Add the ability to add woff2 files to the docker

Summary:
To complement pull request #142, add the ability to automatically
generate the woff2 files from within the docker. Add a script for copying out
the generated font files to make things easier. Remove the KaTeX_Greek font
files as well as the KaTeX_Win ones, since we don't use them and they're oddly
non-woff and non-eot specific?

Test Plan:
 - Build a new docker from the new Dockerfile
  - Make sure the woff2_compress program compiles
 - Follow the instructions in the README to build the fonts
  - Make sure the fonts correctly build
  - Make sure the copy_fonts.sh script copies the fonts out

Reviewers: alpert

Reviewed By: alpert

Differential Revision: http://phabricator.khanacademy.org/D13637

dockers/MathJaxFonts/Dockerfile

@@ -3,7 +3,7 @@ MAINTAINER xymostech <xymostech@gmail.com>
 
 # Install things
 RUN apt-get -qq update
-RUN apt-get -qqy install git dvipng default-jre default-jdk texlive wget fontforge mftrace fonttools optipng advancecomp man-db build-essential unzip zlib1g-dev python-fontforge ruby || true
+RUN apt-get -qqy install git dvipng default-jre default-jdk texlive wget fontforge mftrace fonttools optipng advancecomp man-db build-essential unzip zlib1g-dev python-fontforge ruby woff-tools || true
 RUN gem install ttfunk --version 1.1.1
 
 # Download yuicompressor
@@ -22,11 +22,10 @@ RUN sed -i "1s/^/#include <cstddef>/" ttf2eot-0.0.2-2/OpenTypeUtilities.h
 RUN make -C ttf2eot-0.0.2-2/
 RUN mv ttf2eot-0.0.2-2/ttf2eot /usr/bin/
 
-# Download and compile sfnt2woff
-RUN wget "http://people.mozilla.org/~jkew/woff/woff-code-latest.zip"
-RUN unzip -d sfnt2woff woff-code-latest.zip
-RUN make -C sfnt2woff
-RUN mv sfnt2woff/sfnt2woff /usr/bin/
+# Download and compile woff2_compress
+RUN git clone "https://code.google.com/p/font-compression-reference/" woff2_compress
+RUN make -C woff2_compress/woff2/
+RUN mv woff2_compress/woff2/woff2_compress /usr/bin/
 
 # Download and setup MathJax-dev
 RUN git clone "https://github.com/khan/MathJax-dev.git"

dockers/MathJaxFonts/README.md

@@ -23,26 +23,15 @@ or use a different name.) This will get you into the docker in the root
 directory. From there, cd into the `/MathJax-dev/fonts/OTF/TeX` directory, and
 run
 
-    make ttf eot woff
+    make ttf eot woff woff2
 
 to build all of the fonts that we need. Finally, leave the docker and copy all
-the files off with
+the files off with the `copy_fonts.sh` script:
 
-    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/ttf ./
-    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/eot ./
-    docker cp mjf:/MathJax-dev/fonts/OTF/TeX/woff ./
+    ./copy_fonts.sh mjf
 
-(note we're using `mjf:` to specify the name of the docker we created above)
-Compile the fonts into a single directory
-
-    mv {ttf,eot,woff}/* ./
-
-Remove the WinIE6 and WinChrome fonts
-
-    rm KaTeX_Win*
-
-And you're good to go! Don't forget to update the font metrics with the
-metric_parse.rb script once you're done.
+And you're good to go! Don't forget to update the font metrics with `make
+metrics`.
 
 ### General Docker Help
 -----------------------

dockers/MathJaxFonts/copy_fonts.sh

@@ -0,0 +1,47 @@
+#!/usr/bin/env bash
+
+set -e
+
+if [ -z "$1" ]; then
+    echo "Usage: $(basename $0) <docker name>"
+    echo "  If you followed the README, the docker name would be 'mjf'"
+    exit 1
+else
+    DOCKER_NAME="$1"
+fi
+
+mkdir fonts
+
+used_fonts=(
+    KaTeX_AMS-Regular
+    KaTeX_Caligraphic-Bold
+    KaTeX_Caligraphic-Regular
+    KaTeX_Fraktur-Bold
+    KaTeX_Fraktur-Regular
+    KaTeX_Main-Bold
+    KaTeX_Main-Italic
+    KaTeX_Main-Regular
+    KaTeX_Math-BoldItalic
+    KaTeX_Math-Italic
+    KaTeX_Math-Regular
+    KaTeX_SansSerif-Bold
+    KaTeX_SansSerif-Italic
+    KaTeX_SansSerif-Regular
+    KaTeX_Script-Regular
+    KaTeX_Size1-Regular
+    KaTeX_Size2-Regular
+    KaTeX_Size3-Regular
+    KaTeX_Size4-Regular
+    KaTeX_Typewriter-Regular
+)
+
+for filetype in ttf eot woff woff2; do
+    echo "Copying $filetype"
+    docker cp "$DOCKER_NAME":/MathJax-dev/fonts/OTF/TeX/"$filetype" fonts
+
+    for font in ${used_fonts[*]}; do
+        mv fonts/"$filetype"/"$font"* fonts/
+    done
+
+    rm -rf fonts/"$filetype"
+done