419 posts
Location
your hardrive
Posted 25 May 2013 - 12:24 PM
http://pastebin.com/RN3STjszthis simple program prints the contents of a file to the screen
i wrote this because its a fun command to play with(on linux) and its not default for comutercraft like alot of other commands
451 posts
Location
The left part of this post
Posted 25 May 2013 - 03:30 PM
One with scrolling:
local screen = {}
local scroll = 1
function clear()
term.clear()
for scroll, #screen do print(screen[i]) end
end
args = {...}
file = fs.open(args[1], "r")
local lines = file.readLine()
for lines in file.readLine do
table.insert(screen,lines)
end
print("Press a key to show")
os.pullEvent("key")
while true do
clear()
evt, s = os.pullEventRaw()
if evt=="char" and s=="w" then scroll = scroll-1 end
if evt=="char" and s=="s" then scroll = scroll+1 end
if evt=="mouse_scroll" and s > 0 then scroll = scroll+math.abs(s) end
if evt=="mouse_scroll" and s < 0 then scroll = scroll-math.abs(s)
end
Not tested but should work for advanced computers and normal ones(with w and s instead of scrolling)
19 posts
Posted 28 May 2013 - 02:49 PM
Now that we're at posting alternatives, here's one that behaves more like cat in UNIX/Linux:
local args = { ... }
local file = nil
if #args > 1 then
print("Usage: cat [file]")
return
end
if #args == 1 then
local f = args[1]
if not fs.exists(f) then
print("cat: " .. f .. ": No such file")
return
end
if fs.isDir(f) then
print("cat: " .. f .. ": Is a directory")
end
file = fs.open(f, 'r')
end
local line = nil
while true do
if file ~= nil then
line = file.readLine()
else
line = read()
end
if line ~= nil then
print(line)
else
return
end
end
808 posts
Posted 28 May 2013 - 09:08 PM
EDIT: Nevermind. But this might be useful.
419 posts
Location
your hardrive
Posted 30 May 2013 - 11:28 AM
Now that we're at posting alternatives, here's one that behaves more like cat in UNIX/Linux:
local args = { ... }
local file = nil
if #args > 1 then
print("Usage: cat [file]")
return
end
if #args == 1 then
local f = args[1]
if not fs.exists(f) then
print("cat: " .. f .. ": No such file")
return
end
if fs.isDir(f) then
print("cat: " .. f .. ": Is a directory")
end
file = fs.open(f, 'r')
end
local line = nil
while true do
if file ~= nil then
line = file.readLine()
else
line = read()
end
if line ~= nil then
print(line)
else
return
end
end
ah i forgot my basic file errors
587 posts
Location
Wrocław, Poland
Posted 01 June 2013 - 05:47 PM
Shrank your code (with file error handling):
args = {...}
if not args[1] then
print("Usage: cat [file]")
return
end
local f = fs.open(args[1], "r") or error("Error while opening file!")
print(f.readAll())
f.close()
4 posts
Posted 15 June 2013 - 07:38 AM
if evt=="mouse_scroll" and s > 0 then scroll = scroll+math.abs(s) end
if evt=="mouse_scroll" and s < 0 then scroll = scroll-math.abs(s)
end
can be simplified to this:
if evt == "mouse_scroll" then scroll = scroll + s end
:)/>
587 posts
Location
Wrocław, Poland
Posted 15 June 2013 - 12:34 PM
You shall do no necromancy…
1522 posts
Location
The Netherlands
Posted 16 June 2013 - 05:50 PM
Shrank your code (with file error handling):
args = {...}
if not args[1] then
print("Usage: cat [file]")
return
end
local f = fs.open(args[1], "r") or error("Error while opening file!")
print(f.readAll())
f.close()
However it does work, I'd rather use this:
local f = assert( fs.open( args[1], 'r' ), 'error while etc.')
587 posts
Location
Wrocław, Poland
Posted 17 June 2013 - 05:12 AM
Same thing
7508 posts
Location
Australia
Posted 17 June 2013 - 05:14 AM
Same thing
but Engineer's method is a little easier to read.
587 posts
Location
Wrocław, Poland
Posted 17 June 2013 - 05:37 AM
I wouldn't say so :P/>
1029 posts
Location
Missouri, United States, America, Earth, Solar System, Milky Way, Universe 42B, Life Street, Multiverse, 4th Dimension
Posted 17 June 2013 - 12:11 PM
Yeah, I can actually read killer's better.
587 posts
Location
Wrocław, Poland
Posted 17 June 2013 - 12:15 PM
jesus's not killer's :P/>
808 posts
Posted 17 June 2013 - 07:56 PM
Shrank your code (with file error handling):
args = {...}
if not args[1] then
print("Usage: cat [file]")
return
end
local f = fs.open(args[1], "r") or error("Error while opening file!")
print(f.readAll())
f.close()
However it does work, I'd rather use this:
local f = assert( fs.open( args[1], 'r' ), 'error while etc.')
I wish fs.open returned [handle], [reason for error] so that you could simply do assert(fs.open(path, mode)), and it would automatically error with the proper error message that gives complete detail of the problem instead of some generic error.
587 posts
Location
Wrocław, Poland
Posted 18 June 2013 - 03:02 AM
Write your own fs.open then
1522 posts
Location
The Netherlands
Posted 18 June 2013 - 03:05 AM
Shrank your code (with file error handling):
args = {...}
if not args[1] then
print("Usage: cat [file]")
return
end
local f = fs.open(args[1], "r") or error("Error while opening file!")
print(f.readAll())
f.close()
However it does work, I'd rather use this:
local f = assert( fs.open( args[1], 'r' ), 'error while etc.')
I wish fs.open returned [handle], [reason for error] so that you could simply do assert(fs.open(path, mode)), and it would automatically error with the proper error message that gives complete detail of the problem instead of some generic error.
With a little bit of creativity, this should give you an error:
local ok, err = pcall( function()
local file = fs.open("hi", "r")
file.close()
end)
if not ok then error(err, 2 ) end
However, this is kind of pointless. If you want a real error, you just do:
local file = fs.open("hi","r")
That would error on itself already..
36 posts
Posted 18 June 2013 - 07:16 AM
Does it work in an OS, and do u allow it into my OS?
587 posts
Location
Wrocław, Poland
Posted 18 June 2013 - 08:20 AM
If you can't make so simple program, don't make OS…
1114 posts
Location
UK
Posted 26 July 2013 - 05:20 PM
Sorry admins about this necro.
Does anyone know that cat is designed to concatenate multiple files, like this?
args = {...}
str = ""
for i = 1, #args do
h = fs.open(args[i], "r") or error("Failed to open file", 0)
str = str .. h.readAll()
h.close()
end
print(str)
139 posts
Location
Vilnius,Lithuania
Posted 28 July 2013 - 03:56 AM
You just can make this:
- Put cat to etc: /.cat
- then write to next file:
shell.clearAlias("cat")
shell.setAlias("cat", "cat file")
What do this done?
- Maked cat command for shell you will can run it anywhere!
Can i have +R3P, bro