install-android-dev-scripts-to

#!/bin/bash
# Copyright (C) 2012 Texas Instruments
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Author: Gabriel M. Beddingfield <gabrbedd@ti.com>
#
# DESCRIPTION OF install-android-dev-scripts-to
# ---------------------------------------------
#
# Installs all of the scripts in this project to the folder of your
# choosing (HINT: ~/bin).  It does not copy, but instead symlinks.
#

THIS_SCRIPT=install-android-dev-scripts-to
VERBOSE="no"
DRYRUN="no"
PWD="$(pwd)"
MODE="install"

function die()
{
    if [ ! -z "$1" ] ; then
	echo "$1"
    fi
    exit 1
}

function usage()
{
cat <<EOF
Usage: $THIS_SCRIPT <dest-folder> [-d|-v|-u]
    <dest-folder> should be in your \$PATH
    -d don't actually do anything (dry run)
    -v verbose messages
    -u don't install... uninstall
EOF
}

function log_v()
{
    if [ "$VERBOSE" == "yes" ] ; then
	echo "$@"
    fi
}

# args: src dest dryrun:(yes|no)
function install_to()
{
    if [ $# -ne 3 ] ; then
	echo "Internal error: install_to() expects 3 args, but only given $# ($@)"
	exit
    fi
    SRC="$1"
    BASENAME=$(basename "$SRC")
    DEST="$2/$BASENAME"
    DRYRUN="$3"

    if [ -e "$DEST" ] ; then
	uninstall_from "$@"
    fi

    log_v "Linking $DEST -> $SRC"
    if [ "$DRYRUN" != "yes" ] ; then
	ln -s "$SRC" "$DEST" || die "Error: could not create link"
    fi

    return 0
}

# args: src dest dryrun:(yes|no)
function uninstall_from()
{
    if [ $# -ne 3 ] ; then
	echo "Internal error: install_to() expects 3 args, but only given $# ($@)"
	exit
    fi
    SRC="$1"
    BASENAME=$(basename "$SRC")
    DEST="$2/$BASENAME"
    DRYRUN="$3"

    if [ -e "$DEST" ] ; then
	if [ -L "$DEST" ] ; then
	    log_v "removing symlink $DEST"
	    if [ "$DRYRUN" != "yes" ] ; then
		rm "$DEST" || die "Error: could not remove $DEST"
	    fi
	else
	    echo "Error: $DEST exists but is not a symlink (skipping)"
	    return 0
	fi
    fi

    return 0
}

#
# main logic
#

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

#
# Process args
#

DESTFOLDER="$1"
shift

while [ $# -ne 0 ] ; do
    case "$1" in
	"-d") DRYRUN="yes" ;;
	"-v") VERBOSE="yes" ;;
	"-u") MODE="uninstall" ;;
	*) die "Unsupported option '$1'" ;;
    esac
    shift
done

if [ "$2" == "-d" ] ; then
    DRYRUN="yes"
fi

if [ ! -d "$DESTFOLDER" ] ; then
    echo "Error: '$DESTFOLDER' does not exist or is not a directory"
    exit 1
fi

for N in "$PWD"/* ; do
    if [ "$N" == "$PWD/$THIS_SCRIPT" ] ; then
	continue
    fi

    if [ \( -f "$N" \) -a \( -x "$N" \) ] ; then
	if [ "$MODE" == "install" ] ; then
	    install_to "$N" "$DESTFOLDER" "$DRYRUN"
	else
	    uninstall_from "$N" "$DESTFOLDER" "$DRYRUN"
	fi
    fi
done