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require "vis"
ec = require "editorconfig"
-- Simple wrapper
function vis_set(option, value)
if type(value) == "boolean" then
if value then
value = "yes"
else
value = "no"
end
end
vis:command("set " .. option .. " " .. value)
end
function set_pre_save(f, value)
if value == "true" then
vis.events.subscribe(vis.events.FILE_SAVE_PRE, f)
else
vis.events.unsubscribe(vis.events.FILE_SAVE_PRE, f)
end
end
function set_file_open(f, value)
if value == "true" then
vis.events.subscribe(vis.events.FILE_OPEN, f)
else
vis.events.unsubscribe(vis.events.FILE_OPEN, f)
end
end
-- Custom functionality
function insert_final_newline(file, path)
-- Technically speaking, this is a pre-save-hook as well and could
-- therefore respect edconf_hooks_enabled. Since this function runs
-- blazingly fast and scales with a complexity of O(1), however,
-- there is no need to disable it.
if file.size > 0 and file:content(file.size-1, 1) ~= '\n' then
file:insert(file.size, '\n')
end
end
function strip_final_newline(file, path)
-- In theory, this would have a complexity of O(n) as well and could
-- thus be made optional via edconf_hooks_enabled. On the other hand,
-- this is probably a very rare edge case, so stripping all trailing
-- newline characters is probably safe enough.
while file:content(file.size-1, 1) == '\n' do
file:delete(file.size-1, 1)
end
end
function trim_trailing_whitespace(file, path)
if not edconf_hooks_enabled then return end
for i=1, #file.lines do
if string.match(file.lines[i], '[ \t]$') then
file.lines[i] = string.gsub(file.lines[i], '[ \t]*$', '')
end
end
end
function enforce_crlf_eol(file, path)
if not edconf_hooks_enabled then return end
for i=1, #file.lines do
if not string.match(file.lines[i], '\r$') then
file.lines[i] = string.gsub(file.lines[i], '$', '\r')
end
end
end
function enforce_lf_eol(file, path)
if not edconf_hooks_enabled then return end
for i=1, #file.lines do
if string.match(file.lines[i], '\r$') then
file.lines[i] = string.gsub(file.lines[i], '\r$', '')
end
end
end
global_max_line_length = 80 -- This is ugly, but we do want to use
-- single function that we can register
-- or unregister as needed
function max_line_length(file, path)
if not edconf_hooks_enabled then return end
local overlong_lines = {}
for i=1, #file.lines do
if string.len(file.lines[i]) > global_max_line_length then
table.insert(overlong_lines, i)
end
end
if #overlong_lines > 0 then
local lines_are = (function(x)
if x>1 then return "lines are" else return "line is" end
end)(#overlong_lines)
vis:info(string.format(
"%d %s longer than %d characters: %s",
#overlong_lines, lines_are, global_max_line_length,
table.concat(overlong_lines, ",")
))
end
end
OPTIONS = {
indent_style = function (value)
vis_set("expandtab", (value == "space"))
end,
indent_size = function (value)
if value ~= "tab" then -- tab_width is a synonym anyway
vis_set("tabwidth", value)
end
end,
tab_width = function (value)
vis_set("tabwidth", value)
end,
spell_language = function (value, file)
file.spell_language = value
end,
insert_final_newline = function (value)
-- According to the editorconfig specification, insert_final_newline
-- false is supposed to mean stripping the final newline, if present.
-- See https://editorconfig-specification.readthedocs.io/#supported-pairs
--
-- Quote: insert_final_newline Set to true ensure file ends with a
-- newline when saving and false to ensure it doesn’t.
--
set_pre_save(insert_final_newline, tostring(value == "true"))
set_pre_save(strip_final_newline, tostring(value == "false"))
end,
trim_trailing_whitespace = function (value)
set_pre_save(trim_trailing_whitespace, value)
end,
-- End of line is only partially implemented. While vis does not
-- support customized newlines, it does work well enough with crlf
-- newlines. Therefore, setting end_of_line=crlf will just ensure
-- that there is a cr at the end of each line. Setting end_of_line=lf
-- will strip any cr characters at the end of lines. This hopefully
-- eases the pain of working with crlf files a little.
end_of_line = function (value)
set_pre_save(enforce_crlf_eol, tostring(value == "crlf"))
set_pre_save(enforce_lf_eol, tostring(value == "lf"))
end,
-- There is probably no straightforward way to enforce a maximum line
-- length across different programming languages. If a maximum line
-- length is set, we can at least issue a warning, however.
max_line_length = function(value)
if value ~= "off" then
global_max_line_length = tonumber(value)
end
set_pre_save(max_line_length, tostring(value ~= "off"))
end,
-- Not supported by vis
-- charset
-- Partial support
-- end_of_line
-- max_line_length
}
-- Compatible with editorconfig-core-lua v0.3.0
function ec_iter(p)
i = 0
props, keys = ec.parse(p)
n = #keys
return function ()
i = i + 1
if i <= n then
return keys[i], props[keys[i]]
end
end
end
function ec_set_values(file)
if file.path then
for name, value in ec_iter(file.path) do
if OPTIONS[name] then
OPTIONS[name](value, file)
end
end
end
end
function ec_parse_cmd() ec_set_values(vis.win.file) end
vis:command_register("econfig_parse", ec_parse_cmd, "(Re)parse an editorconfig file")
vis.events.subscribe(vis.events.FILE_OPEN, function (file)
ec_set_values(file)
end)
vis.events.subscribe(vis.events.FILE_SAVE_POST, function (file, path)
ec_set_values(file)
end)
edconf_hooks_enabled = false
vis:option_register("edconfhooks", "bool", function(value)
edconf_hooks_enabled = value
end, "Enable optional pre-save-hooks for certain editorconfig settings")
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