lite-xl/data/core/dirwatch.lua

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local common = require "core.common"
local config = require "core.config"
local dirwatch = {}
function dirwatch:__index(idx)
local value = rawget(self, idx)
if value ~= nil then return value end
return dirwatch[idx]
end
function dirwatch.new()
local t = {
scanned = {},
watched = {},
reverse_watched = {},
monitor = dirmonitor.new(),
windows_watch_top = nil,
windows_watch_count = 0
}
setmetatable(t, dirwatch)
return t
end
function dirwatch:scan(directory, bool)
if bool == false then return self:unwatch(directory) end
self.scanned[directory] = system.get_file_info(directory).modified
end
-- Should be called on every directory in a subdirectory.
-- In windows, this is a no-op for anything underneath a top-level directory,
-- but code should be called anyway, so we can ensure that we have a proper
-- experience across all platforms. Should be an absolute path.
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-- Can also be called on individual files, though this should be used sparingly,
-- so as not to run into system limits (like in the autoreload plugin).
function dirwatch:watch(directory, bool)
if bool == false then return self:unwatch(directory) end
local info = system.get_file_info(directory)
if not info then return end
if not self.watched[directory] and not self.scanned[directory] then
if PLATFORM == "Windows" then
if info.type ~= "dir" then return self:scan(directory) end
if not self.windows_watch_top or directory:find(self.windows_watch_top, 1, true) ~= 1 then
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-- Get the highest level of directory that is common to this directory, and the original.
local target = directory
while self.windows_watch_top and self.windows_watch_top:find(target, 1, true) ~= 1 do
target = common.dirname(target)
end
if target ~= self.windows_watch_top then
local value = self.monitor:watch(target)
if value and value < 0 then
return self:scan(directory)
end
self.windows_watch_top = target
end
end
self.windows_watch_count = self.windows_watch_count + 1
self.watched[directory] = true
else
local value = self.monitor:watch(directory)
-- If for whatever reason, we can't watch this directory, revert back to scanning.
-- Don't bother trying to find out why, for now.
if value and value < 0 then
return self:scan(directory)
end
self.watched[directory] = value
self.reverse_watched[value] = directory
end
end
end
-- this should be an absolute path
function dirwatch:unwatch(directory)
if self.watched[directory] then
if PLATFORM ~= "Windows" then
self.monitor:unwatch(self.watched[directory])
self.reverse_watched[directory] = nil
else
self.windows_watch_count = self.windows_watch_count - 1
if self.windows_watch_count == 0 then
self.windows_watch_top = nil
self.monitor:unwatch(directory)
end
end
self.watched[directory] = nil
elseif self.scanned[directory] then
self.scanned[directory] = nil
end
end
-- designed to be run inside a coroutine.
function dirwatch:check(change_callback, scan_time, wait_time)
local had_change = false
self.monitor:check(function(id)
had_change = true
if PLATFORM == "Windows" then
change_callback(common.dirname(self.windows_watch_top .. PATHSEP .. id))
elseif self.reverse_watched[id] then
change_callback(self.reverse_watched[id])
end
end)
local start_time = system.get_time()
for directory, old_modified in pairs(self.scanned) do
if old_modified then
local new_modified = system.get_file_info(directory).modified
if old_modified < new_modified then
change_callback(directory)
had_change = true
self.scanned[directory] = new_modified
end
end
if system.get_time() - start_time > scan_time then
coroutine.yield(wait_time)
start_time = system.get_time()
end
end
return had_change
end
-- inspect config.ignore_files patterns and prepare ready to use entries.
local function compile_ignore_files()
local ipatterns = config.ignore_files
local compiled = {}
-- config.ignore_files could be a simple string...
if type(ipatterns) ~= "table" then ipatterns = {ipatterns} end
for i, pattern in ipairs(ipatterns) do
-- we ignore malformed pattern that raise an error
if pcall(string.match, "a", pattern) then
table.insert(compiled, {
use_path = pattern:match("/[^/$]"), -- contains a slash but not at the end
-- An '/' or '/$' at the end means we want to match a directory.
match_dir = pattern:match(".+/%$?$"), -- to be used as a boolen value
pattern = pattern -- get the actual pattern
})
end
end
return compiled
end
local function fileinfo_pass_filter(info, ignore_compiled)
if info.size >= config.file_size_limit * 1e6 then return false end
local basename = common.basename(info.filename)
-- replace '\' with '/' for Windows where PATHSEP = '\'
local fullname = "/" .. info.filename:gsub("\\", "/")
for _, compiled in ipairs(ignore_compiled) do
local test = compiled.use_path and fullname or basename
if compiled.match_dir then
if info.type == "dir" and string.match(test .. "/", compiled.pattern) then
return false
end
else
if string.match(test, compiled.pattern) then
return false
end
end
end
return true
end
local function compare_file(a, b)
return a.filename < b.filename
end
-- compute a file's info entry completed with "filename" to be used
-- in project scan or falsy if it shouldn't appear in the list.
local function get_project_file_info(root, file, ignore_compiled)
local info = system.get_file_info(root .. PATHSEP .. file)
-- info can be not nil but info.type may be nil if is neither a file neither
-- a directory, for example for /dev/* entries on linux.
if info and info.type then
info.filename = file
return fileinfo_pass_filter(info, ignore_compiled) and info
end
end
-- "root" will by an absolute path without trailing '/'
-- "path" will be a path starting without '/' and without trailing '/'
-- or the empty string.
-- It will identifies a sub-path within "root.
-- The current path location will therefore always be: root .. path.
-- When recursing "root" will always be the same, only "path" will change.
-- Returns a list of file "items". In each item the "filename" will be the
-- complete file path relative to "root" *without* the trailing '/', and without the starting '/'.
function dirwatch.get_directory_files(dir, root, path, t, entries_count, recurse_pred)
local t0 = system.get_time()
local t_elapsed = system.get_time() - t0
local dirs, files = {}, {}
local ignore_compiled = compile_ignore_files()
local all = system.list_dir(root .. PATHSEP .. path)
if not all then return nil end
for _, file in ipairs(all or {}) do
local info = get_project_file_info(root, (path ~= "" and (path .. PATHSEP) or "") .. file, ignore_compiled)
if info then
table.insert(info.type == "dir" and dirs or files, info)
entries_count = entries_count + 1
end
end
local recurse_complete = true
table.sort(dirs, compare_file)
for _, f in ipairs(dirs) do
table.insert(t, f)
if recurse_pred(dir, f.filename, entries_count, t_elapsed) then
local _, complete, n = dirwatch.get_directory_files(dir, root, f.filename, t, entries_count, recurse_pred)
recurse_complete = recurse_complete and complete
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if n ~= nil then
entries_count = n
end
else
recurse_complete = false
end
end
table.sort(files, compare_file)
for _, f in ipairs(files) do
table.insert(t, f)
end
return t, recurse_complete, entries_count
end
return dirwatch