idempotent BDF to TTF conversion (no timestamps)

https://github.com/kreativekorp/bitsnpicas/issues/35

Dockerfile

@@ -7,6 +7,9 @@ RUN apt-get install -y locales \
  && sed -i "s/^# $LANG/$LANG/" /etc/locale.gen \
  && locale-gen
 
+# for BitsNPicas
+RUN apt-get install -y openjdk-11-jdk-headless
+
 # for bitmap-font-patcher
 RUN apt-get install -y python python-fontforge python-pip python-dev libfreetype6-dev
 RUN pip install bdflib Pillow

README.md

@@ -267,7 +267,7 @@ You can build the Tamzen fonts for yourself by running these commands:
 But first, you'll need to install these dependencies (assuming Debian):
 
     # NOTE: the "xfonts-utils" package provides both bdftopcf(1) and fonttosfnt(1)
-    sudo apt-get install ruby git imagemagick xfonts-utils bdf2psf default-jre gbdfed
+    sudo apt-get install ruby git imagemagick xfonts-utils bdf2psf default-jre gbdfed openjdk-11-jdk-headless
     gem install bundler -v 2.3.26
     bundle install
 

Rakefile

@@ -287,7 +287,7 @@ CLOBBER.include %w[ .opentype otb ]
 
 directory 'ttf'
 desc 'Build Tamzen fonts in TrueType (TTF) format.'
-file '.truetype' => %w[ ttf .bitmap bitsnpicas/downloads/BitsNPicas.jar ] do |t|
+file '.truetype' => %w[ ttf .bitmap bitsnpicas/main/java/BitsNPicas/BitsNPicas.jar ] do |t|
   FileList['bdf/Tamzen*.bdf'].each do |src|
     dst = src.gsub('bdf', 'ttf')
     sh 'java', '-jar', t.prerequisites.last,
@@ -297,8 +297,14 @@ file '.truetype' => %w[ ttf .bitmap bitsnpicas/downloads/BitsNPicas.jar ] do |t|
 end
 CLOBBER.include %w[ .truetype ttf ]
 
-file 'bitsnpicas/downloads/BitsNPicas.jar' do
-  sh 'git', 'clone', 'https://github.com/kreativekorp/bitsnpicas'
+file 'bitsnpicas/main/java/BitsNPicas/BitsNPicas.jar' do
+  sh 'git', 'clone', 'https://github.com/sunaku/bitsnpicas'
+  cd 'bitsnpicas' do
+    sh 'git', 'checkout', 'timeless'
+    cd 'main/java/BitsNPicas' do
+      sh 'make', 'BitsNPicas.jar'
+    end
+  end
 end
 
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