Minification breaks/distorts a SVG path

[anthonyfok]

@Arty2 reported at gohugoio/hugo#6475:

An inline SVG is modified (and broken) by the minifier.
See the following after .005-.372:

Original:

<svg xmlns="http://www.w3.org/2000/svg" height="0.8rem" viewBox="0 0 3.375 2.912"><path stroke-width="0" d="M.166.1L.1.63s.417.054 1.355.063c.01.22.018.471.018.797 0 .056-.002.08-.003.132h-.397l.002-.133c0-.144-.003-.252-.005-.372a16.062 16.062 0 01-.53-.023c.003.128.006.246.006.396 0 .738-.03 1.123-.05 1.322.139-.01.32-.017.539-.023.011-.138.022-.358.03-.637h.395c-.01.286-.024.508-.035.63l.263-.002c.106 0 .178.003.273.004.019-.23.04-.592.04-1.294 0-.335-.007-.582-.015-.798.135-.002.282-.003.394-.006.01.221.018.475.018.804 0 .72-.028 1.096-.047 1.3.217.005.397.013.534.022.02-.23.043-.598.043-1.322 0-.35-.008-.606-.017-.828.245-.016.364-.032.364-.032L3.209.1s-.53.066-1.521.066C.696.167.166.1.166.1z"/></svg>

Minified:

<svg xmlns="http://www.w3.org/2000/svg" height=".8rem" viewBox="0 0 3.375 2.912"><path stroke-width="0" d="M.166.1.1.63s.417.054 1.355.063c.01.22.018.471.018.797.0.056-.002.08-.003.132h-.397l.002-.133c0-.144-.003-.252-.005-.372.003.128.006.246.006.396.0.738-.03 1.123-.05 1.322.139-.01.32-.017.539-.023.011-.138.022-.358.03-.637h.395c-.01.286-.024.508-.035.63l.263-.002c.106.0.178.003.273.004.019-.23.04-.592.04-1.294.0-.335-.007-.582-.015-.798.135-.002.282-.003.394-.006.01.221.018.475.018.804.0.72-.028 1.096-.047 1.3.217.005.397.013.534.022.02-.23.043-.598.043-1.322.0-.35-.008-.606-.017-.828.245-.016.364-.032.364-.032L3.209.1s-.53.066-1.521.066C.696.167.166.1.166.1z"></path></svg>

---

I was able to reproduce what @Arty2 is seeing with the minify CLI tool, v2.5.2 and v2.3.8, and for my curiosity sake, here is a screenshot of the above SVGs:

Original	Minified

Many thanks!

[tdewolff]

Looks like the a command is entirely removed. I think the problem is that the coordinates for the a command are 16.062 16.062 0 01-.53-.023, where the largeArc and sweep booleans are joined as 01 which is interpreted as a number 1. I wasn't aware it is valid SVG syntax to join both booleans like that. Looks like it is allowed indeed: https://www.w3.org/TR/SVG/paths.html#PathDataBNF

I will work on incorporating this, thanks for bringing it up!

[tdewolff]

Fixed with 0ad8cf4, 5522f26, 8555c8c

I will release a new version of minify soon, need to do some more testing.

[MeiK2333]

@tdewolff Do you have any plans to release the version recently?

[tdewolff]

Yes, but it needs to wait on some other changes I want to push through that need more testing (I fixed an urgent bug yesterday of the changes above in 75ac1f1). Hopefully in a weeks time I can release a new version.