0000352: have ocaml support the '-' option (for standard input)

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0000352

OCaml

OCaml general

public

2001-05-04 11:42

2011-12-30 17:29

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administrator

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doligez

Priority

normal

Severity

feature

Reproducibility

always

Status

closed

Resolution

fixed

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Fixed in Version

3.13.0+dev

Summary

0000352: have ocaml support the '-' option (for standard input)

Description

Full_Name: Sven Luther
Version: 3.01
OS: debian GNU/linux
Submission from: lambda.u-strasbg.fr (130.79.90.63)

Note : this is a feature wish, i didn't find the 'priority' entry in the bug
fill form, so ...

Hello, ...

I wanted to run the labgltk examples from the lablgtk debian package, they are
on a read only directory, and some of them are compressed.

it is easy to run the uncompressed ones (lablgtk -labels file.ml), but not so
easy to run the compressed ones.

I thought it would be nice to be able to do as follows :

gunzip -c file.ml.gz | lablgtk -labels -

but ocaml clearly don't support this syntax yet.

I know about at least 2 workaround :

1) under bash you cna do :

(gunzip -c testgtk.ml.gz; echo ";;") | lablgtk -labels

but this will scroll up the display, and is not so nice.

2) you can also do :

gunzip -c testgtk.ml.gz | lablgtk -labels /dev/fd/0

but i don't think this is the nicest of solutions

3) it could be possible also to patch toplevel/toploop.ml,changing :

< let filename = find_in_path !Config.load_path name in
< let ic = open_in_bin filename in

to :

> let (filename, ic) =
> if name = "-" then
> (name, stdin)
> else
> let filename = find_in_path !Config.load_path name in
> (filename, open_in_bin_filename) in

or something such more appropriate.

Thanks to Nicolas GEORGE <nicolas.george@ens.fr>, for hinting me to those and
provide the (untested) patch.

What do you think of it ? Is this something that would be a nice addition to
ocaml, or is it not worth it, to difficult to do ?

Also you could link ocaml with zlib, so as to be able to read compressed files
directly, but i don't know if it is worth it.

Friendly,

Sven Luther
(Thanks to

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Notes
(0000108) administrator (administrator) 2002-11-13 15:39	Looks good. To be implemented.

(0006568) doligez (manager) 2011-12-30 17:29	[speaking for the OCaml toplevel rather than labltk] The "-" syntax is already used by this option: - <file> Treat <file> as a file name (even if it starts with `-') So I have implemented it as a "-stdin" option. Implemented in trunk (3.13).

Issue History
Date Modified	Username	Field	Change
2005-11-18 10:13	administrator	New Issue
2011-12-30 17:12	doligez	Assigned To	=> doligez
2011-12-30 17:12	doligez	Status	acknowledged => assigned
2011-12-30 17:29	doligez	Note Added: 0006568
2011-12-30 17:29	doligez	Status	assigned => closed
2011-12-30 17:29	doligez	Resolution	open => fixed
2011-12-30 17:29	doligez	Fixed in Version	=> 3.13.0+dev
2011-12-30 17:29	doligez	Description Updated	View Revisions