color on linux terminal

color on linux terminal

[Markus Weihs]

Hi,

to get coloured output on a linux terminal, you can do something like

    echo -e "\033[31m This is now red"

How can I do this with OCaml? The following doesn't work

    print_string "\033[31m blabla"


Thanks in advance,

Markus

Re: [Caml-list] color on linux terminal

[Daniel de Rauglaudre]

Hi,

On Sat, Jan 13, 2007 at 08:29:16PM +0000, Markus Weihs wrote:

> How can I do this with OCaml? The following doesn't work
>     print_string "\033[31m blabla"

print_string "\027[31m blabla"

Character codes are in decimal in OCaml, not in octal.

-- 
Daniel de Rauglaudre
http://pauillac.inria.fr/~ddr/

Re: [Caml-list] color on linux terminal

[Vu Ngoc San]

print_string "\027[31m Yes it is red";;


Markus Weihs a écrit :
> Hi,
> 
> to get coloured output on a linux terminal, you can do something like
> 
>     echo -e "\033[31m This is now red"
> 
> How can I do this with OCaml? The following doesn't work
> 
>     print_string "\033[31m blabla"
> 
> 
> Thanks in advance,
> 
> Markus
> 
> _______________________________________________
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> 


-- 
---
Vu Ngoc San			tel:04 76 63 58 53
Institut Fourier		e-mail:San.Vu-Ngoc@ujf-grenoble.fr
Universite Grenoble 1, BP 74	http://www-fourier.ujf-grenoble.fr/~svungoc
38402 Saint Martin d'Heres
France
---

Re: [Caml-list] color on linux terminal

[Eric Cooper]

On Sat, Jan 13, 2007 at 08:29:16PM +0000, Markus Weihs wrote:
> to get coloured output on a linux terminal, you can do something like
> 
>     echo -e "\033[31m This is now red"
> 
> How can I do this with OCaml? The following doesn't work
> 
>     print_string "\033[31m blabla"

This is my biggest "pet peeve" about OCaml.  It uses *decimal* escapes
for characters, not octal like everywhere else in the UNIX and
C-influenced universe.

So you want
     print_string "\027[31m blabla"

-- 
Eric Cooper             e c c @ c m u . e d u

Re: [Caml-list] color on linux terminal

[Goulagman]

[-- Attachment #1: Type: text/plain, Size: 463 bytes --]

On 13/01/07, Markus Weihs <mweihs@gmx.at> wrote:
>
> Hi,
>
> to get coloured output on a linux terminal, you can do something like
>
>     echo -e "\033[31m This is now red"
>
> How can I do this with OCaml? The following doesn't work
>
>     print_string "\033[31m blabla"


It's because, for Ocaml,   the escape sequence \0xx matches the ASCII
character xx in decimal, not in octal.

print_string "\027[31m blabla" works fine

Thanks in advance,
>
> Markus
>
>

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Re: color on linux terminal

[Markus Weihs]

> print_string "\027[31m blabla"

Whoa, that was quick! Thanks for all your answers.

Re: [Caml-list] color on linux terminal

[Philippe Wang]

On 13 janv. 07, at 21:56, Goulagman wrote:

> It's because, for Ocaml,   the escape sequence \0xx matches the  
> ASCII character xx in decimal, not in octal.
>
> print_string "\027[31m blabla" works fine
>

Well, what you said is true, still it's not meant to be explained  
like this ! (well I guess and hope so)

The backslash in a character or string sequence introduces a decimal  
number between 0 and 255 with *exactly* 3 digits.

You can also write special characters in hexadecimal :

"\xFF"  = "\255"

;-)

Re: [Caml-list] color on linux terminal

[Christophe TROESTLER]

On Sat, 13 Jan 2007, Markus Weihs <mweihs@gmx.at> wrote:
> 
> to get coloured output on a linux terminal, you can do something like
> 
>     echo -e "\033[31m This is now red"

You can also use ANSITerminal
<http://math.umh.ac.be/an/software.php#x4-90008>.

ChriS

Re: [Caml-list] color on linux terminal

[Florian Weimer]

* Eric Cooper:

> This is my biggest "pet peeve" about OCaml.  It uses *decimal* escapes
> for characters, not octal like everywhere else in the UNIX and
> C-influenced universe.

DNS and BIND use decimal escape sequences, too.

Re: [Caml-list] color on linux terminal

[Xavier Leroy]

> This is my biggest "pet peeve" about OCaml.  It uses *decimal* escapes
> for characters,

Hexadecimal is also supported ("\x1b[31m blabla") and highly recommended.

> not octal like everywhere else in the UNIX and C-influenced universe.

Well, how many fingers do you have? :-)  Octal is a left-over from the
PDP-11 days and should have been abandoned a long time ago.

- Xavier Leroy