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|
if not modules then modules = { } end modules ['l-io'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local io = io
local byte, find, gsub, format = string.byte, string.find, string.gsub, string.format
local concat = table.concat
local type = type
if string.find(os.getenv("PATH"),";") then
io.fileseparator, io.pathseparator = "\\", ";"
else
io.fileseparator, io.pathseparator = "/" , ":"
end
function io.loaddata(filename,textmode) -- return nil if empty
local f = io.open(filename,(textmode and 'r') or 'rb')
if f then
local data = f:read('*all')
f:close()
if #data > 0 then
return data
end
end
end
function io.savedata(filename,data,joiner)
local f = io.open(filename,"wb")
if f then
if type(data) == "table" then
f:write(concat(data,joiner or ""))
elseif type(data) == "function" then
data(f)
else
f:write(data or "")
end
f:close()
io.flush()
return true
else
return false
end
end
function io.loadlines(filename,n) -- return nil if empty
local f = io.open(filename,'r')
if f then
if n then
local lines = { }
for i=1,n do
local line = f:read("*lines")
if line then
lines[#lines+1] = line
else
break
end
end
f:close()
lines = concat(lines,"\n")
if #lines > 0 then
return lines
end
else
local line = f:read("*line") or ""
assert(f:close())
if #line > 0 then
return line
end
end
end
end
function io.loadchunk(filename,n)
local f = io.open(filename,'rb')
if f then
local data = f:read(n or 1024)
f:close()
if #data > 0 then
return data
end
end
end
function io.exists(filename)
local f = io.open(filename)
if f == nil then
return false
else
assert(f:close())
return true
end
end
function io.size(filename)
local f = io.open(filename)
if f == nil then
return 0
else
local s = f:seek("end")
assert(f:close())
return s
end
end
function io.noflines(f)
if type(f) == "string" then
local f = io.open(filename)
local n = f and io.noflines(f) or 0
assert(f:close())
return n
else
local n = 0
for _ in f:lines() do
n = n + 1
end
f:seek('set',0)
return n
end
end
local nextchar = {
[ 4] = function(f)
return f:read(1,1,1,1)
end,
[ 2] = function(f)
return f:read(1,1)
end,
[ 1] = function(f)
return f:read(1)
end,
[-2] = function(f)
local a, b = f:read(1,1)
return b, a
end,
[-4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
return d, c, b, a
end
}
function io.characters(f,n)
if f then
return nextchar[n or 1], f
end
end
local nextbyte = {
[4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
if d then
return byte(a), byte(b), byte(c), byte(d)
end
end,
[3] = function(f)
local a, b, c = f:read(1,1,1)
if b then
return byte(a), byte(b), byte(c)
end
end,
[2] = function(f)
local a, b = f:read(1,1)
if b then
return byte(a), byte(b)
end
end,
[1] = function (f)
local a = f:read(1)
if a then
return byte(a)
end
end,
[-2] = function (f)
local a, b = f:read(1,1)
if b then
return byte(b), byte(a)
end
end,
[-3] = function(f)
local a, b, c = f:read(1,1,1)
if b then
return byte(c), byte(b), byte(a)
end
end,
[-4] = function(f)
local a, b, c, d = f:read(1,1,1,1)
if d then
return byte(d), byte(c), byte(b), byte(a)
end
end
}
function io.bytes(f,n)
if f then
return nextbyte[n or 1], f
else
return nil, nil
end
end
function io.ask(question,default,options)
while true do
io.write(question)
if options then
io.write(format(" [%s]",concat(options,"|")))
end
if default then
io.write(format(" [%s]",default))
end
io.write(format(" "))
io.flush()
local answer = io.read()
answer = gsub(answer,"^%s*(.*)%s*$","%1")
if answer == "" and default then
return default
elseif not options then
return answer
else
for k=1,#options do
if options[k] == answer then
return answer
end
end
local pattern = "^" .. answer
for k=1,#options do
local v = options[k]
if find(v,pattern) then
return v
end
end
end
end
end
|
