git-subwiz

#!/bin/bash

action=$1

dependencies_file="$(pwd)/dependencies.txt"

print_usage () {
    echo -e "Usage:
        Importing:
             $ git subwiz import
             Imports all subtrees listed in dependencies.txt

        Updating:
             $ git subwiz update
             Updates all subtrees listed in dependencies.txt

        Listing:
            $ git subwiz list
            Lists all subtrees and its changed time listed in dependencies.txt

        Removing:
            $ git subwiz remove
            WARNING! Removes all subtrees from repository listed in dependencies.txt
            "
    exit
}


initial_check() {
    set -e
    test -f "$dependencies_file" || (echo "Cannot find dependencies.txt in this repository!"; exit 1)
    test -s "$dependencies_file" || (echo "File dependencies.txt is empty!"; exit 1)
}


import_subtrees() {

    set +e
    trap "echo SOMETHING GOES WRONG WHILE IMPORTING! SEE ERRORS ABOVE" ERR

    while IFS='' read -r line; do

        ( [ -z "$line" ] || grep -q -e '^#' <<< "$line") && continue

        # Remove both leading and trailing spaces, change spaces inside repo_name and repo_prefix to "_"
        repo_name=$(echo "$line" | awk -F";" '{print $1}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')
        repo_url=$(echo "$line" | awk -F";" '{print $2}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
        repo_prefix=$(echo "$line" | awk -F";" '{print $3}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')

        echo -e "IMPORTING $repo_name FROM $repo_url..."
        git remote add "$repo_name" "$repo_url"
        git fetch -q "$repo_name"
        test -d "$repo_prefix" || mkdir "$repo_prefix"
        git subtree -q add --prefix="$repo_prefix"/"$repo_name" "$repo_name" develop || \
                                                                        (echo "COMMIT YOUR CHANGES BEFORE IMPORT SUBTREE!")
    done < "$dependencies_file"
}


update_subtrees () {

    set +e
    trap "echo SOMETHING GOES WRONG WHILE UPDATING! SEE ERRORS ABOVE" ERR

    while IFS='' read -r line; do

        ( [ -z "$line" ] || grep -q -e '^#' <<< "$line") && continue
        
        # Remove both leading and trailing spaces, change spaces inside repo_name and repo_prefix to "_"
        repo_name=$(echo "$line" | awk -F";" '{print $1}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')
        repo_prefix=$(echo "$line" | awk -F";" '{print $3}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')

        if test -d "$repo_prefix"/"$repo_name"; then    
            echo -e "UPDATING $repo_name..."
            ( git subtree pull --prefix="$repo_prefix" "$repo_name" develop &&
            echo -e "$repo_name SUCCESSFULLY UPDATED!" ) || (echo "CANNOT UPDATE $repo_name!")
        else
            echo -e "YOU MUST IMPORT $repo_name BEFORE UPDATING IT!"
        fi
    done < "$dependencies_file"
}


list_subtrees () {
    echo -e "IMPORTED SUBTREES FOUND:"
    git remote | while IFS='' read -r line; do
            if [ "$line" == "origin" ]; then continue; fi
            subtree="$line"
            last_change=$(git log --grep=git-subtree-dir --date=format:'[%d.%m.%Y %H:%M]' --pretty=format:"%ad%s"| grep "${subtree}"| head -1| grep -o -e '^\[.*\]')
            echo -e "$subtree (last change: $last_change)"
    done
}


remove_subtrees () {

    set +e
    trap "echo SOMETHING GOES WRONG WHILE REMOVING! SEE ERRORS ABOVE" ERR

    while IFS='' read -r line; do

        ( [ -z "$line" ] || grep -q -e '^#' <<< "$line" ) && continue

        # Remove both leading and trailing spaces, change spaces inside repo_name and repo_prefix to "_"
        repo_name=$(echo "$line" | awk -F";" '{print $1}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')
        repo_prefix=$(echo "$line" | awk -F";" '{print $3}' | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//' | tr ' ' '_')

        echo -e "DELETING $repo_name FROM CURRENT PROJECT..."
        git remote remove "$repo_name"
        ( test -d "$repo_prefix"/"$repo_name" && rm -rf "$repo_prefix"/"$repo_name" )
        git rm -q -rf "$repo_prefix"/"$repo_name"
        echo -e "REPOSITORY REMOVED. COMMIT THESE CHANGES."

    done < "$dependencies_file"
}


[ -z "$action" ] && print_usage

case $action in

    import)
        initial_check
        import_subtrees
        ;;

    update)
        initial_check
        update_subtrees
        ;;

    list)
        list_subtrees
        ;;

    remove)
        initial_check
        remove_subtrees
        ;;

    *)
        print_usage
        ;;
esac