Variable-length foreach block of words

--============_-1241772622==_============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" Hi all! You can find attached a little (in)utility that contains a couple of interesting issues (at least, I believe so!) . You can find an example of a variable-length block of words supplied to the 'foreach' construct and the use of 'bind' to refer the single words in an inner 'foreach' loop. Since the context-binding issue is a bit hard one (to me, at least), I think this script could be useful to some beginner... in addiction to the enlightening reading of "REBOL, The Official Guide" ;) (BTW: great job, Elan. Really!) Obviously, I'll be very happy to learn something more, if someone tells me I'm totally dumb and that it exists a far simpler way to accomplish the same task. ;) In particular, I'm not happy about the way I had to force a result for the second 'try' clause in the no-error case to prevent 'error' to remain undefined. Here's the function, while the file attached contains a complete example. break-textfile: func [ {It breaks a main text-file in a number of text-files with a fixed number of lines. It returns the created files' number or a standard error object.} source-filename [string!] "The file to break" prefix [string!] "A seed for the files' name" storage-directory [string!] "The name of the storage directory" number-of-citizens-per-file [integer!] "The number of lines per file" /local counter citizens-group postfix ][ if error? error: try [citizens: read/lines to-file source-filename] [ return disarm error] counter: 0 citizens-group: [] for i 1 number-of-citizens-per-file 1 [ append citizens-group to-word join "a" i ] foreach :citizens-group citizens [ bind citizens-group 'a1 postfix: head either (length? to-string counter) = 1[insert to-string counter "0"][to-string counter] if error? error: try [ if not exists? join %"" storage-directory [make-dir join %"" storage-directory] filename: join %"" [storage-directory "/" prefix postfix] if exists? filename [delete filename] foreach citizen citizens-group [ if not none? get citizen [write/append filename rejoin [ get citizen newline]] ] "dummy value for 'try' to return" ] [ return disarm error ] counter: counter + 1 ] return counter ] --============_-1241772622==_============ Content-Id: <a05001901b5fc08743982@[151.15.108.177].0.0> Content-Type: text/plain; name="textfile-breaker.r"; charset="us-ascii" ; format="flowed" Content-Disposition: attachment; filename="textfile-breaker.r" ; modification-date="Sat, 30 Sep 2000 23:15:20 +0200" REBOL [ Title: "Text-File-breaker" Date: 30-sep-2000 Author: "Paolo Russo" Owner: "PERD s.r.l." Site: http://www.perd.com Email: [pa--russo--perd--com] File: %textfile-breaker.r Version: 1.0.0 Project: 'srr Purpose: { It breaks a main text-file in a set of text-files with a fixed number of lines. } Comments: { This script contains a couple of interesting issues (At least, I believe so!) . You can see an example of a variable-length block of words for the 'foreach' construct. In particular you can observe the use of 'bind' to refer the single words using a reference to the block in an inner 'foreach' loop. } History: [ 1.0.0 30-sep-2000 "Main layout" "Paolo Russo" ] Category: [script utility] Needs: [2.2] Language: 'English ] break-textfile: func [ {It breaks a main text-file in a number of text-files with a fixed number of lines. It returns the created files' number or a standard error object.} source-filename [string!] "The file to break" prefix [string!] "A seed for the files' name" storage-directory [string!] "The name of the storage directory" number-of-citizens-per-file [integer!] "The number of lines per file" /local counter citizens-group postfix ][ if error? error: try [citizens: read/lines to-file source-filename] [return disarm error] counter: 0 citizens-group: [] for i 1 number-of-citizens-per-file 1 [ append citizens-group to-word join "a" i ] foreach :citizens-group citizens [ bind citizens-group 'a1 postfix: head either (length? to-string counter) = 1[insert to-string counter "0"][to-string counter] if error? error: try [ if not exists? join %"" storage-directory [make-dir join %"" storage-directory] filename: join %"" [storage-directory "/" prefix postfix] if exists? filename [delete filename] foreach citizen citizens-group [ if not none? get citizen [write/append filename rejoin [ get citizen newline]] ] "dummy value for 'try' to return" ] [ return disarm error ] counter: counter + 1 ] return counter ] ; Collect params prefix: ask "Prefix for files to create: " source-filename: ask "Complete path to the file to split: " storage-directory: ask "Name of the storage directory: " until [ all [ not error? try [ number-of-lines-per-file: to-integer ask Number of lines per file [ > 0 ]: ] number-of-lines-per-file > 0 ] ] ; Execute function probe break-textfile source-filename prefix storage-directory number-of-lines-per-file --============_-1241772622==_============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" -- Paolo Russo [pa--russo--perd--com] _________________ PERD s.r.l. Virtual Technologies for Real Solutions http://www.perd.com --============_-1241772622==_============--