helpers: improved i/o functions

This commit is contained in:
Luca CPZ 2018-02-23 13:24:10 +01:00
parent e81f46950b
commit 92d17d289c
1 changed files with 35 additions and 39 deletions

View File

@ -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
-- 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 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
-- 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
-- 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
-- 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, return nil if
-- the file does not exist
function helpers.first_line(file)
return helpers.lines_from(file)[1]
-- 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,
-- 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
-- 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
-- }}}