Hi, I use a TCL project with multiple files involved and *proc* multiple times defined with the same name.
the reason is to have a "generic" definition of a *proc* and sometimes I need a more specific definition
who overwrites the generic definition.

For debugging it would be very useful if I have something like `info proc-attribute *procname*`
which return the *file* and/or the *line* where the *proc* was defined.

The implementation is probably simple because this details are know at the time a *proc* defined.

To make the interface more command it could look like:

info proc args "procname" → return the arguments
info proc body "procname" → return the body
info proc file "procname" → return the definition file
info proc line "procname" → return the definition line in file

the proc-attribute feature could also be used to add additional features to a *proc* like *non-overwrite* etc

mfg AO

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On 3/25/23 04:41, aotto1968 wrote:

Hi, I use a TCL project with multiple files involved and *proc* multiple times defined with the same name.
the reason is to have a "generic" definition of a *proc* and sometimes I
need a more specific definition
who overwrites the generic definition.

For debugging it would be very useful if I have something like `info proc-attribute *procname*`
which return the *file* and/or the *line* where the *proc* was defined.

The implementation is probably simple because this details are know at
the time a *proc* defined.

To make the interface more command it could look like:

info proc args "procname"    → return the arguments
info proc body "procname"    → return the body
info proc file "procname"    → return the definition file
info proc line "procname"    → return the definition line in file

the proc-attribute feature could also be used to add additional features
to a *proc* like *non-overwrite* etc

mfg AO

Please make a TIP of this and submit a proposed implementation.

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On 3/25/2023 2:41 AM, aotto1968 wrote:

Hi, I use a TCL project with multiple files involved and *proc* multiple times defined with the same name.
the reason is to have a "generic" definition of a *proc* and sometimes I need a more specific definition
who overwrites the generic definition.

For debugging it would be very useful if I have something like `info proc-attribute *procname*`
which return the *file* and/or the *line* where the *proc* was defined.

The implementation is probably simple because this details are know at the time a *proc* defined.

To make the interface more command it could look like:

info proc args "procname"    → return the arguments
info proc body "procname"    → return the body
info proc file "procname"    → return the definition file
info proc line "procname"    → return the definition line in file

the proc-attribute feature could also be used to add additional features to a *proc* like *non-overwrite* etc

mfg AO

I'm not certain, but you may be able to use [info
frame] for this along with a [trace] and/or [rename]
of [proc]. I've used info frame in a debugging tool to
get line and file info. Also, an error has this info,
but I don't know how it gets it.

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On Sat, 25 Mar 2023 10:41:24 +0100, aotto1968 wrote:

Hi, I use a TCL project with multiple files involved and *proc* multiple times defined with the same name. the reason is to have a "generic" definition of a *proc* and sometimes I need a more specific definition
who overwrites the generic definition.

For debugging it would be very useful if I have something like `info proc-attribute *procname*` which return the *file* and/or the *line*
where the *proc* was defined.

The implementation is probably simple because this details are know at
the time a *proc* defined.

To make the interface more command it could look like:

info proc args "procname" → return the arguments
info proc body "procname" → return the body
info proc file "procname" → return the definition file
info proc line "procname" → return the definition line in file

the proc-attribute feature could also be used to add additional features
to a *proc* like *non-overwrite* etc

mfg AO

I don't know. Seems to me that you should rather go with two procs:

proc usual {args} {
do the usual
}

proc chameleon {args} {
some odd job
}


One has to wonder if you really need that much flexibility though. It's reasonable to guess that you probably deal with few enough situations
that you could have one proc (or switch clause inside one proc) for each particular case instead of rewriting procs on the fly. Do you even remember what those temporary procs do when you maintain your code?
And if you need to know *when* the proc was changed to use or manage it,
it sounds like you are skating on thin ice.

--
Luc

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On 25.03.23 20:02, Luc wrote:

I don't know. Seems to me that you should rather go with two procs:

proc usual {args} {
do the usual
}

proc chameleon {args} {
some odd job
}

One has to wonder if you really need that much flexibility though. It's reasonable to guess that you probably deal with few enough situations
that you could have one proc (or switch clause inside one proc) for each particular case instead of rewriting procs on the fly. Do you even remember what those temporary procs do when you maintain your code?
And if you need to know *when* the proc was changed to use or manage it,
it sounds like you are skating on thin ice.

Well, there is something like a "driver-proc" doing the controlling job and this "driver" is calling multiple "worker-proc(s)"
to do the job. if I change the name of the "worker-proc" the "driver-proc" have to be updated as well → this is not good.

mfg ao

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On Saturday, March 25, 2023 at 12:54:07 PM UTC-7, aotto1968 wrote:

On 25.03.23 20:02, Luc wrote:

I don't know. Seems to me that you should rather go with two procs:

proc usual {args} {
do the usual
}

proc chameleon {args} {
some odd job
}

One has to wonder if you really need that much flexibility though. It's reasonable to guess that you probably deal with few enough situations
that you could have one proc (or switch clause inside one proc) for each particular case instead of rewriting procs on the fly. Do you even remember
what those temporary procs do when you maintain your code?
And if you need to know *when* the proc was changed to use or manage it, it sounds like you are skating on thin ice.

Well, there is something like a "driver-proc" doing the controlling job and this "driver" is calling multiple "worker-proc(s)"
to do the job. if I change the name of the "worker-proc" the "driver-proc" have to be updated as well → this is not good.

mfg ao

When I write code that calls other procs that can be varied, I define the functions using variables, and the [apply] command to execute the functions. This way the proc(s) themselves can be passed to the "driver" by value. This still leaves you with
the problem of identifying the source origin, but you do have more control over tracking where stuff came from. (See the [apply] command for details.)

The "info proc" additions would still be a nice feature to have. Just know that there are cases where there isn't any identifiable file/line for a proc.

-Brian

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On 26.03.23 00:46, briang wrote:

On Saturday, March 25, 2023 at 12:54:07 PM UTC-7, aotto1968 wrote:

On 25.03.23 20:02, Luc wrote:

I don't know. Seems to me that you should rather go with two procs:

proc usual {args} {
do the usual
}

proc chameleon {args} {
some odd job
}


One has to wonder if you really need that much flexibility though. It's
reasonable to guess that you probably deal with few enough situations
that you could have one proc (or switch clause inside one proc) for each >>> particular case instead of rewriting procs on the fly. Do you even remember >>> what those temporary procs do when you maintain your code?
And if you need to know *when* the proc was changed to use or manage it, >>> it sounds like you are skating on thin ice.

Well, there is something like a "driver-proc" doing the controlling job and this "driver" is calling multiple "worker-proc(s)"
to do the job. if I change the name of the "worker-proc" the "driver-proc" have to be updated as well → this is not good.

mfg ao

When I write code that calls other procs that can be varied, I define the functions using variables, and the [apply] command to execute the functions. This way the proc(s) themselves can be passed to the "driver" by value. This still leaves you with

the problem of identifying the source origin, but you do have more control over tracking where stuff came from. (See the [apply] command for details.)

The "info proc" additions would still be a nice feature to have. Just know that there are cases where there isn't any identifiable file/line for a proc.

-Brian

I don't understand where is the advantage of overwrite and call a variable as lambda in difference of overwrite and call a proc.
With a proc you have still the possible (as mentioned up) to get extra attributes like source,line etc

-ao

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Hi, most of the stuff you require is available in the ‚info‘ command, the filename you can get on source. Of course only for a unique proc name.

I really have no clue what you try to accomplish, but a namespace would not help here?

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On 26.03.23 11:58, Mole Cool wrote:

Hi, most of the stuff you require is available in the ‚info‘ command, the filename you can get on source. Of course only for a unique proc name.

I really have no clue what you try to accomplish, but a namespace would not help here?

Hi,

the file filename a *proc* is defined is *not* the same a filename when *proc* is used.
the *info* command I get the the filename when *proc* is used,

-ao

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But if you rename ‚source‘ you can have a pre and post command to see which procs a new and defined in the file, and the last one is the active one. Again, a renamed proc which will jump in the required namespace would for me the best. But you know
the details 😉

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Mole Cool <[email protected]> wrote:

I really have no clue what you try to accomplish, but a namespace
would not help here?

I am also quite confused as to what the OP is trying to accomplish.

As best I understand from the vague descriptions given so far, it seems
that the OP has an initial 'proc', say 'caller' which calls a second
('worker') to perform some task.

I.e.:

proc caller {arg1 arg2} {
set result [worker $arg2]
...
}

And the OP wants to swap out different 'workers' for some reason such
that which worker is actually called differs based on some condition.

So they have something like this:

proc swap_worker {arg} {
switch -exact -- $arg {
worker-1 {
proc worker {arg} {
...
}
}
worker-2 {
proc worker {arg} {
... (different body from worker-1)
}
}
}
}

And they call "swap_worker 0" and/or "swap_worker 1" as needed to
"change the definition of 'worker'. Although I suspect from other
vague descriptions by the op that my "proc worker" examples in the
switch above are actually "source worker-1.tcl" and "source
worker-2.tcl" instead.

So, if this is what they are trying to do (and I don't know that it is,
this is just what I've come up with by trying to "fill in the gaps"
left by OP's vague description) then namespaces might be a solution
to what they want that they have not tried yet.

Namespaces allow creation of 'ensemble' commands. And each 'ensemble'
itself has a "-map" which can optionally be setup to provide custom
mapping of externally visible names to internal destination names
within the ensemble.

So the OP could setup a namespace with two (or more) 'worker'
implementations inside. Then configure an ensemble to call one of the 'workers' (by appropriate -map setup). And later, when OP wants to
swap "worker" implementation without changing callers, OP simply
re-configures the -map for the ensemble to call the other worker inside
the namespace ensemble.

So OP's 'caller' would look like this:

proc caller {arg1 arg2} {
set result [my-project do-work $arg2]
...
}

Then, by adjustment of the -map configuration for the 'my-project'
ensemble, the 'do-work' sub-command can call either of
'my-project::worker-1' or 'my-project::worker-2' at different times.

Achieving the same results as "replacing" 'worker' with a new 'worker'
proc.

And, the OP can simply introspect the -map to see which internal proc
was being called at any given time. It is also possible that in the
case of errors (which IIRC seemed to be OP's initial ask) that Tcl
itself would report the actual used internal proc name for the
destination of the ensemble. And if not, OP would just need to [catch]
or [try] the call, then query the -map before outputting a custom error
message to report "which proc was used at the time of the call".

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