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From: InfnPi <rob...@pi...> - 2025-05-29 17:29:10
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Many thx!
Roberto
On 29 May 2025 at 19:27 +0200, Xavier Delaruelle <xav...@gm...>, wrote:
> Hello Roberto,
>
> The syntax with double quotes is fine, you have no special character
> in your text to escape:
>
> module-whatis "This module sets up software XXX $ver"
>
> You may use an internal variable to use this description at different places:
>
> set description "This module sets up software XXX $ver"
> module-whatis $description
> proc ModulesHelp {} {
> puts stderr $::description
> }
>
> For the color, I would use a "color" proc like you did, but I suggest
> to directly use ANSI SGR code [1] rather calling for tput:
>
> return "\033\[1;31m$text\033\[0m"
>
> Regards
> Xavier
>
> [1] https://en.wikipedia.org/wiki/ANSI_escape_code#Select_Graphic_Rendition_parameters
>
>
> Le jeu. 29 mai 2025 à 10:32, InfnPi <rob...@pi...> a écrit :
> >
> > Here we go with another question, due to my lack of tcl knowledge.
> >
> > What i would like to achieve is to be able to use variables in text printed to stderr inside a tcl command like module-whatis.
> >
> > Very often in modulefiles you have to refer to the same information in more than one place and therefore it is convenient to use a variable.
> >
> > as an example in a module installing tool XXX version YYY you write something like:
> >
> > module-whatis (This module sets up software XXX version YYY}
> >
> > and
> >
> > proc ModulesHelp {} {
> > puts stderr {This module sets up software XXX version YYY}
> > }
> >
> > Instead of writing "Version YYY" any times in different places it would be nice to be able to use:
> > set ver "Version YYY"
> > and then
> > module-whatis (This module sets up software XXX $ver}
> >
> > this would reduce errors and add maintainability to the modulefile, in the sense that if a new version ZZZ of software XXX comes out i would (probably) use the same modulefile just replacing a few general variables.
> >
> > Unfortunately in using
> > module-watis {This module sets up software XXX $ver} will not expand the variable $ver.
> >
> > A workaround i found is to write it in the following way:
> > module-whatis "This module sets up software XXX $ver"
> > which expands variables (but you have to escape special characters).
> >
> > Is this correct or does it have some unwanted consequences?
> >
> >
> > Along with this question there is a second one i would like to ask:
> >
> > Is there a way to print text to stderr using colors?
> >
> > I found a way to do it defining a procedure and some variables:
> >
> > proc color {color text} {
> > return [exec tput setaf $color]$text[exec tput sgr0]
> > }
> > set red 1
> > set green 2
> > set yellow 3
> > set blue 4
> >
> > and then in the module file i will use:
> > module-whatis "This module sets up software [color $green XXX] $ver"
> >
> > which will print XXX in green.
> >
> > Is there a native way to do the same?
> > Is it fine to use it in the way i described?
> >
> > Again, many thx in advance for all the answers.
> >
> > Roberto
>
>
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