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The init event is emitted immediately after `visrc.lua` has been sourced, but
before any other events have occured, in particular the command line arguments
have not yet been processed.
Close #422
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The editor core calls into the functions registered in the `vis.events`
table which then multiplex the events to all registered event handlers.
The first handler which returns a non `nil` value terminates event
propagation.
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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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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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