Fixed 'cant read property pipe of undefined', added option --namemap

[M4R7iNP]

I got the exception "TypeError: Cannot read property 'pipe' of undefined" which I fixed in this commit.

--namemap is a json file that maps unicode to icon name Useful when reconstructing a svg font without names embedded

Example name map: { "\uF167": "youtube", "\uF16A": "youtube-play", "\uF166": "youtube-square" }

Example usage: node svgfont2svgicons.js --namemap ./fontawesome.json ./fontawesome-webfont.svg ./icons/

[nfroidure]

Thanks for the PR but it comes with no tests :(.

Also, i would have prefer using commander (like i did in the svgicons2svgfont project) instead of manually parsing CLI args. It is way far clearer. https://github.com/nfroidure/svgicons2svgfont/blob/master/bin/svgicons2svgfont.js#L9 https://github.com/nfroidure/svgicons2svgfont/blob/master/tests/cli.mocha.js

Th name mapping system should be in its own file, tested and could be override through an option like it was done for the metadataProvider of svgicons2svgfont: https://github.com/nfroidure/svgicons2svgfont/blob/master/src/metadata.js https://github.com/nfroidure/svgicons2svgfont/blob/master/tests/metadata.mocha.js

The feature is meaningful but i won't merge as is.

[nfroidure]

Also worth noting the name mapping should be done at the API level instead than in the CLI file to be usable either through the API and CLI tool.

[M4R7iNP]

I moved it to api level which, as you said, makes much more sense.

Thanks for the commander tip - I have always found it faster to write a simple argv parser than to compare and find a fitting argument parser.

I have also written a test for it. I planned write it if you found the feature meaningful.

[nfroidure]

Nice work, thanks for the contrib.