Re: [Fish-users] running functions in background

[Kurtis Rader]

Also, if the function does not modify the state of the current shell, and
you want to be able to run it in the background, there is a simple
solution. Simply create a shell script that runs the function.

On Sun, Sep 24, 2017 at 4:44 PM, Mark Volkmann 
wrote:

> I see that can enter a command name (referring to an executable script
> file in PATH) followed by & to run it in the background, but the same
> doesn't seem to work with function names. Is there a reason why those are
> treated differently?
>
> --
> R. Mark Volkmann
> Object Computing, Inc.
>
> 
> --
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Re: [Fish-users] running functions in background

[Kurtis Rader]

On Sun, Sep 24, 2017 at 4:44 PM, Mark Volkmann 
wrote:

> I see that can enter a command name (referring to an executable script
> file in PATH) followed by & to run it in the background, but the same
> doesn't seem to work with function names. Is there a reason why those are
> treated differently?
>

Mostly because doing so is ill-defined and can result in unexpected
results. If the function modifies the state of the shell running it in the
background (i.e., like an external command) would mean it cannot do so.
Create the following function in bash (or zsh, etc.). Then type `x=abc; x;
echo $x`. Then type `x=abc`, `x&`, then `echo $x`. Notice the difference?

x() {
x=def
}

The only way to do this sensibly is to simulate running it in the
background by running it in a separate thread. There's an open issue
discussing this. Someone just needs to write the code to implement the idea
:-)

-- 
Kurtis Rader
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Re: [Fish-users] string functions on strings that start with a dash

[Alex Boisvert]

Use "--" (double-dash), which is used to indicate the end of command
options, after which only positional parameters are accepted.

This works:

set firstChar (string sub -s1 -l1 -- "$text")


On Sun, Sep 24, 2017 at 5:47 PM, Mark Volkmann 
wrote:
>
> Suppose I have this:
> set text '-foo'
>
> How can I determine whether the first character of the string in $text is
a dash?
> I tried this:
> set firstChar (string sub -s1 -l1 "$text")
>
> But that doesn't work because "string sub" thinks I'm trying to specify
another switch since $text starts with a dash, and of course "-foo" is not
a valid switch for "string sub".
>
> --
> R. Mark Volkmann
> Object Computing, Inc.
>
>
--
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
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[Fish-users] string functions on strings that start with a dash

[Mark Volkmann]

Suppose I have this:
set text '-foo'

How can I determine whether the first character of the string in $text is a
dash?
I tried this:
set firstChar (string sub -s1 -l1 "$text")

But that doesn't work because "string sub" thinks I'm trying to specify
another switch since $text starts with a dash, and of course "-foo" is not
a valid switch for "string sub".

-- 
R. Mark Volkmann
Object Computing, Inc.
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[Fish-users] running functions in background

[Mark Volkmann]

I see that can enter a command name (referring to an executable script file
in PATH) followed by & to run it in the background, but the same doesn't
seem to work with function names. Is there a reason why those are treated
differently?

-- 
R. Mark Volkmann
Object Computing, Inc.
--
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