diff options
Diffstat (limited to 'lua/vis.lua')
| -rw-r--r-- | lua/vis.lua | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/lua/vis.lua b/lua/vis.lua index f1aff45..24d00bd 100644 --- a/lua/vis.lua +++ b/lua/vis.lua @@ -5,8 +5,6 @@ --- -- @type Vis -vis.lexers = {} - --- Map a new motion. -- -- Sets up a mapping in normal, visual and operator pending mode. @@ -64,6 +62,30 @@ vis.textobject_new = function(vis, key, textobject, help) return true end +--- Check whether a Lua module exists +-- +-- Checks whether a subsequent @{require} call will succeed. +-- @tparam string name the module name to check +-- @treturn bool whether the module was found +vis.module_exist = function(vis, name) + for _, searcher in ipairs(package.searchers or package.loaders) do + local loader = searcher(name) + if type(loader) == 'function' then + return true + end + end + return false +end + +if not vis:module_exist('lpeg') then + vis:info('WARNING: could not find lpeg module') +elseif not vis:module_exist('lexer') then + vis:info('WARNING: could not find lexer module') +else + vis.lexers = require('lexer') + vis.lpeg = require('lpeg') +end + --- Events. -- -- User scripts can subscribe Lua functions to certain events. Multiple functions |