Update optimize_png_files.sh to work on msysgit bash.

This bash is moderately archaic (version 3), and various tools (e.g. tput) are
missing.

This also modifies the ouput of the script so that in verbose mode, as it runs,
each filename is trimmed to fit on one line, including the throbber, then
replaced by the full filename when printing the final file status.  This makes
for a cleaner output spew with long filenames in particular.

BUG=none
TEST=none
R=oshima@chromium.org

Review URL: https://codereview.chromium.org/291153007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272364 0039d316-1c4b-4281-b951-d872f2087c98

tools/resources/optimize-png-files.sh

-#!/bin/bash
+#!/bin/bash -i
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
@@ -54,11 +54,11 @@ PROCESSED_FILE=0
 declare -a THROBBER_STR=('-' '\\' '|' '/')
 THROBBER_COUNT=0
 
-VERBOSE=0
+VERBOSE=false
 
 # Echo only if verbose option is set.
 function info {
-  if [ $VERBOSE -eq 1 ]; then
+  if $VERBOSE ; then
     echo $@
   fi
 }
@@ -66,7 +66,8 @@ function info {
 # Show throbber character at current cursor position.
 function throbber {
   info -ne "${THROBBER_STR[$THROBBER_COUNT]}\b"
-  let THROBBER_COUNT=($THROBBER_COUNT+1)%4
+  let THROBBER_COUNT=$THROBBER_COUNT+1
+  let THROBBER_COUNT=$THROBBER_COUNT%4
 }
 
 # Usage: pngout_loop <file> <png_out_options> ...
@@ -77,13 +78,13 @@ function pngout_loop {
   shift
   local opts=$*
   if [ $OPTIMIZE_LEVEL == 1 ]; then
-    for j in $(seq 0 5); do
+    for j in $(eval echo {0..5}); do
       throbber
       pngout -q -k1 -s1 -f$j $opts $file
     done
   else
     for i in 0 128 256 512; do
-      for j in $(seq 0 5); do
+      for j in $(eval echo {0..5}); do
         throbber
         pngout -q -k1 -s1 -b$i -f$j $opts $file
       done
@@ -106,7 +107,7 @@ function get_color_depth_list {
 #
 # TODO(oshima): Experiment with -d0 w/o -c0.
 function process_grayscale {
-  info -n "|gray"
+  info -ne "\b\b\b\b\b\b\b\bgray...."
   for opt in $(get_color_depth_list); do
     pngout_loop $file -c0 $opt
   done
@@ -115,7 +116,7 @@ function process_grayscale {
 # Usage: process_grayscale_alpha <file>
 # Optimize grayscale images with alpha for all color bit depths.
 function process_grayscale_alpha {
-  info -n "|gray-a"
+  info -ne "\b\b\b\b\b\b\b\bgray-a.."
   pngout_loop $file -c4
   for opt in $(get_color_depth_list); do
     pngout_loop $file -c3 $opt
@@ -125,7 +126,7 @@ function process_grayscale_alpha {
 # Usage: process_rgb <file>
 # Optimize rgb images with or without alpha for all color bit depths.
 function process_rgb {
-  info -n "|rgb"
+  info -ne "\b\b\b\b\b\b\b\brgb....."
   for opt in $(get_color_depth_list); do
     pngout_loop $file -c3 $opt
   done
@@ -136,8 +137,8 @@ function process_rgb {
 # Usage: huffman_blocks <file>
 # Optimize the huffman blocks.
 function huffman_blocks {
+  info -ne "\b\b\b\b\b\b\b\bhuffman."
   local file=$1
-  info -n "|huffman"
   local size=$(stat -c%s $file)
   local min_block_size=$DEFAULT_MIN_BLOCK_SIZE
   local limit_blocks=$DEFAULT_LIMIT_BLOCKS
@@ -151,7 +152,7 @@ function huffman_blocks {
     max_blocks=$limit_blocks
   fi
 
