younameit

#!/usr/bin/env bash

#NOTE: This program is free software; you can redistribute it 
#and/or modify it under the terms of the GNU General Public 
#License as published by the Free Software Foundation; either 
#version 3, or (at your option) any later version.

#This program is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#GNU General Public License for more details.

#Bugs can be reported to Yu Zhang <zhang235@mcmaster.ca>.

BEFORE_FILE="younameit.before"
AFTER_FILE="younameit.after"

MV_CMD="mv"
CP_CMD="cp" 
RM_CMD="rm -f"
VIM_CMD="vim"

FLAG_COPY=false
FLAG_FORCE=false
FLAG_QUIET=false

OPTION_VERBOSE="-v"
OPTION_FORCE=""

VERSION="$(basename $0), version 0.12"
USEAGE="usage: $(basename $0) [-hfqC] files_names ... \n
        \n
        \t-h\tshow this help text \n
        \t-v\tshow verion imformation \n
        \t-f\tallow overwriting \n
        \t-q\tquiet mode which suppresses all console messages
"

# check vim
type $VIM_CMD > /dev/null 2>&1 || 
{ 
    echo >&2 "Editor vim is not found. Abort!"
    exit 1
}

# create before and after files
touch $BEFORE_FILE
echo "# before:" > $BEFORE_FILE
touch $AFTER_FILE
echo "# after:" > $AFTER_FILE
if (( 0 != $? )); then
    echo "Cannot create temp files on the current working directory. Abort!"
    exit 1
fi

# parse command line options
while getopts "Cqh?fv" OPTS; do
    case $OPTS in
       C) 
           FLAG_COPY=true
           ;;
       f) 
           FLAG_FORCE=true
           OPTION_FORCE="-f"
           ;;
       q) 
           FLAG_QUIET=true
           OPTION_VERBOSE=""
           ;;
       v) 
           echo $VERSION
           exit 0
           ;;
       h|\?) 
           echo $VERSION
           echo 
           echo -e $USEAGE
           exit 0
           ;;
    esac
done

# handle command line arguments
if (( $# == 0 )); then
    ls -p --hide $BEFORE_FILE --hide $AFTER_FILE | grep -Ev '/' >> $BEFORE_FILE
    ls -p --hide $BEFORE_FILE --hide $AFTER_FILE | grep -Ev '/' >> $AFTER_FILE
else
    for ARG in $@
    do
        if [ "-" == ${ARG:0:1} ]; then continue
        fi

        if [ ! -e $ARG ]; then 
            if [ "true" != $FLAG_QUIET ]; then 
                echo "The file \"$ARG\" does not exist in current directory. Omitted."  
            fi 
        else
            echo $ARG >> $BEFORE_FILE
            echo $ARG >> $AFTER_FILE
        fi
    done
fi

# start vim
$VIM_CMD "-X" \
         "--noplugin" \
         "-c silent set number" \
         "-c silent edit $AFTER_FILE" \
         "-c silent vsplit $BEFORE_FILE" \
         "-c silent wincmd l" \
         "-c silent set nowrap" 

if (( $? != 0 )); then
    echo "Error when exiting vim. Abort!"
    exit 1;
fi

# trim leading and trailing white spaces, blank lines, and lines beginning with the token '#'
#
# vim options
#         "-X"                 do not connect to X server
#         "--noplugin"         do not load plugins
#         "-e" \               start with ex mode
#         "-s" \               silent mode, requires the option '-e' given before
#         "-C" \               compatible (vi) mode 
#         "-c %s/\s\+$//" \    remove trailing white spaces for each line
#         "-c %s/^\s\+//" \    remove leading whit spaces for each line
#         "-c g/^$/d" \        remove blank lines
#         "-c g/^#/d" \        remove '#' lines
#         "-c wq"              write buffer and quite
$VIM_CMD $BEFORE_FILE \
         "-X" \
         "--noplugin" \
         "-e" \
         "-s" \
         "-C" \
         "-c %s/\s\+$//" \
         "-c %s/^\s\+//" \
         "-c g/^$/d" \
         "-c g/^#/d" \
         "-c wq"
BEFORE_LINE_NUMBER=$(wc -l $BEFORE_FILE | cut -d" " -f1)

$VIM_CMD $AFTER_FILE \
         "-X" \
         "--noplugin" \
         "-e" \
         "-s" \
         "-C" \
         "-c %s/\s\+$//" \
         "-c %s/^\s\+//" \
         "-c g/^$/d" \
         "-c g/^#/d" \
         "-c wq"
AFTER_LINE_NUMBER=$(wc -l $AFTER_FILE | cut -d" " -f1)

if [ $BEFORE_LINE_NUMBER == $AFTER_LINE_NUMBER ]; then
    exec 6<$BEFORE_FILE
    while read -r AFTER_LINE; do
        read -r BEFORE_LINE <&6
        if [ ! -e $BEFORE_LINE ]; then
            if [ "true" != $FLAG_QUIET ]; then 
                echo "Source file \"$BEFORE_LINE\" does not exist in current directory."
                echo "Omit current file!"
            fi
            continue
        fi
        if [ -e $AFTER_LINE ]; then
            if [ "true" != $FLAG_QUIET ]; then 
                echo "Target file \"$AFTER_LINE\" already exists in current directory."
            fi
            if [ "false" == $FLAG_FORCE ]; then
                if [ "true" != $FLAG_QUIET ]; then 
                    echo "No action is performed for \"$BEFORE_LINE\"!"
                fi
                continue
            else
                if [ "true" != $FLAG_QUIET ]; then 
                    echo "Target file \"$AFTER_LINE\" is overwritten by \"$BEFORE_LINE\"!"
                fi
            fi
        fi

        if [ "true" == $FLAG_COPY ]; then
            $CP_CMD $OPTION_VERBOSE $OPTION_FORCE $BEFORE_LINE $AFTER_LINE
        else
            $MV_CMD $OPTION_VERBOSE $OPTION_FORCE $BEFORE_LINE $AFTER_LINE
        fi

    done <$AFTER_FILE
else
    echo "Line mismatching in files. Abort!"
    exit 1
fi

if [ "true" != $FLAG_QUIET ]; then 
    echo "Removing temporary files ..."
fi
$RM_CMD $OPTION_VERBOSE $AFTER_FILE $BEFORE_FILE
if [ "true" != $FLAG_QUIET ]; then 
    echo "All set !"
fi
exit 0