lite-xl/data/core/common.lua

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local common = {}
---Checks if the byte at offset is a UTF-8 continuation byte.
---
---UTF-8 encodes code points in 1 to 4 bytes.
---For a multi-byte sequence, each byte following the start byte is a continuation byte.
---@param s string
---@param offset? integer The offset of the string to start searching. Defaults to 1.
---@return boolean
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
---Returns an iterator that yields a UTF-8 character on each iteration.
---@param text string
---@return fun(): string
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function common.utf8_chars(text)
return text:gmatch("[\0-\x7f\xc2-\xf4][\x80-\xbf]*")
end
---Clamps the number n between lo and hi.
---@param n number
---@param lo number
---@param hi number
---@return number
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function common.clamp(n, lo, hi)
return math.max(math.min(n, hi), lo)
end
---Returns a new table containing the contents of b merged into a.
---@param a table|nil
---@param b table?
---@return table
function common.merge(a, b)
a = type(a) == "table" and a or {}
local t = {}
for k, v in pairs(a) do
t[k] = v
end
if b and type(b) == "table" then
for k, v in pairs(b) do
t[k] = v
end
end
return t
end
---Returns the value of a number rounded to the nearest integer.
---@param n number
---@return number
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function common.round(n)
return n >= 0 and math.floor(n + 0.5) or math.ceil(n - 0.5)
end
---Returns the first index where a subtable in tbl has prop set.
---If none is found, nil is returned.
---@param tbl table
---@param prop any
---@return number|nil
function common.find_index(tbl, prop)
for i, o in ipairs(tbl) do
if o[prop] then return i end
end
end
---Returns a value between a and b on a linear scale, based on the
---interpolation point t.
---
---If a and b are tables, a table containing the result for all the
---elements in a and b is returned.
---@param a number
---@param b number
---@param t number
---@return number
---@overload fun(a: table, b: table, t: number): table
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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
---Returns the euclidean distance between two points.
---@param x1 number
---@param y1 number
---@param x2 number
---@param y2 number
---@return number
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function common.distance(x1, y1, x2, y2)
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return math.sqrt(((x2-x1) ^ 2)+((y2-y1) ^ 2))
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end
---Parses a CSS color string.
---
---Only these formats are supported:
---* `rgb(r, g, b)`
---* `rgba(r, g, b, a)`
---* `#rrggbbaa`
---* `#rrggbb`
---@param str string
---@return number r
---@return number g
---@return number b
---@return number a
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function common.color(str)
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local r, g, b, a = str:match("^#(%x%x)(%x%x)(%x%x)(%x?%x?)$")
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if r then
r = tonumber(r, 16)
g = tonumber(g, 16)
b = tonumber(b, 16)
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a = tonumber(a, 16) or 0xff
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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)
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a = (f() or 1) * 0xff
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else
error(string.format("bad color string '%s'", str))
end
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return r, g, b, a
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end
---Splices a numerically indexed table.
---This function mutates the original table.
---@param t any[]
---@param at number Index at which to start splicing.
---@param remove number Number of elements to remove.
---@param insert? any[] A table containing elements to insert after splicing.
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function common.splice(t, at, remove, insert)
assert(remove >= 0, "bad argument #3 to 'splice' (non-negative value expected)")
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insert = insert or {}
local len = #insert
if remove ~= len then table.move(t, at + remove, #t + remove, at + len) end
table.move(insert, 1, len, at, t)
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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
---Performs fuzzy matching.
---
---If the haystack is a string, a score ranging from 0 to 1 is returned. </br>
---If the haystack is a table, a table containing the haystack sorted in ascending
---order of similarity is returned.
---@param haystack string
---@param needle string
---@param files boolean If true, the matching process will be performed in reverse to better match paths.
---@return number
---@overload fun(haystack: string[], needle: string, files: boolean): string[]
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
---Performs fuzzy matching and returns recently used strings if needed.
---
---If the needle is empty, then a list of recently used strings
---are added to the result, followed by strings from the haystack.
---@param haystack string[]
---@param recents string[]
---@param needle string
---@return string[]
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
---Returns a list of paths that are relative to the input path.
---
---If a root directory is specified, the function returns paths
---that are relative to the root directory.
---@param text string The input path.
---@param root? string The root directory.
