#!/bin/bash
# YummiYummiGit - The simplest git wrapper ever, yet convenient
#
# Copyright (C) 2007 Tim Janik <timj@gtk.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# If you have not received a copy of the GNU General Public License
# along with this program, see: http://www.gnu.org/licenses/

#set -e	# exit on errors
#set -x	# show commands

VERSION=YummiYummiGit-0.4
BOLD=true ; NORM=true ; COLOR= ; OUT=cat ; yyINSTALL=false
# figure tty output
tty -s <&1 && {
	BOLD='echo -ne \033[1m' ; NORM='echo -ne \033[0m'
	COLOR=--color ; OUT=less\ -R
}
# perform wildcard string matches
function match() {
	pattern="$1" ; shift
	case "$2" in
	*"$pattern"*) return 0 ;;
	esac
	return 1
}

case "/$0" in
*/yyadd)	exec git-update-index --add -- "$@" ;;
*/yybranch)	test -z "$*" && exec yyhelp
		test "x$1" = "x-f" && exec git-branch -f "$2"
		test -n "$1"       && exec git-branch    "$1" ;;
*/yybranchdel)	test -z "$*" && exec yyhelp
		test "x$1" = "x-f" && exec git-branch -D "$2"
		test "x$1" = "x-D" && exec git-branch -D "$2"
		test -n "$1"       && exec git-branch -d "$1" ;;
*/yyChangeLog)	test -n "$*" && exec yyhelp
		git-log --pretty='format:%ad %an	# %H (%cn)%n%n%s%n%n%b' |
		sed 's/^/	/;s/^	//;/^[ 	]*<unknown>$/d' | $OUT ;;
*/yycommit)	exec cg-commit -- "$@" ;;
*/yydiff)	git-diff-index -r -m -M -C -p $COLOR HEAD -- "$@" | $OUT ;;
*/yygc)		test -n "$*" && exec yyhelp
		exec git-gc --prune ;;
*/yylsbranches)	test -n "$*" && exec yyhelp
		exec git-branch $COLOR ;;
*/yylstags)	test -n "$*" && exec yyhelp
		exec git-tag -l '.*' ;;
*/yypull)	exec git-pull ;;
*/yypushpull)	test -n "$*" && exec yyhelp
		git-push && git-pull || exit $? ;;
*/yyremove)	exec git-update-index --force-remove -- "$@" ;;
*/yyreset)	test -n "$*" && exec yyhelp
		exec git-checkout -f HEAD ;;
*/yyrestore)	git-ls-tree -r HEAD -- "$@" | git-update-index --index-info # resurrect deleted
		exec git-checkout-index -f -u -- "$@" ;;
*/yystatus)	test -n "$*" && exec yyhelp
		exec cg-status -w -x ;;
*/yytag)	test -z "$*" && exec yyhelp
		match " -" " $*" && exec yyhelp
		exec git-tag "$1" ;;
*/yytagdel)	test -z "$*" && exec yyhelp
		match " -" " $*" && exec yyhelp
		exec git-tag -d "$1" ;;
*/yyuncommit)	test -n "$*" && exec yyhelp
		exec git-reset --soft HEAD~1 ;;
*/yyview)	test -n "$*" && exec yyhelp
		exec gitk --all -d ;;
*/yywarp)	test -z "$*" && exec yyhelp
		exec git-checkout "$1" ;;
*/yyhelp)
    test "x$1" = "x--create-aliases" && yyINSTALL=true || {
	echo -e 'YummiYummiGit                                                     YummiYummiGit'
	echo
	$BOLD
	echo -e 'NAME'
	$NORM
	echo -e '\tYummiYummiGit - The simplest git wrapper ever, yet convenient'
	echo
	$BOLD
	echo -e 'SYNOPSIS'
	$NORM
	echo -e '\tyyadd          [FILES...] - add files to git repository'
	echo -e '\tyybranch    [-f] <branch> - add branch (forcable)'
	echo -e '\tyybranchdel [-f] <branch> - delete branch (forcable)'
	echo -e '\tyyChangeLog               - show git log in ChangeLog style'
	echo -e '\tyycommit       [FILES...] - commit current working tree'
	echo -e '\tyydiff         [FILES...] - show committable differences in working tree'
	echo -e '\tyygc                      - repack and prune repository'
	echo -e '\tyyhelp                    - display yy* help information'
	echo -e '\tyylsbranches              - list branches'
	echo -e '\tyylstags                  - list tags'
	echo -e '\tyypull                    - pull upstream sources'
	echo -e '\tyypushpull                - push & pull upstream sources'
	echo -e '\tyyremove       [FILES...] - remove files from git repository'
	echo -e '\tyyreset                   - reset (revert to HEAD) all files in the tree'
	echo -e '\tyyrestore      [FILES...] - forcefully recheckout specific files'
	echo -e '\tyystatus                  - display working tree status'
	echo -e '\tyytag               <tag> - add tag'
	echo -e '\tyytagdel            <tag> - delete tag'
	echo -e '\tyyuncommit                - undo the last commit (must be unpushed)'
	echo -e '\tyyview                    - browse & navigate the history'
	echo -e '\tyywarp           <branch> - checkout new branch'
	echo
	$BOLD
	echo -e 'HISTORY'
	$NORM
	echo -e "\tYummiYummiGit was created as a very shallow wrapper around git-* tool"
	echo -e "\toption variants, to simplify common cases."
	echo -e "\tDepending on programming habits, YummiYummiGit may or may not suit your"
	echo -e "\tdaily needs. It is in any case not meant as a full replacement for the"
	echo -e "\tgit interface (there is e.g. no yyclone) and subject to change."
	echo
	$BOLD
	echo -e 'INSTALLATION'
	$NORM
	echo -e '\tTo install YummiYummiGit, copy yyhelp into a bin/ directory from $PATH'
	echo -e '\tand invoke: ./yyhelp --create-aliases'
	echo
	VERSIONSTRING_FIXED=`printf '%-20s' "$VERSION"`
	echo -e "$VERSIONSTRING_FIXED                                              YummiYummiGit"
    } | $OUT
    ;;
esac

# BACKGROUND
# The prefix 'yy' was choosen to allow conflict free shell completion.
# YummiYummiGit was started only after cogito was announced to be halted.
# It is meant to not depend on cogito one day, albeit that's not yet
# possible.

$yyINSTALL && {
	git --version | egrep '^git version (1\.[5-9]\.|[2-9]\.)' -q ||
					   { echo "$0: failed to install: missing git >= 1.5.0" >&2 ; exit 2 ; }
	test -x ./yyhelp		|| { echo "$0: failed to install: missing ./yyhelp" >&2 ; exit 2 ; }
	test -x /bin/bash		|| { echo "$0: failed to install: missing /bin/bash" >&2 ; exit 2 ; }
	cg --help >/dev/null 2>&1	|| { echo "$0: failed to install: missing cogito" >&2 ; exit 2 ; }
	set -e
	for i in yyadd yybranch yybranchdel yyChangeLog yycommit yydiff yygc \
	         yylsbranches yylstags yypull yypushpull yyremove yyreset yyrestore yystatus \
	         yytag yytagdel yyuncommit yyview yywarp ; do
		test -L $i || ln -s yyhelp $i
	done
}

exit 0