gitty/girt-commit at main · soroush-msd/gitty · GitHub

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#!/bin/dash

# if the .girt does not exit, output error message and exit
if ! test -d ".girt"
then
    echo "$0 : error: girt repository directory .girt not found" 1>&2
    exit 1
fi

# store message in $message as the last argument is always the message
for message in "$@"
do
    # if the number of args is incorrect, output error and exit
    # orders and positions are not tested
    if test "$#" -lt 2 || test "$#" -gt 3
    then
        echo "usage: $0 [-a] -m commit-message" 1>&2
        exit 1

    # if $# is 2 check the order of -m flag and message is correct
    elif test "$#" -eq 2
    then
        message_2=$(echo "$2" | grep -E '^[^-]')
        if test "$1" = "-m" && test "$message_2" != ""
        then
            continue

        # else just output the usage and exit 1
        else
            echo "usage: $0 [-a] -m commit-message" 1>&2
            exit 1
        fi

    # if number of args is 3 -a flag must have been provided
    elif test "$#" -eq 3
    then

        # check the order of args is correct
        message_3=$(echo "$3" | grep -E '^[^-]')
        if test "$1" = "-a" && test "$2" = "-m" && test "$message_3" != ""
        then
            continue

        # else just output the usage and exit 1
        else
            echo "usage: $0 [-a] -m commit-message" 1>&2
            exit 1
        fi
    fi
done


index_files=$(ls .girt/index/* 2> /dev/null | wc -l) # number of files in index
commit_num=$(ls .girt/commit/ 2> /dev/null | wc -l) # number of commits made so far
commit_num=$(($commit_num-2)) # latest commit number (-2 to account for log.txt in commit repo)
commit_num_next=$(($commit_num+1)) # commit number for next commit to be made

# number of files in the latest commit
commit_file_numbers=$(ls .girt/commit/$commit_num/ 2> /dev/null | wc -l)

# a function to make a new commit
commit(){

    # make new commit dir being named based on the next commit number
    mkdir ".girt/commit/$commit_num_next" &&

    # copy the contents of the index into the new commit dir
    cp -r ".girt/index/." ".girt/commit/$commit_num_next/" &&
    echo "Committed as commit $commit_num_next" &&

    # add the commit number along with the commit message to log.txt
    echo "$commit_num_next $message" >> ".girt/commit/log.txt" &&
    commit_num_next=$(($commit_num+1))
    exit 0
}

if test "$#" -eq 2
then
    #if repo (commit) folder is empty
    if test "$commit_num" -eq -1
    then

        # if index is empty, there is nothing to commit
        if test "$index_files" -eq 0
        then
            echo "nothing to commit"
            exit 0

        # if index is not empty, copy the contents of index in commit and
        # write to the log
        else
            commit
        fi

    # if commit repo is not empty
    else
        commit_files=$(ls .girt/commit/$commit_num 2> /dev/null | wc -l)

        # if number of files in index and latest commit folder is different
        # make a new commit
        if test "$commit_files" -ne "$index_files"
        then
            commit

        # if they have the same number of folders
        else

            # if both have 0 files - nothing to commit
            if test "$commit_file_numbers" -eq 0 && test "$index_files" -eq 0
            then
                echo "nothing to commit"
                exit 0

            # else loop through the files in index
            else
                for files in ".girt/index/"*
                do
                    base_name=$(echo "$files" | cut -d'/' -f3)

                    # if a file with the same name exists in the latest commit dir
                    if test -e ".girt/commit/$commit_num/$base_name"
                    then

                        # do diff to check whether the file has been changed - if not continue
                        if diff "$files" ".girt/commit/$commit_num/$base_name" >/dev/null
                        then
                            continue

                        # else make a new commit
                        else
                            commit
                        fi

                    # if the file does not exist in the commit dir - make a new commit
                    else
                        commit
                    fi
                done
                echo "nothing to commit"
                exit 0
            fi
        fi
    fi

# if -a option is requested
else
    for indexed_file in ".girt/index/"*
    do
        index_size=$(ls .girt/index/ 2> /dev/null | wc -l)

        # if the index is not empty - add the files with the same name from cwd
        if test "$index_size" -ne 0
        then
            base_name=$(echo "$indexed_file" | cut -d'/' -f3)
            sh girt-add "$base_name"
        fi
    done

    # and call this file again without -a option
    sh girt-commit -m "$3"
fi