---@return string[]
function common.path_suggest(text, root)
if root and root:sub(-1) ~= PATHSEP then
root = root .. PATHSEP
end
local path, name = text:match("^(.-)([^:/\\]*)$")
local clean_dotslash = false
-- ignore root if path is absolute
local is_absolute = common.is_absolute_path(text)
if not is_absolute then
if path == "" then
path = root or "."
clean_dotslash = not root
else
path = (root or "") .. path
end
end
-- Only in Windows allow using both styles of PATHSEP
if (PATHSEP == "\\" and not string.match(path:sub(-1), "[\\/]")) or
(PATHSEP ~= "\\" and path:sub(-1) ~= PATHSEP) then
path = path .. PATHSEP
end
local files = system.list_dir(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 root then
-- remove root part from file path
local s, e = file:find(root, nil, true)
if s == 1 then
file = file:sub(e + 1)
end
elseif clean_dotslash then
-- remove added dot slash
local s, e = file:find("." .. PATHSEP, nil, true)
if s == 1 then
file = file:sub(e + 1)
end
end
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if file:lower():find(text:lower(), nil, true) == 1 then
table.insert(res, file)
end
end
end
return res
end
---Returns a list of directories that are related to a path.
---@param text string The input path.
---@return string[]
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function common.dir_path_suggest(text)
local path, name = text:match("^(.-)([^:/\\]*)$")
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local files = system.list_dir(path == "" and "." or path) or {}
local res = {}
for _, file in ipairs(files) do
file = path .. file
local info = system.get_file_info(file)
if info and info.type == "dir" and file:lower():find(text:lower(), nil, true) == 1 then
table.insert(res, file)
end
end
return res
end
---Filters a list of paths to find those that are related to the input path.
---@param text string The input path.
---@param dir_list string[] A list of paths to filter.
---@return string[]
function common.dir_list_suggest(text, dir_list)
local path, name = text:match("^(.-)([^:/\\]*)$")
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
---Matches a string against a list of patterns.
---
---If a match was found, its start and end index is returned.
---Otherwise, false is returned.
---@param text string
---@param pattern string|string[]
---@param ... any Other options for string.find().
---@return number|boolean start_index
---@return number|nil end_index
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
---Draws text onto the window.
---The function returns the X and Y coordinates of the bottom-right
---corner of the text.
---@param font renderer.font
---@param color renderer.color
---@param text string
---@param align string
---| '"left"' # Align text to the left of the bounding box
---| '"right"' # Align text to the right of the bounding box
---| '"center"' # Center text in the bounding box
---@param x number
---@param y number
---@param w number
---@param h number
---@return number x_advance
---@return number y_advance
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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()
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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
---Prints the execution time of a function.
---
---The execution time and percentage of frame time
---for the function is printed to standard output. </br>
---The frame rate is always assumed to be 60 FPS, thus
---a value of 100% would mean that the benchmark took
---1/60 of a second to execute.
---@param name string
---@param fn fun(...: any): any
---@return any # The result returned by the function
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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
local function serialize(val, pretty, indent_str, escape, sort, limit, level)
local space = pretty and " " or ""
local indent = pretty and string.rep(indent_str, level) or ""
local newline = pretty and "\n" or ""
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if type(val) == "string" then
local out = string.format("%q", val)
if escape then
out = string.gsub(out, "\\\n", "\\n")
out = string.gsub(out, "\\7", "\\a")
out = string.gsub(out, "\\8", "\\b")
out = string.gsub(out, "\\9", "\\t")
out = string.gsub(out, "\\11", "\\v")
out = string.gsub(out, "\\12", "\\f")
out = string.gsub(out, "\\13", "\\r")
end
return out
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elseif type(val) == "table" then
-- early exit
if level >= limit then return tostring(val) end
local next_indent = pretty and (indent .. indent_str) or ""
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local t = {}
for k, v in pairs(val) do
table.insert(t,
next_indent .. "[" ..
serialize(k, pretty, indent_str, escape, sort, limit, level + 1) ..
"]" .. space .. "=" .. space .. serialize(v, pretty, indent_str, escape, sort, limit, level + 1))
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end
if #t == 0 then return "{}" end
if sort then table.sort(t) end
return "{" .. newline .. table.concat(t, "," .. newline) .. newline .. indent .. "}"
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end
return tostring(val)
end
---@class common.serializeoptions
---@field pretty boolean Enables pretty printing.
