Prototype of thumbnail generation

app/workers/thumbnail_worker.rb

@@ -0,0 +1,29 @@
+require 'tempfile'
+
+class ThumbnailWorker
+  def self.perform(asciicast_id)
+    asciicast = Asciicast.find(asciicast_id)
+
+    in_data_file = Tempfile.new('asciiio-data', :encoding => 'ascii-8bit')
+    in_data_file.write(asciicast.stdout.read)
+    in_data_file.close
+    in_data_path = in_data_file.path
+
+    in_timing_file = Tempfile.new('asciiio-timing', :encoding => 'ascii-8bit')
+    in_timing_file.write(asciicast.stdout_timing.read)
+    in_timing_file.close
+    in_timing_path = in_timing_file.path
+
+    out_data_path = in_data_path + '.ts'
+    out_timing_path = in_timing_path + '.ts'
+
+    if system "bash -c './script/convert-to-typescript.sh #{in_data_path} #{in_timing_path} #{out_data_path} #{out_timing_path}'"
+      delay = (asciicast.duration / 2).to_i
+      command = "scriptreplay #{out_timing_path} #{out_data_path}; sleep 10"
+      puts '-' * 80
+      system "bash -c 'ASCIICAST_ID=#{asciicast_id} COLS=#{asciicast.terminal_columns} LINES=#{asciicast.terminal_lines} COMMAND=\"#{command}\" DELAY=#{delay} THUMB_LINES=10 THUMB_COLS=20 ./script/thumbnail.sh'"
+    else
+      puts "failed"
+    end
+  end
+end

script/convert-to-typescript.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+in_data_file="$1"
+in_timing_file="$2"
+
+out_data_file="$3"
+out_timing_file="$4"
+
+echo '# Foo' >$out_data_file
+bzip2 -c -d $in_data_file >>$out_data_file
+
+(echo 0.0; bzip2 -c -d $in_timing_file | awk '{ print $2; print $1 }' | head -n -1) | xargs -L 2 echo >$out_timing_file

script/thumbnail.sh

@@ -4,6 +4,8 @@
 #   ASCIICAST_ID=666 COLS=80 LINES=20 COMMAND="df; df; df; sleep 10"
 #   DELAY=1 THUMB_LINES=5 THUMB_COLS=10 ./tmux-save.sh
 
+set -e
+
 SESSION_NAME=asciiio-thumb-$ASCIICAST_ID
 
 tmux new -s $SESSION_NAME -d -x $COLS -y $LINES "$COMMAND"