X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/e0d4a89435d68714c0cee849625e0b14edca3d1c..8112df667d6c56dfec90695341f22af8718a6eb6:/helpers.lua diff --git a/helpers.lua b/helpers.lua index 7c44648..4d75f7b 100644 --- a/helpers.lua +++ b/helpers.lua @@ -1,23 +1,19 @@ - --[[ - - Licensed under GNU General Public License v2 - * (c) 2013, Luke Bonham - ---]] + Licensed under GNU General Public License v2 + * (c) 2013, Luca CPZ +--]] + +local spawn = require("awful.spawn") +local timer = require("gears.timer") local debug = require("debug") local io = { lines = io.lines, - open = io.open, - popen = io.popen } + open = io.open } +local pairs = pairs local rawget = rawget local table = { sort = table.sort } -local easy_async = require("awful.spawn").easy_async -local timer = require("gears.timer") -local wibox = require("wibox") - -- Lain helper functions for internal use -- lain.helpers local helpers = {} @@ -37,53 +33,49 @@ end -- {{{ File operations --- see if the file exists and is readable -function helpers.file_exists(file) - local f = io.open(file) - if f then - local s = f:read() - f:close() - f = s - end - return f ~= nil -end - --- get all lines from a file, returns an empty --- list/table if the file does not exist -function helpers.lines_from(file) - if not helpers.file_exists(file) then return {} end - local lines = {} - for line in io.lines(file) do - lines[#lines + 1] = line - end - return lines -end - --- match all lines from a file, returns an empty --- list/table if the file or match does not exist -function helpers.lines_match(regexp, file) - local lines = {} - for index,line in pairs(helpers.lines_from(file)) do - if string.match(line, regexp) then - lines[index] = line - end - end - return lines -end - --- get first line of a file, return nil if --- the file does not exist -function helpers.first_line(file) - return helpers.lines_from(file)[1] -end - --- get first non empty line from a file, --- returns nil otherwise -function helpers.first_nonempty_line(file) - for k,v in pairs(helpers.lines_from(file)) do - if #v then return v end - end - return nil +-- check if the file exists and is readable +function helpers.file_exists(path) + local file = io.open(path, "rb") + if file then file:close() end + return file ~= nil +end + +-- get a table with all lines from a file +function helpers.lines_from(path) + local lines = {} + for line in io.lines(path) do + lines[#lines + 1] = line + end + return lines +end + +-- get a table with all lines from a file matching regexp +function helpers.lines_match(regexp, path) + local lines = {} + for line in io.lines(path) do + if string.match(line, regexp) then + lines[#lines + 1] = line + end + end + return lines +end + +-- get first line of a file +function helpers.first_line(path) + local file, first = io.open(path, "rb"), nil + if file then + first = file:read("*l") + file:close() + end + return first +end + +-- get first non empty line from a file +function helpers.first_nonempty_line(path) + for line in io.lines(path) do + if #line then return line end + end + return nil end -- }}} @@ -110,27 +102,34 @@ end -- {{{ Pipe operations --- return the full output of an input command (synchronous pipe) --- @param cmd the input command --- @return command output (string) -function helpers.read_pipe(cmd) - local f = io.popen(cmd) - local output = f:read("*all") - f:close() - return output -end - -- run a command and execute a function on its output (asynchronous pipe) -- @param cmd the input command -- @param callback function to execute on cmd output -- @return cmd PID function helpers.async(cmd, callback) - return easy_async(cmd, + return spawn.easy_async(cmd, function (stdout, stderr, reason, exit_code) - callback(stdout) + callback(stdout, exit_code) end) end +-- like above, but call spawn.easy_async with a shell +function helpers.async_with_shell(cmd, callback) + return spawn.easy_async_with_shell(cmd, + function (stdout, stderr, reason, exit_code) + callback(stdout, exit_code) + end) +end + +-- run a command and execute a function on its output line by line +function helpers.line_callback(cmd, callback) + return spawn.with_line_callback(cmd, { + stdout = function (line) + callback(line) + end, + }) +end + -- }}} -- {{{ A map utility @@ -177,11 +176,25 @@ function helpers.spairs(t) end end --- create a textbox with no spacing issues -function helpers.make_widget_textbox() - local w = wibox.widget.textbox() - local t = wibox.widget.base.make_widget(w) - t.widget = w +-- create the partition of singletons of a given set +-- example: the trivial partition set of {a, b, c}, is {{a}, {b}, {c}} +function helpers.trivial_partition_set(set) + local ss = {} + for _,e in pairs(set) do + ss[#ss+1] = {e} + end + return ss +end + +-- creates the powerset of a given set +function helpers.powerset(s) + if not s then return {} end + local t = {{}} + for i = 1, #s do + for j = 1, #t do + t[#t+1] = {s[i],unpack(t[j])} + end + end return t end