From: Luca CPZ Date: Fri, 23 Feb 2018 12:24:10 +0000 (+0100) Subject: helpers: improved i/o functions X-Git-Url: https://git.madduck.net/etc/awesome.git/commitdiff_plain/92d17d289c64eb8416a881e4fe0113a64b534003 helpers: improved i/o functions --- diff --git a/helpers.lua b/helpers.lua index fb71335..4d75f7b 100644 --- a/helpers.lua +++ b/helpers.lua @@ -33,53 +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 -- }}}