lite-xl/data/core/common.lua

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local common = {}
function common.is_utf8_cont(s, offset)
local byte = s:byte(offset or 1)
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return byte >= 0x80 and byte < 0xc0
end
function common.utf8_chars(text)
return text:gmatch("[\0-\x7f\xc2-\xf4][\x80-\xbf]*")
end
function common.clamp(n, lo, hi)
return math.max(math.min(n, hi), lo)
end
function common.round(n)
return n >= 0 and math.floor(n + 0.5) or math.ceil(n - 0.5)
end
function common.find_index(tbl, prop)
for i, o in ipairs(tbl) do
if o[prop] then return i end
end
end
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function common.lerp(a, b, t)
if type(a) ~= "table" then
return a + (b - a) * t
end
local res = {}
for k, v in pairs(b) do
res[k] = common.lerp(a[k], v, t)
end
return res
end
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function common.distance(x1, y1, x2, y2)
return math.sqrt(math.pow(x2-x1, 2)+math.pow(y2-y1, 2))
end
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function common.color(str)
local r, g, b, a = str:match("#(%x%x)(%x%x)(%x%x)")
if r then
r = tonumber(r, 16)
g = tonumber(g, 16)
b = tonumber(b, 16)
a = 1
elseif str:match("rgba?%s*%([%d%s%.,]+%)") then
local f = str:gmatch("[%d.]+")
r = (f() or 0)
g = (f() or 0)
b = (f() or 0)
a = f() or 1
else
error(string.format("bad color string '%s'", str))
end
return r, g, b, a * 0xff
end
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function common.splice(t, at, remove, insert)
insert = insert or {}
local offset = #insert - remove
local old_len = #t
if offset < 0 then
for i = at - offset, old_len - offset do
t[i + offset] = t[i]
end
elseif offset > 0 then
for i = old_len, at, -1 do
t[i + offset] = t[i]
end
end
for i, item in ipairs(insert) do
t[at + i - 1] = item
end
end
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local function compare_score(a, b)
return a.score > b.score
end
local function fuzzy_match_items(items, needle, files)
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local res = {}
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for _, item in ipairs(items) do
local score = system.fuzzy_match(tostring(item), needle, files)
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if score then
table.insert(res, { text = item, score = score })
end
end
table.sort(res, compare_score)
for i, item in ipairs(res) do
res[i] = item.text
end
return res
end
function common.fuzzy_match(haystack, needle, files)
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if type(haystack) == "table" then
return fuzzy_match_items(haystack, needle, files)
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end
return system.fuzzy_match(haystack, needle, files)
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end
function common.fuzzy_match_with_recents(haystack, recents, needle)
if needle == "" then
local recents_ext = {}
for i = 2, #recents do
table.insert(recents_ext, recents[i])
end
table.insert(recents_ext, recents[1])
local others = common.fuzzy_match(haystack, "", true)
for i = 1, #others do
table.insert(recents_ext, others[i])
end
return recents_ext
else
return fuzzy_match_items(haystack, needle, true)
end
end
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function common.path_suggest(text)
local path, name = text:match("^(.-)([^/\\]*)$")
local files = system.list_dir(path == "" and "." or path) or {}
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local res = {}
for _, file in ipairs(files) do
file = path .. file
local info = system.get_file_info(file)
if info then
if info.type == "dir" then
file = file .. PATHSEP
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end
if file:lower():find(text:lower(), nil, true) == 1 then
table.insert(res, file)
end
end
end
return res
end
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function common.dir_path_suggest(text)
local path, name = text:match("^(.-)([^/\\]*)$")
local files = system.list_dir(path == "" and "." or path) or {}
local res = {}
for _, file in ipairs(files) do
file = path .. file
local info = system.get_file_info(file)
if info and info.type == "dir" and file:lower():find(text:lower(), nil, true) == 1 then
table.insert(res, file)
end
end
return res
end
function common.dir_list_suggest(text, dir_list)
local path, name = text:match("^(.-)([^/\\]*)$")
local res = {}
for _, dir_path in ipairs(dir_list) do
if dir_path:lower():find(text:lower(), nil, true) == 1 then
table.insert(res, dir_path)
end
end
return res
end
function common.match_pattern(text, pattern, ...)
if type(pattern) == "string" then
return text:find(pattern, ...)
end
for _, p in ipairs(pattern) do
local s, e = common.match_pattern(text, p, ...)
if s then return s, e end
end
return false
end
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function common.draw_text(font, color, text, align, x,y,w,h)
local tw, th = font:get_width(text), font:get_height(text)
if align == "center" then
x = x + (w - tw) / 2
elseif align == "right" then
x = x + (w - tw)
end
y = common.round(y + (h - th) / 2)
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return renderer.draw_text(font, text, x, y, color), y + th
end
function common.bench(name, fn, ...)
local start = system.get_time()
local res = fn(...)
