#!/usr/bin/env bash
#
# This file is part of the LibreOffice project.
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#

# add-modelines, a simple script to add comments to
# the beginning and end of source files for LibreOffice devs

# Blame goes to Jesse Adelman (at least at first)
# someone AT boldandbusted dotty-dot com
# http://www.boldandbusted.com/
# (c) 2010 Bold and Busted LLC

# NOTE: At present, this script only works for files with C-like comments.
# NOTE: If you don't specify -p, the script will act on the current working directory.
# NOTE: If no arguments are specified, the definitions below are in effect.

# TO DO
#  - Deuglify?
#  - Make source file type agnostic modelines?
#  - Too many/too few comments?
#  - Handle top level source directories with whitespace names? (Do they exist?)

# Turn off globbing, helps with SourceFiles
set -f

# POSIX
set -o posix

# Change these to taste
FirstLine='/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */'
LastLine='/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */'
SourceFiles='*.cxx *.cpp *.hxx *.hpp *.c *.h *.m *.mm *.idl *.src *.hrc'

# Set defaults (don't change these)
ModelineReplace="false"

# Functions

function SetEnvironment()
{
    if ! command -v tail || ! command -v head; then
        echo "Missing head or tail, exiting..."
        exit 1
    fi
    if ! command -v find; then
        echo "Missing find, exiting..."
        exit 1
    fi
}

function EditFile()
{
    local FileToEdit
    local currentFirstLine
    local currentLastLine

    FileToEdit="$1"

    currentFirstLine=$(head -1 "$FileToEdit")
    currentLastLine=$(tail -1 "$FileToEdit")

    case "$ModelineReplace" in
        "true" )
            if [ "${currentFirstLine:0:6}" = "${FirstLine:0:6}" ]; then
            {
                echo "$FirstLine" > "$FileToEdit".new
                tail -n +2 "$FileToEdit" >> "$FileToEdit".new
            }
            fi
            if [ -e "$FileToEdit.new" ]; then
            {
                echo "$LastLine" >> "$FileToEdit".new
            }
            fi
            if [ "${currentLastLine:0:6}" = "${LastLine:0:6}" ]; then
            {
                head -n -1 "$FileToEdit" > "$FileToEdit".new
                echo "$LastLine" >> "$FileToEdit".new
            }
            fi
            mv "$FileToEdit".new "$FileToEdit"
            echo "$FileToEdit updated" ;;
        "false" )
            if [ "${currentFirstLine:0:6}" != "${FirstLine:0:6}" ]; then
                if [ "${currentLastLine:0:6}" != "${LastLine:0:6}" ]; then
                {
                    echo "$FirstLine" > "$FileToEdit".new
                    cat "$FileToEdit" >> "$FileToEdit".new
                    if [ "x${currentLastLine}" != "x" ] ; then
                        echo "" >> "$FileToEdit".new
                    fi
                    echo "$LastLine" >> "$FileToEdit".new
                    mv "$FileToEdit".new "$FileToEdit"
                    echo "$FileToEdit updated"
                }
                fi
            fi ;;
    esac
}

function PrintUsage()
{
    echo "Usage: $0 [-z] [-s \"<sourcefile glob>\"] [-p <path to source>]"
}

# Main

SetEnvironment

# Get command line options

while getopts "zs:p:" opt; do
    case $opt in
        z) ModelineReplace="true" ;;
        s) SourceFiles="$OPTARG" ;;
        p) findPath="$OPTARG" ;;
        *) PrintUsage
           exit 1 ;;
    esac
done

if [ $OPTIND -gt 1 ]; then
    shift $((OPTIND - 1))
fi

if [ $# -gt 1 ]; then
{
    PrintUsage
    echo "Remember to quote the source file globs after -s"
    exit 1
}
fi

# Create GNU find expressions that traverse the filesystem once and only once
if [ -z "$findPath" ]; then
    findArgs='.'
    else
        findArgs="$findPath"
fi

for FileType in ${SourceFiles}; do
    findArgs="$findArgs"' ( -iname '"$FileType"' -print -o -true ) -a '
done

# This gets rid of the final " -a " in the find argument list
findArgs=(${findArgs:0:(${#findArgs}-3)})

for file in $(find "${findArgs[@]}"); do
    EditFile "$file"
    echo "Completed: " "$file"
done

# vim:set shiftwidth=4 softtabstop=4 expandtab: