option to show file:line everytime echo is called?

option to show file:line everytime echo is called?

[Timothee Cour]

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is there an option to show file:line everytime echo is called? eg:

set -magic_echo_option

echo myvr=$myvar #assuming this is at line 19

#shows:

/home/timothee/.zshrc:19 myvar=FOO

if impossible what would be a workaround ? or another command that does
this?

Re: option to show file:line everytime echo is called?

[Peter Stephenson]

On Mon, 9 Jan 2017 15:55:08 -0800
Timothee Cour <timothee.cour2@gmail.com> wrote:
> is there an option to show file:line everytime echo is called? eg:
> 
> set -magic_echo_option
> 
> echo myvr=$myvar #assuming this is at line 19
> 
> #shows:
> 
> /home/timothee/.zshrc:19 myvar=FOO

"set -x" does this in most shells.

You can change the information by altering the variable PS4, but it's
probably good enough.

pws

Re: option to show file:line everytime echo is called?

[Timothee Cour]

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Thanks; `set -x` is rather verbose, is there any other way to just alter
echo to show file:line (or similar) ?


On Tue, Jan 10, 2017 at 1:30 AM, Peter Stephenson <p.stephenson@samsung.com>
wrote:

> On Mon, 9 Jan 2017 15:55:08 -0800
> Timothee Cour <timothee.cour2@gmail.com> wrote:
> > is there an option to show file:line everytime echo is called? eg:
> >
> > set -magic_echo_option
> >
> > echo myvr=$myvar #assuming this is at line 19
> >
> > #shows:
> >
> > /home/timothee/.zshrc:19 myvar=FOO
>
> "set -x" does this in most shells.
>
> You can change the information by altering the variable PS4, but it's
> probably good enough.
>
> pws
>

Re: option to show file:line everytime echo is called?

[Peter Stephenson]

On Tue, 10 Jan 2017 03:22:00 -0800
Timothee Cour <timothee.cour2@gmail.com> wrote:
> Thanks; `set -x` is rather verbose, is there any other way to just alter
> echo to show file:line (or similar) ?

OK, you have an *explicit* echo, and you want to add some more
information to it by hand?  You don't want the shell to output
information automatically, as I assumed?

You can output the information from $PS4 by using "print -P".  So for
example

print -P $PS4 Got to this bit.

Prompt sequences are expanded but anything else is printed as normal.

pws

Re: option to show file:line everytime echo is called?

[Anthony Heading]

On Mon, Jan 09, 2017 at 03:55:08PM -0800, Timothee Cour wrote:
> is there an option to show file:line everytime echo is called? eg:
> echo myvr=$myvar #assuming this is at line 19
> #shows:
> /home/timothee/.zshrc:19 myvar=FOO

Maybe use an alias?

#!/bin/env zsh
alias echo='echo ${0:A}:$LINENO'

myvar=FOO

echo myvr=$myvar #this seems actually to be line 6


prints

/home/ajrh/x:6 myvr=FOO

Re: option to show file:line everytime echo is called?

[Timothee Cour]

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thanks!

On Tue, Jan 10, 2017 at 4:30 AM, Anthony Heading <ajrh@ajrh.net> wrote:

> On Mon, Jan 09, 2017 at 03:55:08PM -0800, Timothee Cour wrote:
> > is there an option to show file:line everytime echo is called? eg:
> > echo myvr=$myvar #assuming this is at line 19
> > #shows:
> > /home/timothee/.zshrc:19 myvar=FOO
>
> Maybe use an alias?
>
> #!/bin/env zsh
> alias echo='echo ${0:A}:$LINENO'
>
> myvar=FOO
>
> echo myvr=$myvar #this seems actually to be line 6
>
>
> prints
>
> /home/ajrh/x:6 myvr=FOO
>

Re: option to show file:line everytime echo is called?

[Ray Andrews]

On 10/01/17 04:30 AM, Anthony Heading wrote:
>
> Maybe use an alias?
>
> #!/bin/env zsh
> alias echo='echo ${0:A}:$LINENO'
Where can I read up on " ${0:A} ", I haven't seen that construction before.
And probably there's a host of siblings equally useful.

