shrug-status

#!/bin/dash

root_folder='.shrug'

if [ ! -d $root_folder ]; then
    echo 'shrug-add: error: no .shrug directory containing shrug repository exists'
    exit 1
else
    current_working_file_list=`ls`

    staged_file_list=`cat .shrug/.git/index | cut -d ' ' -f2 | tr '\n' ' '`

    last_commit_seq=`cat .shrug/.git/COMMIT_EDITMSG | head -1 | cut -d' ' -f1`
    last_commit_repo_file_list=`cat .shrug/.git/objects/pack/pack-$last_commit_seq.idx | cut -d ' ' -f2 | tr '\n' ' '`

    # create the filename list need to be check status
    # 1 current working file names
    # 2 staged file names
    # 3 last commit repo file names
    file_status_iteration_list=`echo $current_working_file_list $staged_file_list $last_commit_repo_file_list | tr ' ' '\n' | sort | uniq | sort`

    for working_file in $file_status_iteration_list
    do 
        # flag p to check if it is current working file 
        p=`cat .shrug/.git/index | cut -d ' ' -f2 | egrep "^$working_file$"`
        # flag q to check if it is in last repo
        q=`cat .shrug/.git/objects/pack/pack-$last_commit_seq.idx | cut -d ' ' -f2 | egrep "^$working_file$"`

        if [ -z "$p" ]; then
            if [ -z "$q" ]; then
                # if not current working and not in last repo
                echo "$working_file - untracked"
            else
                if ! test -f "$working_file"; then
                    # if not current working but in last repo and file not exists
                    echo "$working_file - deleted"
                else
                    # if not current working but in last repo and file exists
                    echo "$working_file - untracked"
                fi
            fi
        else
            if [ -z "$q" ]; then
                staged_file=`cat .shrug/.git/index | egrep " $working_file$" | cut -d' ' -f1`
                if diff -q "$working_file" ".shrug/.git/objects/$staged_file" > /dev/null 2>&1; then
                    # if current working but not in last repo and in current index
                    echo "$working_file - added to index"
                else
                    if test -f "$working_file"; then
                        # if current working but not in last repo and in current index but current file is not the same as the staged one
                        echo "$working_file - added to index, file changed"
                    else
                        # if current working but not in last repo and in current index but current file not exists
                        echo "$working_file - added to index, file deleted"
                    fi
                fi
            else
                if ! test -f "$working_file"; then
                    # both in current index and last repo but file not exists
                    echo "$working_file - file deleted"
                else
                    staged_file=`cat .shrug/.git/index | egrep " $working_file$" | cut -d' ' -f1`
                    last_commit_seq=`cat .shrug/.git/COMMIT_EDITMSG | head -1 | cut -d' ' -f1`
                    repo_file=`cat .shrug/.git/objects/pack/pack-$last_commit_seq.idx | egrep " $working_file$" | cut -d' ' -f1`

                    if diff -q "$working_file" ".shrug/.git/objects/pack/pack-$last_commit_seq.pack/$repo_file" > /dev/null 2>&1; then
                        # working file still in index and nothing changes since last repo
                        echo "$working_file - same as repo"
                    else
                        if diff -q "$working_file" ".shrug/.git/objects/$staged_file" > /dev/null 2>&1; then
                            # working file still in index changes made since last repo and already staged(in index)
                            echo "$working_file - file changed, changes staged for commit"
                        else
                            if diff -q ".shrug/.git/objects/$staged_file" ".shrug/.git/objects/pack/pack-$last_commit_seq.pack/$repo_file" > /dev/null 2>&1; then
                                # working file still in index changes made since last repo and has not staged(not in index)
                                echo "$working_file - file changed, changes not staged for commit"
                            else
                                # working file still in index changes made since last repo and already staged(in index) but working file changes after add operation
                                echo "$working_file - file changed, different changes staged for commit"
                            fi
                        fi
                    fi    
                fi
            fi
        fi
    done
fi