• Bloris (31/31) Nov 16 2020 I've to convert a linux dash script because it is too slow and i
• Jack (8/39) Nov 16 2020 regex you can use std.regex module

Bloris <loris.salvi pm.me> writes:

I've to convert a linux dash script because it is too slow and i 
decded to do it in D. I'm totally new to this and i think it 
could be a good exercise to learn this language.

The shell script does some simple jobs like:
0) Run the script with some options
1) sed/grep regex to catch a portion of a file.
     For example: it finds the line that match "1234" and take all 
the lines until the line that match "abcd".
2) sed regex to catch some strings

"some text"
3) Creates dirs and copy files
4) Add specific char to a specific column position at every row 
of a file
     Original file:
     abcdefghij
     1234567890
     c34vt59erj
     04jèoàòr4t
     14sdf7g784

     Edited file:
     ab;cde;f;g;hij
     12;345;6;7;890
     c3;4vt;5;9;erj
     04;jèo;à;ò;r4t
     14;sdf;7;g;784

I would like to know what could be the best approach i would have 
to take with D to write simple, elegant and fast code, scanning 
files with more than 3000+ columns per line.

Thank you,
Loris

Jack <jckj33 gmail.com> writes:

On Monday, 16 November 2020 at 10:51:51 UTC, Bloris wrote:
 I've to convert a linux dash script because it is too slow and 
 i decded to do it in D. I'm totally new to this and i think it 
 could be a good exercise to learn this language.

 The shell script does some simple jobs like:
 0) Run the script with some options
 1) sed/grep regex to catch a portion of a file.
     For example: it finds the line that match "1234" and take 
 all the lines until the line that match "abcd".
 2) sed regex to catch some strings

 and "some text"
 3) Creates dirs and copy files
 4) Add specific char to a specific column position at every row 
 of a file
     Original file:
     abcdefghij
     1234567890
     c34vt59erj
     04jèoàòr4t
     14sdf7g784

     Edited file:
     ab;cde;f;g;hij
     12;345;6;7;890
     c3;4vt;5;9;erj
     04;jèo;à;ò;r4t
     14;sdf;7;g;784

 I would like to know what could be the best approach i would 
 have to take with D to write simple, elegant and fast code, 
 scanning files with more than 3000+ columns per line.

 Thank you,
 Loris

regex you can use std.regex module 
https://dlang.org/phobos/std_regex.html
IO stuff, read files, creatoe folders, etc: 
https://devdocs.io/d/std_stdio
I'm not sure about performance, if you find it be slow, maybe 
there are something better at https://code.dlang.org/ it also 
depends on your algorithm/code, of course