---@field indent_str string The indentation character to use. Defaults to `" "`.
---@field escape boolean Uses normal escape characters ("\n") instead of decimal escape sequences ("\10").
---@field limit number Limits the depth when serializing nested tables. Defaults to `math.huge`.
---@field sort boolean Sorts the output if it is a sortable table.
---@field initial_indent number The initial indentation level. Defaults to 0.
---Serializes a value into a Lua string that is loadable with load().
---
---Only these basic types are supported:
---* nil
---* boolean
---* number (except very large numbers and special constants, e.g. `math.huge`, `inf` and `nan`)
---* integer
---* string
---* table
---
---@param val any
---@param opts? common.serializeoptions
---@return string
function common.serialize(val, opts)
opts = opts or {}
local indent_str = opts.indent_str or " "
local initial_indent = opts.initial_indent or 0
local indent = opts.pretty and string.rep(indent_str, initial_indent) or ""
local limit = (opts.limit or math.huge) + initial_indent
return indent .. serialize(val, opts.pretty, indent_str,
opts.escape, opts.sort, limit, initial_indent)
end
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---Returns the last portion of a path.
---@param path string
---@return string
function common.basename(path)
-- a path should never end by / or \ except if it is '/' (unix root) or
-- 'X:\' (windows drive)
return path:match("[^\\/]+$") or path
end
---Returns the directory name of a path.
---If the path doesn't have a directory, this function may return nil.
---@param path string
---@return string|nil
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function common.dirname(path)
return path:match("(.+)[:\\/][^\\/]+$")
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end
---Returns a path where the user's home directory is replaced by `"~"`.
---@param text string
---@return string
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 $HOME and some characters following.
if string.find(text, PATHSEP, dir_pos, true) == dir_pos and #text > dir_pos then
return "~" .. text:sub(dir_pos)
end
end
return text
end
---Returns a list of paths where the user's home directory is replaced by `"~"`.
---@param paths string[] A list of paths to encode
---@return string[]
function common.home_encode_list(paths)
local t = {}
for i = 1, #paths do
t[i] = common.home_encode(paths[i])
end
return t
end
---Expands the `"~"` prefix in a path into the user's home directory.
---This function is not guaranteed to return an absolute path.
---@param text string
---@return string
function common.home_expand(text)
if text == nil then
return HOME
end
return HOME and text:gsub("^~", HOME) or text
end
local function split_on_slash(s, sep_pattern)
local t = {}
if s:match("^[/\\]") then
t[#t + 1] = ""
end
for fragment in string.gmatch(s, "([^/\\]+)") do
t[#t + 1] = fragment
end
return t
end
---Normalizes the drive letter in a Windows path to uppercase.
---This function expects an absolute path, e.g. a path from `system.absolute_path`.
---
---This function is needed because the path returned by `system.absolute_path`
---may contain drive letters in upper or lowercase.
---@param filename string|nil The input path.
---@return string|nil
function common.normalize_volume(filename)
if not filename then return end
if PATHSEP == '\\' then
local drive, rem = filename:match('^([a-zA-Z]:\\)(.-)'..PATHSEP..'?$')
if drive then
return drive:upper() .. rem
end
end
return filename
end
---Normalizes a path into the same format across platforms.
---
---On Windows, all drive letters are converted to uppercase.
---UNC paths with drive letters are converted back to ordinary Windows paths.
---All path separators (`"/"`, `"\\"`) are converted to platform-specific ones.
---@param filename string|nil
---@return string|nil
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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
---Checks whether a path is absolute or relative.
---@param path string
---@return boolean
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function common.is_absolute_path(path)
return path:sub(1, 1) == PATHSEP or path:match("^(%a):\\") or path:match('^(%w*):')
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end
---Checks whether a path belongs to a parent directory.
---@param filename string The path to check.
---@param path string The parent path.
---@return boolean
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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
---Checks whether a path is relative to another path.
---@param ref_dir string The path to check against.
---@param dir string The input path.
---@return boolean
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
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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
---Creates a directory recursively if necessary.
---@param path string
---@return boolean success
---@return string|nil error
---@return string|nil path The path where an error occured.
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
---Removes a path.
---@param path string
---@param recursively boolean If true, the function will attempt to remove everything in the specified path.
---@return boolean success
---@return string|nil error
---@return string|nil path The path where the error occured.
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