directory tree -> array

Alex Tweedly alex at tweedly.net
Tue Feb 4 11:57:24 EST 2020


Hey Bob,

there's a problem in directoryListingToArray in some cases.

Wen I run it on my home directory, I get an error message

    ...: execution error at line 119 (repeat: error in statement), char 1

The 'repeat' error is misleading - that's just the line following the 
'do tCommand'.

It's caused because I have a file (I think created by Dropbox - but I'm 
not sure) which contains a control character (specifically, 
numtochar(13)) in its name. (it urlencodes to .../Dropbox/Icon%0D)

When this gets to your "do" command, it causes Livecode to stop with an 
error report, because the embedded "CR" gets the parser confused.

You can 'fix' it by adding

    replace numtochar(13) with "%0D" in tPath

at the appropriate place - but it's not clear if that's just storing up 
problems for the future.

(Just another reason to avoid 'do', and go with Ben's recursive solution 
straight into an array rather than getting a list and converting it. But 
if you do have a reason to convert a list, then you could come up with a 
way to do that without 'do' using a similar method to Ben's)

Alex.


On 03/02/2020 17:19, Bob Sneidar via use-livecode wrote:
> I already wrote some functions to do this but sent them to Richard in a demo stack. Here is the code based on directoryListing, which I believe is in the MasterLibrary. I made a minor adjustment to it if I recall. DirectoryListing was returning duplicate paths for each unique folder for some reason. I modified it to only return one unique path for a given folder.
>
> Setting the arrayData of a tree widget to the returned value of directoryListingToArray() function will yield the results you want.
> ...
> function directoryListingToArray pDirectoryList
>     put line 1 of pDirectoryList into tRoot
>     delete line 1 of pDirectoryList
>     set the itemDelimiter to "/"
>     put empty into aArrayData [tRoot]
>     
>     repeat for each line tPath in pDirectoryList
>        replace tRoot with empty in tPath
>        put "["  & quote before tPath
>        put quote & "]" after tPath
>        replace "/" with quote & "]" & space & "[" & quote in tPath
>        put "[" & quote & tRoot & quote & "] " before tPath
>        put "put empty into aArrayData " & tPath into tCommand
>        do tCommand
>     end repeat
>     
>     return aArrayData
> end directoryListingToArray
>
> Bob S
>
>
>> On Feb 1, 2020, at 13:16 , Dick Kriesel via use-livecode <use-livecode at lists.runrev.com> wrote:
>>
>>
>>> On Jan 22, 2020, at 10:17 AM, Richard Gaskin via use-livecode <use-livecode at lists.runrev.com> wrote:
>>>
>>> I stumbled across a code challenge for y'all, one that seems seductively simple but I don't think it is:
>>>
>>> What is the simplest way to build an array that reflects the files and folders within a given folder?
>>>
>>> There's a discussion about this here:
>>>
>>> https://forums.livecode.com/viewtopic.php?f=7&t=33565
>>>
>>>
>>> On Jan 22, 2020, at 10:26 AM, Richard Gaskin via use-livecode <use-livecode at lists.runrev.com> wrote:
>>> We have many handlers that deliver directory trees as lists, but arrays are a different beast.  Because the depth is both unknowable and varied, I can't think of a way to do this without resorting to "do".
>>
>>
>> Since that thread vanished last week, and hasn’t returned, I'm offering help here instead.
>>
>> The list of full paths contains enough information to build an array representation of the directory tree.
>>
>> <code>
>> /**
>>
>> Summary: Given a list of full paths, and given the partial path they share, build an array representing the directory structure
>>
>> pPaths: a return-delimited list of full paths
>>
>> pPath: the path that was used to generate the list of full paths
>>
>> Returns (array): A array with a branch node for each folder and a leaf node for each file
>>
>> Description: Eliminate pPath from every line of pPaths. Then insert each line into an array.
>>
>> email subject "directory tree -> array"
>>
>> forum topic "f=7&t=33565"
>>
>> */
>>
>>
>> function arrayFromPaths pPaths, pPath -- a list of full paths, and the path that was used to generate the list
>>
>> local tPaths, tFile, tArray
>>
>> set the itemDelimiter to "/"
>>
>>
>> put char 2 to -1 of replaceText( cr & pPaths, cr & pPath & slash, cr ) into tPaths -- eliminate pPath from every full path
>>
>> repeat for each line tPath in tPaths -- insert each file name into the array
>>
>> put the last item of tPath into tFile
>>
>> delete the last item of tPath
>>
>> if tPath is empty then -- the file is in folder pPath
>>
>> put "true" into tArray[ tFile ]
>>
>> else -- the file is in a folder in folder pPath
>>
>> split tPath by slash
>>
>> put "true" into tArray[ tPath ][ tFile ]
>>
>> end if
>>
>> end repeat
>>
>>
>> return tArray
>>
>> end arrayFromPaths
>>
>>
>> on mouseUp
>>
>> local tPaths = "a/b/c,a/b/d/e,a/b/d/f" -- folder a/b contains file c and folder d, which contains files e and f
>>
>> local tPath = "a/b" -- the shared partial path
>>
>> replace comma with cr in tPaths
>>
>>
>> get arrayFromPaths( tPaths, tPath )
>>
>>
>> breakpoint
>>
>> end mouseUp
>>
>>
>> </code>
>>
>> If the topic reappears soon, I’ll repost there because reading code is easier there.
>>
>> By, the way, thanks to RG for the bug report on my earlier posting in the now-vanished thread.
>>
>> — Dick
>>
>>
>>
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