Render not_found with an absolute path to the rust stylesheet

[richo]

This fixes the stylesheets being relative. The fix is a little bit sketchy but I don't see a cleaner way to do this offhand.

Updates #14126

[alexcrichton]

Just confirming, but you've built this successfully? I've had getopts complain in the past about duplicate options on the command line (this is passing --markdown-css twice).

[richo]

Yup, I just built it then (albeit with a few days old rustc):

Build output:

xenia ± make doc/not_found.html NO_REBUILD=1                           ~/code/ext/rust docs/absolute_stylesheets (?2)
cfg: build triple x86_64-apple-darwin
cfg: host triples x86_64-apple-darwin
cfg: target triples x86_64-apple-darwin
cfg: enabling more debugging (CFG_ENABLE_DEBUG)
cfg: host for x86_64-apple-darwin is x86_64
cfg: os for x86_64-apple-darwin is apple-darwin
cfg: using clang
cfg: no pdflatex found, deferring to xelatex
cfg: no xelatex found, deferring to lualatex
cfg: no lualatex found, disabling LaTeX docs
cfg: no pandoc found, omitting PDF and EPUB docs
cfg: no llnextgen found, omitting grammar-verification
DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH:/Users/richo/code/ext/rust/x86_64-apple-darwin/stage2/lib" x86_64-apple-darwin/stage2/bin/rustdoc --markdown-css rust.css --markdown-before-content=doc/version_info.html --markdown-in-header=doc/favicon.inc --markdown-after-content=doc/footer.inc --markdown-css http://static.rust-lang.org/doc/master/rust.css /Users/richo/code/ext/rust/src/doc/not_found.md
xenia ±

I quickly checked that it works, but while double checking this, I noticed that it actually adds a second link tag, instead of replacing the old one. This will work, but it is a little janky and it does have one obvious place where it'll do something odd (404 in a directory with a rust.css in it)

[richo]

Updated build here: http://richo.psych0tik.net/rust-docs/not_found.html

Note that I didn't hose the old content, so this will be loading both stylesheets, and doesn't look obviously broken, but who knows what might happen in future.

[alexcrichton]

Can we tweak how the css is added so only one stylesheet is present? You may have to factor out the css variable into a separate variable in the makefiles, or have RUSTDOC_HTML_OPTS_NO_CSS or something like that

[richo]

Good idea. Implemented.