOW_BOLD='\033[0;33;1m'
ANSI_BLUE='\033[34m'
ANSI_BLUE_BOLD='\033[0;34;1m'
ANSI_MAGENTA='\033[35m'
ANSI_MAGENTA_BOLD='\033[0;35;1m'
ANSI_CYAN='\033[36m'
ANSI_CYAN_BOLD='\033[0;36;1m'
ANSI_WHITE='\033[37m'
ANSI_WHITE_BOLD='\033[0;37;1m'
ANSI_RESET='\033[0m'


show_git_head() {
		pretty_git_log -1
		git show -p --pretty="tformat:"
}

pretty_git_log() {
		git log --graph --pretty="tformat:${FORMAT}" $* |
				# Replace (2 years ago) with (2 years)
				sed -Ee 's/(^[^<]*) ago\)/\1)/' |
				# Replace (2 years, 5 months) with (2 years)
				sed -Ee 's/(^[^<]*), [[:digit:]]+ .*months?\)/\1)/' |
				# Line columns up based on } delimiter
				column -s '}' -t |
				# Color merge commits specially
				sed -Ee "s/(Merge (branch|remote-tracking branch|pull request) .*$)/$(printf $ANSI_RED)\1$(printf $ANSI_RESET)/" |
				# Page only if we're asked to.
				if [ -n "$GIT_NO_PAGER" ]; then
						cat
				else
						# Page only if needed.
						less --quit-if-one-screen --no-init --RAW-CONTROL-CHARS --chop-long-lines
				fi
}