-  for i in $(seq 2 $max_blocks); do
+  for i in $(eval echo {2..$max_blocks}); do
     throbber
     pngout -q -k1 -ks -s1 -n$i $file
   done
@@ -163,7 +164,7 @@ function huffman_blocks {
 # TODO(oshima): Try adjusting different parameters for large files to
 # reduce runtime.
 function random_huffman_table_trial {
-  info -n "|random"
+  info -ne "\b\b\b\b\b\b\b\brandom.."
   local file=$1
   local old_size=$(stat -c%s $file)
   local trials_count=$DEFAULT_RANDOM_TRIALS
@@ -171,7 +172,7 @@ function random_huffman_table_trial {
   if [ $old_size -gt $LARGE_FILE_THRESHOLD ]; then
     trials_count=$LARGE_RANDOM_TRIALS
   fi
-  for i in $(seq 1 $trials_count); do
+  for i in $(eval echo {1..$trials_count}); do
     throbber
     pngout -q -k1 -ks -s0 -r $file
   done
@@ -185,7 +186,7 @@ function random_huffman_table_trial {
 # Further compress using optipng and advdef.
 # TODO(oshima): Experiment with 256.
 function final_compression {
-  info -n "|final"
+  info -ne "\b\b\b\b\b\b\b\bfinal..."
   local file=$1
   if [ $OPTIMIZE_LEVEL == 2 ]; then
     for i in 32k 16k 8k 4k 2k 1k 512; do
@@ -193,21 +194,25 @@ function final_compression {
       optipng -q -nb -nc -zw$i -zc1-9 -zm1-9 -zs0-3 -f0-5 $file
     done
   fi
-  for i in $(seq 1 4); do
+  for i in $(eval echo {1..4}); do
     throbber
     advdef -q -z -$i $file
   done
-  info -ne "\r"
+
+  # Clear the current line.
+  if $VERBOSE ; then
+    printf "\033[0G\033[K"
+  fi
 }
 
 # Usage: get_color_type <file>
 # Returns the color type name of the png file. Here is the list of names
 # for each color type codes.
-# 0 : grayscale
-# 2 : RGB
-# 3 : colormap
-# 4 : gray+alpha
-# 6 : RGBA
+# 0: grayscale
+# 2: RGB
+# 3: colormap
+# 4: gray+alpha
+# 6: RGBA
 # See http://en.wikipedia.org/wiki/Portable_Network_Graphics#Color_depth
 # for details about the color type code.
 function get_color_type {
@@ -218,9 +223,17 @@ function get_color_type {
 # Usage: optimize_size <file>
 # Performs png file optimization.
 function optimize_size {
-  tput el
+  # Print filename, trimmed to ensure it + status don't take more than 1 line
+  local filename_length=${#file}
+  local -i allowed_length=$COLUMNS-11
+  local -i trimmed_length=$filename_length-$COLUMNS+14
+  if [ "$filename_length" -lt "$allowed_length" ]; then
+    info -n "$file|........"
+  else
+    info -n "...${file:$trimmed_length}|........"
+  fi
+
   local file=$1
-  info -n "$file "
 
   advdef -q -z -4 $file
 
@@ -239,7 +252,7 @@ function optimize_size {
     fi
   fi
 
-  info -n "|filter"
+  info -ne "\b\b\b\b\b\b\b\bfilter.."
   local old_color_type=$(get_color_type $file)
   optipng -q -zc9 -zm8 -zs0-3 -f0-5 $file -out $file.tmp.png
   local new_color_type=$(get_color_type $file.tmp.png)
@@ -248,9 +261,8 @@ function optimize_size {
   # the bug is fixed. See crbug.com/174505, crbug.com/174084.
   # The issue is reported in
   # https://sourceforge.net/tracker/?func=detail&aid=3603630&group_id=151404&atid=780913
-  if [[ $old_color_type == "RGBA" && $new_color_type =~ gray.* ]] ; then
+  if [[ $old_color_type == "RGBA" && $new_color_type == gray* ]] ; then
     rm $file.tmp.png
-    info -n "[skip opting]"
   else
     mv $file.tmp.png $file
   fi
@@ -259,7 +271,7 @@ function optimize_size {
   huffman_blocks $file
 
