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Differentiate between the case where the module is not found and
the case where an error occured while loading it.
This should make it easier to debug cases in which there is a
Lua version mismatch between vis and lpeg.
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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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