#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-only

#  (kgit-meta), (processes a meta-series to construct a git tree)

#  Copyright (c) 2008-2013 Wind River Systems, Inc.

#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License version 2 as
#  published by the Free Software Foundation.

#  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.

#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

# For consistent behaviour with "grep -w"
LC_ALL=C
export LC_ALL

# figure out where we are
mypath=${0%/*}
if [ "$mypath" = "$0" ]
then
  mypath="."
fi
full_path=$(dirname $(readlink -f $0));

usage()
{
cat <<EOF

 kgit-meta [--resume] [-v] [-h] <meta-series>

   Uses meta-series <meta-series> to create a git repository

   --resume: resume processing, even if branches exist
   -h      : help
   -v      : verbose

EOF
}

# command line processing
vlevel=0
while [ $# -gt 0 ]; do
    case "$1" in
	-f|--force)
	    _force=t
	    ;;
        -r|--resume)
	    resume=t
	    ;;
	-rc|--rc)
	    _rc_file=$2
            shift
	    ;;
	-v|--v)
	    verbose=t
	    vlevel=`expr $vlevel + 1`
	    ;;
	-h|--h|--help) 
	    usage
            exit;
            ;;
	*)
	    break
	    ;;
    esac
    shift
done

if [ ! $# -gt 0 ]; then
    usage
    exit
fi

meta_series=$1
if [ ! -e "$meta_series" ]; then
    echo "ERROR. meta series '$meta_series' does not exist..."
    exit 1
fi


path=`dirname $0`
. $path/kgit

if [ -z "$verbose" ]; then
    _redir="> /dev/null"
else
    if [ "$vlevel" -eq 2 ]; then
	_redir=""
    else
	_redir="> /dev/null"	
    fi
fi

progress_increment()
{
    pdone=`expr $pdone + 1`
    progress_update
}

spin_count=1
progress_update()
{
    percent_done=`expr $pdone \* 100 / $ptotal`
    hash_count=`expr $percent_done / 2`
    remainder=`expr 50 - $hash_count`

    case $spin_count in
	1) bar='|'
           spin_count=`expr $spin_count + 1`
           ;;
        2) bar='/'
           spin_count=`expr $spin_count + 1`
           ;;
        3) bar='-'
           spin_count=`expr $spin_count + 1`
           ;;	
        4) bar='\'	
	   spin_count=1
           ;;
    esac

    # for each 2%, print one #
    echo -n "  ["
    for i in `seq $hash_count`; do
	echo -n '#'
    done
    for in in `seq $remainder`; do
 	echo -n ' '
    done
    echo -ne "] ($bar)($percent_done %)\r"
}

progress_done()
{
    extra_message="$1"

    # for each 2%, print one #
    echo -n "  ["
    for i in `seq 50`; do
	echo -n '#'
    done
    echo -e "]  (completed $extra_message)                    "
}

# Checks that git is configured properly for merge/commit operations
# If it isn't globally configured, the repository is configured locally
# to allow commits to the repo
git_sanity_check()
{
    git config --global --get user.name > /dev/null
    if [ $? -ne 0 ]; then
	git config user.name "Auto Configured"
	git config user.email "auto.configured"
    fi
}

#
# gather and organize the information require to generate a repo
if [ -n "$_rc_file" ] && [ -e "$_rc_file" ]; then
    cat $_rc_file | while read blah; do
	for b in $blah; do
	    case $b in
		--*) # ignore
                     ;;
		*=*) eval $b
                     ;;
	    esac
	done
    done
fi

# returns 0 if "branch" or "branch/base" already exists
# echos the name of the branch that matched
check_branch() {
    local b=$1

    git show-ref --verify --quiet refs/heads/${b}
    if [ $? -ne 0 ]; then
        git show-ref --verify --quiet refs/heads/${b}/base
        if [ $? -ne 0 ]; then
            echo ${b}
            return 1
        else
            echo ${b}/base
            return 0
        fi
    else
        echo ${b}
        return 0
    fi
}

meta_dir="$(dirname ${meta_series})"
# process the meta series, line by line
OLDIFS=${IFS}
IFS='
'
for fline in `cat ${meta_series}`; do
    case ${fline} in
        patch*)
            # do nothing at the moment
            ;;
        branch\ rename:*)
            b=$(echo ${fline} | cut -d: -f2 | sed 's%^\ %%')
            echo "[INFO]: branch rename: ${b}"
            old=$(echo ${b} | cut -d' ' -f1)
            new=$(echo ${b} | cut -d' ' -f2)
            x="$(check_branch ${new})"
            if [ $? -ne 0 ]; then
                eval git branch -m ${old} ${new}
            else
                echo "[INFO]: branch ${new} already exists"
            fi
            eval git checkout ${new}
            ;;
        branch:*)
            dopatch=

            b=$(echo ${fline} | cut -d: -f2 | sed 's%^\ %%')
            b="$(check_branch ${b})"
            if [ $? -ne 0 ]; then
                echo "[INFO]: branch create: ${b}"
                eval git checkout -b ${b}
                # clear any patch fence posts
                rm -f .git/kgit-s2q.last
                dopatch=t
            else
                echo "[INFO]: reusing branch ${b}"
                eval git checkout ${b}
                if [ -n "${resume}" ]; then
                    dopatch=t
                fi
            fi

            if [ -n "${dopatch}" ]; then
                # now check to see if there's a patch queue
                qname="patch.${b}.queue"
                qname="$(echo ${qname} | sed 's%/%.%g')"
                if [ ! -e "${meta_dir}/${qname}" ]; then
                    # try it without ".base", in case a branch was renamed
                    b=$(echo "${b}" | sed 's%/base%%')
                    qname="patch.${b}.queue"
                    qname="$(echo ${qname} | sed 's%/%.%g')"
                fi
                if [ -e "${meta_dir}/${qname}" ]; then
                    echo "[INFO]: patch queue \"${qname}\" detected, applying patches"
                    rm -f ${meta_dir}/series
                    ln -sf ${qname} ${meta_dir}/series
                    kgit-s2q --gen -v --patches ${meta_dir}
                    if [ $? -ne 0 ]; then
                        exit 1
                    fi
                fi
            fi
            ;;
        merge:*)
            b=$(echo ${fline} | cut -d: -f2 | sed 's%^\ %%')
            check_branch ${b}
            if [ $? -ne 0 ]; then
                echo "ERROR. branch ${b} does not exist, can't merge"
                exit 1
            else
                echo "[INFO]: branch merge: ${b}"
                eval git merge -q --no-ff -m \"Merge branch ${b}\" ${b}
                if [ $? -ne 0 ]; then
                exit 1
                fi
            fi
            ;;
        *)
            ;;
    esac

done