Re: option to show file:line everytime echo is called?

[Daniel Shahaf]

Ray Andrews wrote on Tue, Jan 10, 2017 at 09:12:37 -0800:
> On 10/01/17 04:30 AM, Anthony Heading wrote:
> >
> >Maybe use an alias?
> >
> >#!/bin/env zsh
> >alias echo='echo ${0:A}:$LINENO'
> Where can I read up on " ${0:A} ", I haven't seen that construction before.
> And probably there's a host of siblings equally useful.

That's the `:A' modifier applied to the `$0' variable.

:A is in http://zsh.sourceforge.net/Doc/Release/Expansion.html#Modifiers

$0 is in http://zsh.sourceforge.net/Doc/Release/Parameters.html#Parameters-Set-By-The-Shell

Re: option to show file:line everytime echo is called?

[Timothee Cour]

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actually this doesn't work:

path/.zshrc:
```
alias echo2='echo ${0:A}:$LINENO'
echo2 FOO
fun(){
  echo2 BAR
}
fun
```

shows:
path/.zshrc:2 FOO #OK
$PWD/fun:1 BAR #NOT OK, I want path/.zshrc:4

On Tue, Jan 10, 2017 at 10:17 AM, Daniel Shahaf <d.s@daniel.shahaf.name>
wrote:

> Ray Andrews wrote on Tue, Jan 10, 2017 at 09:12:37 -0800:
> > On 10/01/17 04:30 AM, Anthony Heading wrote:
> > >
> > >Maybe use an alias?
> > >
> > >#!/bin/env zsh
> > >alias echo='echo ${0:A}:$LINENO'
> > Where can I read up on " ${0:A} ", I haven't seen that construction
> before.
> > And probably there's a host of siblings equally useful.
>
> That's the `:A' modifier applied to the `$0' variable.
>
> :A is in http://zsh.sourceforge.net/Doc/Release/Expansion.html#Modifiers
>
> $0 is in http://zsh.sourceforge.net/Doc/Release/Parameters.html#
> Parameters-Set-By-The-Shell
>

Re: option to show file:line everytime echo is called?

[Anthony Heading]

On Wed, Jan 11, 2017 at 06:25:30PM -0800, Timothee Cour wrote:
> actually this doesn't work:
> $PWD/fun:1 BAR #NOT OK, I want path/.zshrc:4

OK, so maybe this then:

alias echo2='echo ${(%):-%x:%I}'

Re: option to show file:line everytime echo is called?

[Daniel Shahaf]

Timothee Cour wrote on Tue, Jan 10, 2017 at 03:22:00 -0800:
> Thanks; `set -x` is rather verbose, is there any other way to just alter
> echo to show file:line (or similar) ?

% echo() { set -x; builtin echo "$@" }
% setopt promptsubst
% PS4='$functrace> ' 
% source =(<<<$'print foo\nf(){\necho bar\n}\nf\n')
foo
f:1 /tmp/zshqKiKeo:5 zsh:9> echo bar
bar

See zshmodules(1) for $functrace.

Cheers,

Daniel

Re: option to show file:line everytime echo is called?

[Bart Schaefer]

On Fri, 13 Jan 2017, Daniel Shahaf wrote:

> % echo() { set -x; builtin echo "$@" }

That's more output than he wanted.

  echo() { print -n "$funcfiletrace> "; builtin echo "$@" }

is probably more like it.

Similarly

  typeset -AgH whence_my_alias
  alias() {
    emulate -L zsh
    local opts
    zparseopts -D -a opts L g m r s
    if [[ -z $opts[-m] && $1 = *=* ]] && whence_my_alias[${1%=*}]=$functrace
    builtin alias $opts $*
  }
  whence() {
    local whence="$(builtin whence "$@")"
    case "$whence" in
    (* is an alias for *)
       local from="${whence_my_alias[${whence%% *}]}"
       print -r -- "$whence" ${from:+from} "$from"
       ;;
    (*) print -r -- "$whence";;
    esac
  }

Some edge cases possibly not caught.

