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This'll patch vis.lexers.load to return nil when the lexer could not be
found. Previously it would've errored out, which the load in lexer.lua
still will as this is used in lexers themselves.
Another possibility is to only patch set_syntax in vis.lua and the
WIN_HIGHLIGHT handler in vis-std.lua, but as most references to
vis.lexers.load already handle a nil return, this seems better.
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The color settings are currently stored in the `vis.lexers` table,
make sure it is not nil even when loading the lexer module (or one
of its dependencies e.g. lpeg) failed.
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I think the default value for the cache argument to the lexer load
function should be true, not false. Optimize for the common case.
This makes the API ugly/harder to use. But for now we follow upstream.
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The following structure is adapted:
* visrc.lua entry point for all Lua code
* vis.lua only implements the Lua part of the core API
* vis-std.lua registers standard event handlers (e.g. syntax highlighting,
statusbar handling, theme changes etc). It is sourced from vis.lua.
* plugins/* non essential editor functionality, needs to be explicitly
enabled by loading it from visrc.lua
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