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Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:
$ strace -e open -o log ./vis +q config.h && wc -l log
In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.
$ ./configure --disable-lua
$ rm -rf lua
Should result in a source tree with most lua specifc functionality
removed.
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`vis.filetypes` can be found on [line 72 of `vis.lua`](https://github.com/martanne/vis/blob/master/vis.lua#L72), but is not present at all in lexer.lua.
Fix `lexers/README.md` to avoid further confusion.
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This simplifies deployment of vis on remote systems without root
access. The idea is to extract a statically linked binary together with
the lexer syntax files into some directory, adjust $PATH to include it
and have everything just work.
For now this uses /proc/self/exe and thus only works on Linux based
systems.
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The ordered list of paths for startup and lexer files is:
- $VIS_PATH/{,lexers}
- $XDG_CONFIG_HOME/vis/{,lexers} (defaulting to $HOME/.config/vis/{,lexers})
- /usr/local/share/vis/{,lexers}
- /usr/share/vis/{,lexers}
- package.path (standard lua search path)
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