   # TODO(oshima): Experiment with strategy 1.
-  info -n "|strategy"
+  info -ne "\b\b\b\b\b\b\b\bstrategy"
   if [ $OPTIMIZE_LEVEL == 2 ]; then
     for i in 3 2 0; do
       pngout -q -k1 -ks -s$i $file
@@ -280,7 +292,7 @@ function process_file {
   local file=$1
   local name=$(basename $file)
   # -rem alla removes all ancillary chunks except for tRNS
-  pngcrush -d $TMP_DIR -brute -reduce -rem alla $file > /dev/null
+  pngcrush -d $TMP_DIR -brute -reduce -rem alla $file > /dev/null 2>&1
 
   if [ -f $TMP_DIR/$name -a $OPTIMIZE_LEVEL != 0 ]; then
     optimize_size $TMP_DIR/$name
@@ -301,26 +313,28 @@ function optimize_file {
 
   process_file $file
 
-  if [ ! -e  $tmp_file ] ; then
+  if [ ! -e $tmp_file ] ; then
     let CORRUPTED_FILE+=1
-    echo "The png file ($file) may be corrupted. skipping"
+    echo "$file may be corrupted; skipping\n"
     return
   fi
 
   local new=$(stat -c%s $tmp_file)
   let diff=$old-$new
-  let percent=($diff*100)/$old
+  let percent=$diff*100
+  let percent=$percent/$old
 
-  tput el
   if [ $new -lt $old ]; then
-    echo -ne "$file : $old => $new ($diff bytes : $percent %)\n"
-    mv "$tmp_file" "$file"
+    info "$file: $old => $new ($diff bytes: $percent%)"
+    cp "$tmp_file" "$file"
     let TOTAL_OLD_BYTES+=$old
     let TOTAL_NEW_BYTES+=$new
     let PROCESSED_FILE+=1
   else
     if [ $OPTIMIZE_LEVEL == 0 ]; then
-      info -ne "$file : skipped\r"
+      info "$file: Skipped"
+    else
+      info "$file: Unable to reduce size"
     fi
     rm $tmp_file
   fi
@@ -400,6 +414,19 @@ else
   using_cygwin=false
 fi
 
+# The -i in the shebang line should result in $COLUMNS being set on newer
+# versions of bash.  If it's not set yet, attempt to set it.
+if [ -z $COLUMNS ]; then
+  which tput > /dev/null 2>&1
+  if [ "$?" == "0" ]; then
+    COLUMNS=$(tput cols)
+  else
+    # No tput either... give up and just guess 80 columns.
+    COLUMNS=80
+  fi
+  export COLUMNS
+fi
+
 OPTIMIZE_LEVEL=1
 # Parse options
 while getopts o:r:h:v opts
@@ -413,13 +440,13 @@ do
       fi
       ;;
     o)
-      if [[ ! "$OPTARG" =~ [012] ]] ; then
+      if [[ "$OPTARG" != 0 && "$OPTARG" != 1 && "$OPTARG" != 2 ]] ; then
         show_help
       fi
       OPTIMIZE_LEVEL=$OPTARG
       ;;
     v)
-      let VERBOSE=1
+      VERBOSE=true
       ;;
     [h?])
       show_help;;
@@ -455,7 +482,7 @@ if $using_cygwin ; then
 fi
 
 # Make sure we cleanup temp dir
-trap "rm -rf $TMP_DIR" EXIT
+#trap "rm -rf $TMP_DIR" EXIT
 
 # If no directories are specified, optimize all directories.
 DIRS=$@
@@ -489,17 +516,13 @@ else
 fi
 
 # Print the results.
-if [ $PROCESSED_FILE == 0 ]; then
-  echo "Did not find any files (out of $TOTAL_FILE files)" \
-       "that could be optimized" \
-       "in $(date -u -d @$SECONDS +%T)s"
-else
+echo "Optimized $PROCESSED_FILE/$TOTAL_FILE files in" \
+     "$(date -d "0 + $SECONDS sec" +%Ts)"
+if [ $PROCESSED_FILE != 0 ]; then
   let diff=$TOTAL_OLD_BYTES-$TOTAL_NEW_BYTES
   let percent=$diff*100/$TOTAL_OLD_BYTES
-  echo "Processed $PROCESSED_FILE files (out of $TOTAL_FILE files)" \
-       "in $(date -u -d @$SECONDS +%T)s"
-  echo "Result : $TOTAL_OLD_BYTES => $TOTAL_NEW_BYTES bytes" \
-       "($diff bytes : $percent %)"
+  echo "Result: $TOTAL_OLD_BYTES => $TOTAL_NEW_BYTES bytes" \
+       "($diff bytes: $percent%)"
 fi
 if [ $CORRUPTED_FILE != 0 ]; then
   echo "Warning: corrupted files found: $CORRUPTED_FILE"