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➜ MUSHclient
➜ Lua
➜ Returning directory contents
Returning directory contents
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Posted by
| Sketch-The-Fox
(19 posts) Bio
|
Date
| Sat 15 Apr 2006 02:16 AM (UTC) |
Message
| Haven't had a good deal of luck with this problem. I'd like a script that, given a directory, returns the five most recently modified files (or fewer if there are less than five files in a directory).
Any solutions? I'm well aware of utils.readdir, how tables work, and how to get the time of creation of a file... What's really screwing me is sorting the files by date. | Top |
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Posted by
| David Haley
USA (3,881 posts) Bio
|
Date
| Reply #1 on Sat 15 Apr 2006 07:30 AM (UTC) |
Message
| If you have a list of files, each of which has a time associated, sorting it is quite simple. Look at: http://lua-users.org/wiki/TableLibraryTutorial and search for table.sort. You'll want to use the version where you pass along a comparison function. You might want something like: function (a,b) return a.date < b.date end
or however you have stored your dates. |
David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | Top |
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Posted by
| Nick Gammon
Australia (23,133 posts) Bio
Forum Administrator |
Date
| Reply #2 on Sat 15 Apr 2006 09:08 AM (UTC) |
Message
| I love questions like this because they let me demonstrate the power of Lua. :)
To get the most recently modified files you clearly need to sort the file list. However in Lua sorting is done on numerically-keyed tables, so the first step is to copy the results from readdir into another table (using table.insert). We need to know the file name (which we can use as a key back into the original table) plus the date modified. The table.foreach call below does that.
Then we sort the new table with a custom sort function. I specify ">" instead of "<" in order to sort into descending order.
Now in this example it displays all my logs, in descending order (most recent first).
t = assert (utils.readdir ("c:/mushclient/logs/*.txt"))
t2 = {} -- table with file names and dates
table.foreach (t,
function (k, v)
table.insert (t2, { name = k, date = v.write_time } )
end )
table.sort (t2, function (v1, v2)
return v1.date > v2.date
end -- function
)
tprint (t2)
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- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
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