bash_functions

#!/bin/bash

#
# location of _repos.txt file
# (example at https://gist.github.com/danhaywood/938f0f751f756b1cfd6a9751b8779407)
#

#PREFIX="/mnt"
PREFIX=""

DEV_HOME="$PREFIX/c/dev"

_foreach_usage()
{
    cat << EOF

usage: $0 options command

Runs the specified command for all uncommented lines in _repos.txt file
(or as specified by -f flag)

OPTIONS:
   -f [file]     file to read from (defaults to _repos.txt)
   -c            continue if exception encountered
   -g [grep]     filter (grep) the input file, using expression
   
EXAMPLES:
    foreach git status
    foreach git diff
    foreach git fetch
    foreach -g isisaddons git fetch
    foreach -c git pull --ff-only
    foreach mvn clean install -o
    foreach mvn clean install -o -DskipTests=true
    foreach git add .
    foreach git push origin master

EOF
}

foreach() {

    local OPTIND continue_on_error grep_expression file

    file="$DEV_HOME/_repos.txt"
    grep_expression=".*"
    continue_on_error=1

    while getopts "f:g:c" OPT; do
        case "$OPT" in
            f) file=$OPTARG
               ;;
            g) grep_expression=$OPTARG
               ;;
            c) continue_on_error=0
               ;;
            *)
               _foreach_usage
               return 1
               ;;
        esac
    done
    shift $((OPTIND-1))
    cmd="$*"

    if [ "$cmd" == "" ]; then
        _foreach_usage
        return 1
    fi

    echo ""
    echo "cmd: $cmd"
    echo ""

    for a in `cat $file | \
              grep "$grep_expression" | \
              grep -v ^# `
    do
        echo ""
        pushd $a  >/dev/null
        if [ $? != 0 ]; then
            echo "" >&2
            echo "">&2
            echo "bad directory: $a" >&2
            echo "">&2
            return 1
        fi
        echo ""
        pwd
        eval "$cmd"
        if [ $? != 0 ]; then
            if [ $continue_on_error == 0 ]; then
                echo "" >&2
                echo "cmd failed: $exec" >&2
                echo "" >&2
                popd >/dev/null
                return 1
            fi
        fi
        popd >/dev/null
    done
    echo ""
    echo ""
    echo "DONE"
    echo ""

}

###############################################################






_repo_usage()
{
cat << EOF

usage: $0 options repo

Switches to the specified repository as listed in the _repos.txt file
(or as specified by -f flag)

OPTIONS:
   -f [file]     file to read from (defaults to _repos.txt)
   [repo]        identify (using regexp) the repo from input file
   
EXAMPLES:
    repo classific
    repo command

EOF
}

repo() {

    local OPTIND grep_expression file
    file="$DEV_HOME/_repos.txt"

    while getopts "f:" OPT; do
        case "$OPT" in
            f) file=$OPTARG
               ;;
            *)
                _repo_usage
                return 1
                ;;
        esac
    done
    shift $((OPTIND-1))
    grep_expression="$*"

    if [ "Z${grep_expression}Z" == "ZZ" ]; then
        _repo_usage
        return 1
    fi

    for a in `cat $file | \
              grep "$grep_expression" | \
              grep -v ^# `
    do
        echo $a
    done

    for a in `cat $file | \
              grep "$grep_expression" | \
              grep -v ^# `
    do
        pushd $a >/dev/null
        if [ $? != 0 ]; then
            echo "" >&2
            echo "">&2
            echo "bad directory: $a" >&2
            echo "">&2
            return 1
        fi
        return 0
    done
}