check-links

#!/bin/sh
# (c) Copyright 2017 Jonathan Simmonds
# Simple application to confirm the validity of symlinks in a directory.
set -e

usage()
{
    echo "usage: check-links [-p] [-h] [directory]"
    echo ""
    echo "Simple application to confirm the validity of symlinks in a directory."
    echo ""
    echo "positional arguments:"
    echo "  directory   Optional directory to search in. If ommitted the current"
    echo "              working directory is used."
    echo ""
    echo "optional arguments:"
    echo "  -p          Run in script mode, outputing just the name of all"
    echo "              broken links to stdout. In interactive mode (default)"
    echo "              output is decorated."
    echo "  -h, --help  Print this message and exit."
    exit 1
}

# Script variables
SCRIPT_MODE=false
DIRECTORY="."

# Handle command line
while [ $# -gt 0 ]; do
    command_line_arg="$1"
    shift
    case "$command_line_arg" in
        -p)
            SCRIPT_MODE=true
            ;;
        -h)
            usage
            ;;
        --help)
            usage
            ;;
        *)
            DIRECTORY="$command_line_arg"
            ;;
    esac
done

# Actual implementation
DIR_FILES=$(find "$DIRECTORY" -maxdepth 1 -print)
RET=0
for f in $DIR_FILES; do
    if [ ! -f $(readlink "$f") ]; then
        RET=1
        if [ $SCRIPT_MODE = true ]; then
            echo "$f"
        else
            echo "WARNING: link '$f' is broken."
        fi
    fi
done

exit $RET