local t = system.get_time() - start
local ms = t * 1000
local per = (t / (1 / 60)) * 100
print(string.format("*** %-16s : %8.3fms %6.2f%%", name, ms, per))
return res
end
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function common.serialize(val)
if type(val) == "string" then
return string.format("%q", val)
elseif type(val) == "table" then
local t = {}
for k, v in pairs(val) do
table.insert(t, "[" .. common.serialize(k) .. "]=" .. common.serialize(v))
end
return "{" .. table.concat(t, ",") .. "}"
end
return tostring(val)
end
function common.basename(path)
-- a path should never end by / or \ except if it is '/' (unix root) or
-- 'X:\' (windows drive)
return path:match("[^\\/]+$") or path
end
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-- can return nil if there is no directory part in the path
function common.dirname(path)
return path:match("(.+)[\\/][^\\/]+$")
end
function common.home_encode(text)
if HOME and string.find(text, HOME, 1, true) == 1 then
local dir_pos = #HOME + 1
-- ensure we don't replace if the text is just "$HOME" or "$HOME/" so
-- it must have a "/" following the $HOME and some characters following.
if string.find(text, PATHSEP, dir_pos, true) == dir_pos and #text > dir_pos then
return "~" .. text:sub(dir_pos)
end
end
return text
end
function common.home_encode_list(paths)
local t = {}
for i = 1, #paths do
t[i] = common.home_encode(paths[i])
end
return t
end
function common.home_expand(text)
return HOME and text:gsub("^~", HOME) or text
end
local function split_on_slash(s, sep_pattern)
local t = {}
if s:match("^[/\\]") then
t[#t + 1] = ""
end
for fragment in string.gmatch(s, "([^/\\]+)") do
t[#t + 1] = fragment
end
return t
end
-- The filename argument given to the function is supposed to
-- come from system.absolute_path and as such should be an
-- absolute path without . or .. elements.
-- This function exists because on Windows the drive letter returned
-- by system.absolute_path is sometimes with a lower case and sometimes
-- with an upper case to we normalize to upper case.
function common.normalize_volume(filename)
if not filename then return end
if PATHSEP == '\\' then
local drive, rem = filename:match('^([a-zA-Z]:\\)(.*)')
if drive then
return drive:upper() .. rem
end
end
return filename
end
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function common.normalize_path(filename)
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if not filename then return end
local volume
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if PATHSEP == '\\' then
filename = filename:gsub('[/\\]', '\\')
local drive, rem = filename:match('^([a-zA-Z]:\\)(.*)')
if drive then
volume, filename = drive:upper(), rem
else
drive, rem = filename:match('^(\\\\[^\\]+\\[^\\]+\\)(.*)')
if drive then
volume, filename = drive, rem
end
end
else
local relpath = filename:match('^/(.+)')
if relpath then
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volume, filename = "/", relpath
end
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end
local parts = split_on_slash(filename, PATHSEP)
local accu = {}
for _, part in ipairs(parts) do
if part == '..' then
if #accu > 0 and accu[#accu] ~= ".." then
table.remove(accu)
elseif volume then
error("invalid path " .. volume .. filename)
else
table.insert(accu, part)
end
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elseif part ~= '.' then
table.insert(accu, part)
end
end
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local npath = table.concat(accu, PATHSEP)
return (volume or "") .. (npath == "" and PATHSEP or npath)
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end
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function common.path_belongs_to(filename, path)
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return string.find(filename, path .. PATHSEP, 1, true) == 1
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end
function common.relative_path(ref_dir, dir)
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local drive_pattern = "^(%a):\\"
local drive, ref_drive = dir:match(drive_pattern), ref_dir:match(drive_pattern)
if drive and ref_drive and drive ~= ref_drive then
-- Windows, different drives, system.absolute_path fails for C:\..\D:\
return dir
end
local ref_ls = split_on_slash(ref_dir)
local dir_ls = split_on_slash(dir)
local i = 1
while i <= #ref_ls do
if dir_ls[i] ~= ref_ls[i] then
break
end
i = i + 1
end
local ups = ""
for k = i, #ref_ls do
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ups = ups .. ".." .. PATHSEP
end
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local rel_path = ups .. table.concat(dir_ls, PATHSEP, i)
return rel_path ~= "" and rel_path or "."
end
function common.mkdirp(path)
local stat = system.get_file_info(path)
if stat and stat.type then
return false, "path exists", path
end
local subdirs = {}
while path and path ~= "" do
local success_mkdir = system.mkdir(path)
if success_mkdir then break end
local updir, basedir = path:match("(.*)[/\\](.+)$")
table.insert(subdirs, 1, basedir or path)
path = updir
end
for _, dirname in ipairs(subdirs) do
path = path and path .. PATHSEP .. dirname or dirname
if not system.mkdir(path) then
return false, "cannot create directory", path
end
end
return true
end
function common.rm(path, recursively)
local stat = system.get_file_info(path)
if not stat or (stat.type ~= "file" and stat.type ~= "dir") then
return false, "invalid path given", path
end
if stat.type == "file" then
local removed, error = os.remove(path)
if not removed then
return false, error, path
end
else
local contents = system.list_dir(path)
if #contents > 0 and not recursively then
return false, "directory is not empty", path
end
for _, item in pairs(contents) do
local item_path = path .. PATHSEP .. item
local item_stat = system.get_file_info(item_path)
if not item_stat then
return false, "invalid file encountered", item_path
end
if item_stat.type == "dir" then
local deleted, error, ipath = common.rm(item_path, recursively)
if not deleted then
return false, error, ipath
end
elseif item_stat.type == "file" then
local removed, error = os.remove(item_path)
if not removed then
return false, error, item_path
end
end
end
local removed, error = system.rmdir(path)
if not removed then
return false, error, path
end
end
return true
end
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return common