#!/bin/bash

# compare-common: Verifies files in a directory against a
# designated template file (called by compare-dirs)
# Copyright (C) 2009 David Leutzinger (leutzdave @ charter.net)
# /home/david/bin/Website/compare/compare-common
# 2009-08-02 vs 0.2
# 2009-08-11 vs 0.3
# 
# 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 2
# of the License, 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.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

# ----- FUNCTIONS START -----

make_compare_file ()
{
# Define and log the output filename
#echo "make_compare_file function running ..." | tee -a $log_file
echo "source_file = $source_file" >> $log_file
filename=`echo $source_file | rev | cut -d"." -f"2-" | cut -d"/" -f"1" | rev`
compare_file_1A="$log_dir/$filename-begin.txt"
compare_file_1B="$log_dir/$filename-end.txt"
echo "compare_file_1A  = $compare_file_1A" >> $log_file
echo "compare_file_1B  = $compare_file_1B" >> $log_file
content_file_1="$log_dir/$filename-content.txt"
echo "content_file_1  = $content_file_1" >> $log_file

# Determine and log cut_line numbers in source file
# -n, --line-number
#  Prefix each line of output with the 1-based line number within its input file.
cut_line_1=`grep -n "\-\- CONTENT \-\-" $source_file | cut -d":" -f"1"`
cut_line_2=`grep -n "\-\- FOOTER \-\-" $source_file | cut -d":" -f"1"`
echo "cut_line_1   = $cut_line_1" >> $log_file
echo "cut_line_2   = $cut_line_2" >> $log_file

# Determine and log total lines in source file
lines_total=`wc -l $source_file | cut -d" " -f"1"`
echo "lines_total = $lines_total" >> $log_file

# Calculate number of lines for text grabs
head_lines=`expr $cut_line_1 - 1`
tail_lines=`expr $lines_total - $cut_line_2 + 1`
echo "head_lines  = $head_lines" >> $log_file
echo "tail_lines  = $tail_lines" >> $log_file

# Grab the text for comparison file
head -n $head_lines $source_file > $compare_file_1A
tail -n $tail_lines $source_file > $compare_file_1B

# Number the lines of the compare files
nl --body-numbering=a --number-format=rn  "$compare_file_1A" > "$log_dir/temp.txt"
mv "$log_dir/temp.txt" "$compare_file_1A"
nl --body-numbering=a --number-format=rn  "$compare_file_1B" > "$log_dir/temp.txt"
mv "$log_dir/temp.txt" "$compare_file_1B"

# Grab the content section also
lines_center_1=`expr $cut_line_2 - 1`
lines_center_2=`expr $cut_line_2 - $cut_line_1`
echo "lines_center_1  = $lines_center_1" >> $log_file
echo "lines_center_2  = $lines_center_2" >> $log_file
head -n $lines_center_1 $source_file | tail -n $lines_center_2 > $content_file_1

# Number the lines of the content file
nl --body-numbering=a --number-format=rn "$content_file_1" > "$log_dir/temp.txt"
mv "$log_dir/temp.txt" "$content_file_1"

#echo "make_compare_file function completed." | tee -a $log_file
}

# ----- FUNCTIONS END   -----
# ----- MAIN START      -----
# These are passed from the compare_dir menu program
DEV_DIR="$1"
COMPARE_DIR="$2"
STANDARD_FILE="$3"

# NO changes required below this line

# Setup logging directory and log_file
log_dir="/home/david/bin/Website/compare/$COMPARE_DIR"
log_file="$log_dir/Compare.log"

# Clear last logs and start new log
rm $log_dir/*
date=`date`
echo "Run for $DEV_DIR/$COMPARE_DIR started at $date ..." | tee $log_file

# Set-up for and run make_compare_file function
source_file="$DEV_DIR/$COMPARE_DIR/$STANDARD_FILE"
echo "" | tee -a $log_file
echo "PRE-LOOP - Base Compare File = $DEV_DIR/$COMPARE_DIR/$STANDARD_FILE" | tee -a $log_file
make_compare_file

# Save the resultant compare_file name
file_1A="$compare_file_1A"
echo "file_1A = $compare_file_1A" | tee -a $log_file
file_1B="$compare_file_1B"
echo "file_1B = $compare_file_1B" | tee -a $log_file
file_1C="$content_file_1"
echo "file_1C = $content_file_1" | tee -a $log_file
# PAUSE for diagnostic purposes
#read pause

loop_cntr="0"
for i in `ls -1 $DEV_DIR/$COMPARE_DIR/*.html | sort`
do
    loop_cntr=`expr $loop_cntr + 1`
    echo "" | tee -a $log_file
    echo "loop_cntr = $loop_cntr - Processing File $i" | tee -a $log_file
    if [ "$i" = "$DEV_DIR/$COMPARE_DIR/$STANDARD_FILE" ];then
        echo "file_1A = $file_1A (already generated)" | tee -a $log_file
        echo "file_1B = $file_1B (already generated)" | tee -a $log_file
        echo "file_1C = $file_1C (already generated)" | tee -a $log_file
    else
        # Set-up for and run make_compare_file function
        source_file="$i"
        make_compare_file

        # Save the resultant compare_file name
        file_2A="$compare_file_1A"
        echo "file_2A = $compare_file_1A" | tee -a $log_file
        file_2B="$compare_file_1B"
        echo "file_2B = $compare_file_1B" | tee -a $log_file
        file_2C="$content_file_1"
        echo "file_2C = $content_file_1" | tee -a $log_file

        # Perform the compare and log it
        # -b  --ignore-space-change
        #       Ignore changes in the amount of white space.
        # -w  --ignore-all-space
        #       Ignore all white space.
        # -B  --ignore-blank-lines
        #       Ignore changes whose lines are all blank.
        # -y  --side-by-side
        #       Output in two columns.

        diff "$file_1A" "$file_2A" > "$log_dir/diff-$filename-begin.txt"
        echo "DIFF   = $log_dir/diff-$filename-begin.txt" | tee -a $log_file

        diff "$file_1B" "$file_2B" > "$log_dir/diff-$filename-end.txt"
        echo "DIFF   = $log_dir/diff-$filename-end.txt" | tee -a $log_file

        # Note that content files are not compared
    fi

# PAUSE for diagnostic purposes
#read pause

done

# Close out the log
date=`date`
echo "Run ended at $date ..." | tee -a $log_file
# ----- MAIN END        -----