Re: option to show file:line everytime echo is called?

[Bart Schaefer]

On Thu, 12 Jan 2017, Bart Schaefer wrote:

>     case "$whence" in
>     (* is an alias for *)
>
> Some edge cases possibly not caught.

Change that to (* is * alias for *) ...

Re: option to show file:line everytime echo is called?

[Timothee Cour]

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turns out Anthony Heading's solution works great (thanks!)
```
alias echo2='echo ${(%):-%x:%I}'
```

any downside compared to Daniel Shahaf's solution i haven't seen yet?

On Fri, Jan 13, 2017 at 12:06 AM, Bart Schaefer <schaefer@brasslantern.com>
wrote:

> On Thu, 12 Jan 2017, Bart Schaefer wrote:
>
> >     case "$whence" in
> >     (* is an alias for *)
> >
> > Some edge cases possibly not caught.
>
> Change that to (* is * alias for *) ...
>

Re: option to show file:line everytime echo is called?

[Timothee Cour]

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turns out Anthony Heading's solution works great (thanks!): alias
echo2='echo ${(%):-%x:%I}'

any downside compared to Daniel Shahaf's solution i haven't seen yet?


On Fri, Jan 13, 2017 at 12:06 AM, Bart Schaefer <schaefer@brasslantern.com>
wrote:

> On Thu, 12 Jan 2017, Bart Schaefer wrote:
>
> >     case "$whence" in
> >     (* is an alias for *)
> >
> > Some edge cases possibly not caught.
>
> Change that to (* is * alias for *) ...
>

Re: option to show file:line everytime echo is called?

[Daniel Shahaf]

Bart Schaefer wrote on Thu, Jan 12, 2017 at 23:57:49 -0800:
>   alias() {
>     if [[ -z $opts[-m] && $1 = *=* ]] && whence_my_alias[${1%=*}]=$functrace

[${1%%=*}]

> Some edge cases possibly not caught.

'alias' can take more than one positional argument.

Re: option to show file:line everytime echo is called?

[Ray Andrews]

On 13/01/17 12:32 AM, Timothee Cour wrote:
> turns out Anthony Heading's solution works great (thanks!): alias
> echo2='echo ${(%):-%x:%I}'
I have a function 'varis' that does something similar but it uses 
$LINENO which reports the line number within the function, but I see 
that the above reports the line number within the file which is very 
nice for the obvious reason that if you have several functions defined 
in one file, you don't constantly have to do the arithmetic of the line 
offset from where the function begins in the file.  But I'm curious as 
to how the  above can work, or even how $LINENO works, since, once a 
function is sourced, it exists in it's -- don' t know the correct term 
-- 'cut down' or 'pure' form with no blank lines or comments (I think), 
so how does zsh know/remember what the function looks like in the 
original file?  Does it go back and check when the above is used or does 
it have some way of remembering? That doesn't seem reasonable, still it 
works perfectly.

Way down in some file:

    xx ()
    {

         jjunk="This is jjunk"



         varis jjunk
         echo ${(%):-%x:%I}

    }

    $ xx
    xx, line 7:  evaluated: "$jjunk" is: |This is jjunk|
    ./varis:91


... so the 'echo' knows the true line number and the name of the file 
vs. knowing the name of the function and the line within the function.  
Nice to have both available!

Re: option to show file:line everytime echo is called?

[Bart Schaefer]

On Fri, 13 Jan 2017, Timothee Cour wrote:

> turns out Anthony Heading's solution works great (thanks!): alias
> echo2='echo ${(%):-%x:%I}'
>
> any downside compared to Daniel Shahaf's solution i haven't seen yet?

Use of $funcfiletrace (like in my follow-up to Daniel) will show you
not just the file:line where the echo was called, but also the file:line
where the caller of echo was called, and so on all the way up to the
top-level execution loop e.g. the interactive command line.