Reading/Deleting Last Line Of File

[Alex Tweedly]

Jim Bufalini wrote:
> Richard Gaskin wrote:
>
>   
>> But FWIW, I tried your version and it seemed to leave the file
>> unchanged
>>     
>
> If your original file ends in a cr then Alex's code would end in absolutely
> no change. ;-)
>   
That's not what my testing showed (or appeared to show). Here's the 
short version of the test script, and the corresponding output
note the first example has a single final CR, the second has no CR and 
the third one has multiple CRs, and each is correctly truncated.

(I missed a few test cases here - empty file, single line of data, etc.  
but it is only "reasonably  tested")

The test stack can be downloaded from 
http://www.tweedly.org/deletelastline.rev
(btw - I don't currently have access to a mac, so it's only tested on 
Windows. Could that cause the different result for Richard ?)

> on mouseUp
>   
>    put empty into field "F"
>    put "abcdefg" & CR into t
>    put "1234567" & CR after t
>    put t into URL ("file:a,b.txt")
>    put "abcdefg" & CR into t
>    put "1234567"  after t
>    put t into URL ("file:b.txt")
>    put "abcdefg" & CR into t
>    put "1234567" & CR &CR after t
>    put t into URL ("file:c.txt")
>    putfile "a,b.txt"
>    deletelastline "a,b.txt"
>    putfile "a,b.txt"
>     
>    putfile "b.txt"
>    deletelastline "b.txt"
>    putfile "b.txt"
>    
>    putfile "c.txt"
>    deletelastline "c.txt"
>    putfile "c.txt"
> end mouseUp
>  
> on putfile p
>    put "file " && p & CR after field "F"
>    put URL ("file:" & P) after field "F"
>    put "endoffile" & CR after field "F"
> end putfile
>  
giving

> file  a,b.txt
> abcdefg
> 1234567
> endoffile
> file  a,b.txt
> abcdefg
> endoffile
> file  b.txt
> abcdefg
> 1234567endoffile
> file  b.txt
> abcdefendoffile
> file  c.txt
> abcdefg
> 1234567
>
> endoffile
> file  c.txt
> abcdefg
> 1234567
> endoffile

-- Alex.