Re: Lua Cookbook
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- Subject: Re: Lua Cookbook
- From: Sean Conner <sean@...>
- Date: Thu, 6 Jan 2011 17:11:05 -0500
It was thus said that the Great Marc Balmer once stated:
> Guys, we are talking about licenses and stuff. But we should write recipes.
>
> What the fuck is wrong with us? IANAL, GPL, MIT, CC3A, WHATEVER.
>
> I write a piece of text. I am the author. I own the copyright for the
> next 70 years. I allow the "Lua Cookbook" project to use my text for
> inclusion in an electronic or paper version of the Cookbook.
>
> Do we want to continue talking fucking legalese stuff none of us
> understands really or do we start to do the job and write that cookbook?
So, a sample "recipie" for the Cookbook:
Recipie #1
Pretty Print The Contents Of A Table (non-recursive)
Author: Sean Conner
Website: http://example.net/lua/table/show.lua
License: LGPL
The following function takes a table and prints out the contents of each
entry, formatted for a terminal width of 80 characters. Given a nil, it
will print out the contents of _G (the global environment). Possibly more
verbiage here and what not ...
function show(l)
local l = l or _G
local maxkeylen = 0
local maxvallen = 0
local function conv_cntl(s)
if s == "\n" then
return "\\n"
else
return "\\?"
end
end
for k,v in pairs(l)
do
maxkeylen = math.max(maxkeylen,string.len(tostring(k)))
maxvallen = math.max(maxvallen,string.len(string.format("%q",tostring(v))))
end
----------------------------------------------------
-- clip the value portion to both the key and the
-- value will display without wrapping in an 80
-- column screen. Also, the Lua runtime does not
-- support formats longer than 99 characters wide.
-----------------------------------------------------
maxkeylen = math.min(30,maxkeylen)
maxvallen = math.min(77 - maxkeylen,maxvallen)
local format = string.format("%%-%ds %%-%ds",maxkeylen + 1,maxvallen + 1)
for k,v in pairs(l)
do
local vt
if type(v) == "string" then
vt = string.format("%q",v)
else
vt = tostring(v)
end
vt = string.gsub(vt,"%c",conv_cntl)
vt = string.sub(vt,1,maxvallen)
print(string.format(format,tostring(k),vt))
end
end
Sequences of recipies can be grouped by topic (say, manipulating tables,
processing strings, etc).
-spc
- References:
- Re: Lua Cookbook, Marc Balmer
- Re: Lua Cookbook, Luiz Henrique de Figueiredo
- Re: Lua Cookbook, KHMan
- Re: Lua Cookbook, Tony Finch
- Re: Lua Cookbook, KHMan
- Re: Lua Cookbook, Tony Finch
- Re: Lua Cookbook, KHMan
- Re: Lua Cookbook, Tony Finch
- Re: Lua Cookbook, KHMan
- Re: Lua Cookbook, Marc Balmer