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# Building Highlight.js for Gerrit
Highlight JS needs to be built with specific language support. Here are the
steps to build the minified file that appears here.
NOTE: If you are adding support for a language to Highlight.js make sure to add
it to the list of languages in the build command below.
## Prerequisites
You will need:
* nodejs
* closure-compiler
* git
## Steps to Create the Pack File
The packed version of Highlight.js is an un-minified JS file with all of the
languages included. Build it with the following:
$> # start in some temp directory
$> git clone https://github.com/highlightjs/highlight.js
$> cd highlight.js
$> npm install
$> node tools/build.js -n
The resulting JS file will appear in the "build" directory of the Highlight.js
repo under the name "highlight.pack.js".
## Minification
Minify the file using closure-compiler using the command below.
$> wget https://dl.google.com/closure-compiler/compiler-latest.zip
$> unzip compiler-latest.zip
$> mv closure-compiler-*.jar closure-compiler.jar
$> java -jar ./closure-compiler.jar \
--js build/highlight.pack.js \
--js_output_file build/highlight.min.js
Copy the header comment that appears on the first line of
build/highlight.pack.js and add it to the start of build/highlight.min.js.
## Finish
Copy the resulting build/highlight.min.js file to lib/highlightjs
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