Add B2G build and new preprocessor.

[brendandahl]

Since we're adding another target that I believe will require more customization in the future and I think our strategy of just using SED was getting too messy, I've added a new preprocessor which tries to follow the ff preprocessor(https://developer.mozilla.org/en/Build/Text_Preprocessor). I also added another little build helper function to help with common steps we were taking in the main build targets(firefox,chrome,mozcentral,b2g,web). We could probably simplify things even further if we added an initial layout step to this, but the PR was already getting too big so I'll wait to do that.

Also, I added a new build target generic which builds the generic production version of pdf.js. This is basically the contents of our old web build target. I mainly did this because now the file build/pdf.js is not preprocessed since it needs to be preprocessed differently by each main build target.

For testing, I built all the targets and compared them to the current build output. Everything still needs verification though.

[brendandahl]

/botio-windows preview
/botio-linux lint

[pdfjsbot]

From: Bot.io (Linux)

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Received

Command cmd_lint from @brendandahl received. Current queue size: 0

Live output at: http://107.21.233.14:8877/c531b9fe175854a/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Received

Command cmd_preview from @brendandahl received. Current queue size: 0

Live output at: http://107.22.172.223:8877/42440e5b0162f67/output.txt

[pdfjsbot]

From: Bot.io (Windows)

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Success

Full output at http://107.22.172.223:8877/42440e5b0162f67/output.txt

Total script time: 0.83 mins

Published

• Viewer: http://107.22.172.223:8877/42440e5b0162f67/web/viewer.html
• Extension: http://107.22.172.223:8877/42440e5b0162f67/extensions/firefox/pdf.js.xpi
• Extension (AMO): http://107.22.172.223:8877/42440e5b0162f67/extensions/firefox/pdf.js.amo.xpi

[pdfjsbot]

From: Bot.io (Linux)

---

Success

Full output at http://107.21.233.14:8877/c531b9fe175854a/output.txt

Total script time: 1.28 mins

• Lint: Passed

[arturadib]

As per IRC, @brendandahl will factor out BuildHelper and require() it

[yurydelendik]

Can we comment it or include as a snippet?

[yurydelendik]

Build/pdf.js and build/chrome/content/build/pdf.js still have pre-processor directives.

Not really sure how to check B2G output. node make b2g outputs:

### Building B2G (Firefox OS App)

### Bundling files into build/pdf.js

timers.js:103
            if (!process.listeners('uncaughtException').length) throw e;
                                                                      ^
Error: ENOENT, no such file or directory 'c:\Work\pdf.js\web\viewer-snippet-b2g.
html'
    at Object.fs.openSync (fs.js:338:18)
    at Object.fs.readFileSync (fs.js:182:15)
    at preprocess (c:\Work\pdf.js\external\builder\builder.js:20:18)
    at include (c:\Work\pdf.js\external\builder\builder.js:36:5)
    at preprocess (c:\Work\pdf.js\external\builder\builder.js:79:13)
    at c:\Work\pdf.js\external\builder\builder.js:124:7
    at Array.forEach (native)
    at c:\Work\pdf.js\external\builder\builder.js:119:13
    at Array.forEach (native)
    at Object.build (c:\Work\pdf.js\external\builder\builder.js:114:20)

+1 from me if notes above will be addressed

[brendandahl]

Missed adding the snippet file. For playing with b2g I've been using the desktop builds from:
http://ftp.mozilla.org/pub/mozilla.org/b2g/nightly/latest-mozilla-central/

And running the following script:

#!/bin/sh
pushd .;
cd ~/projects/mine/pdf.js
node make b2g
#cp ~/projects/mine/pdf.js/web/compressed.tracemonkey-pldi-09.pdf ~/projects/mine/pdf.js/build/b2g/content/web/;
cp -R ~/projects/mine/pdf.js/build/b2g/content ~/projects/mine/gaia/apps/pdfjs/;
cd ~/projects/mine/gaia
rm -rf profile
make
/Applications/B2G.app/Contents/MacOS/b2g -jsconsole -profile ~/projects/mine/gaia/profile/
popd;

[yurydelendik]

For empty repo, node make b2g generates:

### Building B2G (Firefox OS App)

### Bundling files into build/pdf.js
cp: no such file or directory: web/locale.properties

Other than that works; tested with gaia commit 5e3499c4ad1d