Thread from comp.lang.tcl (5 replies)

How compatible is tcllib 1.21 with tcl9.0b3?

I've built tcl-9.0b3 and want to see how it plays with my scripts. (OK, 
more properly that should be "how my scripts play with tcl 9.0b3.)

I'm testing with a script that includes [package require uri].

This fails, saying it can't find the package.

I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 
starts with a fast return if

[package vsatisfies [package provide Tcl] 8]

returns 0.

I've changed that to

[package vsatisfies [package provide Tcl] 8 9]

and it now gets a couple of lines further down the script where it 
encounters

if {(0 == [catch {
     package vcompare [info patchlevel] [info patchlevel]
}]) && (
     [package vcompare [info patchlevel] 8.3.1] >= 0
)} {return}

and returns.

I don't understand this line well enough to change it. As far as I can 
make out,

     package vcompare [info patchlevel] [info patchlevel]

will always return 0 and won't throw an exception, so this should always 
result in a premature return, before all the

package ifneeded

commands for the packages withing tcllib are executed.

However, that argument applies equally to tcl8.6.14, but the same 
pkgIndex.tcl works just fine on my home-built copy of that.

It's getting late and I'll have another look tomorrow and see if I can 
work out what's happening. In the mean time, I'd very much appreciate 
any help you can provide.

On 14/09/2024 00:13, Alan Grunwald wrote:
> How compatible is tcllib 1.21 with tcl9.0b3?
> 
> I've built tcl-9.0b3 and want to see how it plays with my scripts. (OK, 
> more properly that should be "how my scripts play with tcl 9.0b3.)
> 
> I'm testing with a script that includes [package require uri].
> 
> This fails, saying it can't find the package.
> 
> I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 
> starts with a fast return if
> 
> [package vsatisfies [package provide Tcl] 8]
> 
> returns 0.
> 
> I've changed that to
> 
> [package vsatisfies [package provide Tcl] 8 9]
> 
> and it now gets a couple of lines further down the script where it 
> encounters
> 
> if {(0 == [catch {
>      package vcompare [info patchlevel] [info patchlevel]
> }]) && (
>      [package vcompare [info patchlevel] 8.3.1] >= 0
> )} {return}
> 
> and returns.
> 
> I don't understand this line well enough to change it. As far as I can 
> make out,
> 
>      package vcompare [info patchlevel] [info patchlevel]
> 
> will always return 0 and won't throw an exception, so this should always 
> result in a premature return, before all the
> 
> package ifneeded
> 
> commands for the packages withing tcllib are executed.
> 
> However, that argument applies equally to tcl8.6.14, but the same 
> pkgIndex.tcl works just fine on my home-built copy of that.
> 
> It's getting late and I'll have another look tomorrow and see if I can 
> work out what's happening. In the mean time, I'd very much appreciate 
> any help you can provide.

OK. I've had another look.

Between the line

     if {[package vsatisfies [package provide Tcl] 8]} {return}

which I have changed to ...vstaisfies... 8 9, and the multi-line command 
that I quoted above, are the lines

     # For Tcl 8.3.1 and later, that's all we need
     if {[package vsatisfies [package provide Tcl] 8.4]} {return}

I have confirmed that on Tcl 8.6.14, the return is executed, so I have 
changed the second line to

     if {[package vsatisfies [package provide Tcl] 8.4 9]} {return}

and the return is now executed on Tcl9.0b3. However,

     package require uri

still fails with "can't find package uri"

As far as I can make out, this means that the package should be fund 
using the [package unknown] mechanism.

In both version of Tcl, [package unknown] returns

     {::tcl::tm::UnknownHandler ::tclPkgUnknown}

I assume that since uri should be provided as a good old-fashioned 
package rather than a module, I can ignore ::tcl::tm::UnknownHandler.

::tclPkgUnknown appears to be unchanged between 8.6.14 and 9.0b3, apart 
from a change in 9.0b3 to use the (undocumented) flag -nopkg when 
executing [source] in a safe interpreter. Since my interpreter isn't 
safe, I think that's irrelevant.

I'm going to try to get my head around ::tclPkgUnknown to try to track 
down what has changed.

As before, any assistance would be very welcome.

Am 14.09.2024 um 01:13 schrieb Alan Grunwald:
> How compatible is tcllib 1.21 with tcl9.0b3?
> 
> I've built tcl-9.0b3 and want to see how it plays with my scripts. (OK, more properly that should be "how my scripts play with tcl 9.0b3.)
> 
> I'm testing with a script that includes [package require uri].
> 
> This fails, saying it can't find the package.
> 
> I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 starts with a fast return if
> 
> [package vsatisfies [package provide Tcl] 8]
> 
> returns 0.
> 
> I've changed that to
> 
> [package vsatisfies [package provide Tcl] 8 9]
> 
> and it now gets a couple of lines further down the script where it encounters
> 
> if {(0 == [catch {
>      package vcompare [info patchlevel] [info patchlevel]
> }]) && (
>      [package vcompare [info patchlevel] 8.3.1] >= 0
> )} {return}
> 
> and returns.
> 
> I don't understand this line well enough to change it. As far as I can make out,
> 
>      package vcompare [info patchlevel] [info patchlevel]
> 
> will always return 0 and won't throw an exception, so this should always result in a premature return, before all the
> 
> package ifneeded
> 
> commands for the packages withing tcllib are executed.
> 
> However, that argument applies equally to tcl8.6.14, but the same pkgIndex.tcl works just fine on my home-built copy of that.
> 
> It's getting late and I'll have another look tomorrow and see if I can work out what's happening. In the mean time, I'd very much appreciate any help you can provide.


Hi Alan,

tcllib 1.21 is not Tcl9 ready.
You should try the current trunk of tcllib.
Andreas Kupries committed some more Tcl9 related changes just yesterday.

Also note, that there is a RC0 candidate of Tcl9 (https://sourceforge.net/projects/tcl/files/Tcl/9.0.0/)

Paul

On 14/09/2024 16:37, Alan Grunwald wrote:
> On 14/09/2024 00:13, Alan Grunwald wrote:
>> How compatible is tcllib 1.21 with tcl9.0b3?
>>
>> I've built tcl-9.0b3 and want to see how it plays with my scripts. 
>> (OK, more properly that should be "how my scripts play with tcl 9.0b3.)
>>
>> I'm testing with a script that includes [package require uri].
>>
>> This fails, saying it can't find the package.
>>
>> I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 
>> starts with a fast return if
>>
>> [package vsatisfies [package provide Tcl] 8]
>>
>> returns 0.
>>
>> I've changed that to
>>
>> [package vsatisfies [package provide Tcl] 8 9]
>>
>> and it now gets a couple of lines further down the script where it 
>> encounters
>>
>> if {(0 == [catch {
>>      package vcompare [info patchlevel] [info patchlevel]
>> }]) && (
>>      [package vcompare [info patchlevel] 8.3.1] >= 0
>> )} {return}
>>
>> and returns.
>>
>> I don't understand this line well enough to change it. As far as I can 
>> make out,
>>
>>      package vcompare [info patchlevel] [info patchlevel]
>>
>> will always return 0 and won't throw an exception, so this should 
>> always result in a premature return, before all the
>>
>> package ifneeded
>>
>> commands for the packages withing tcllib are executed.
>>
>> However, that argument applies equally to tcl8.6.14, but the same 
>> pkgIndex.tcl works just fine on my home-built copy of that.
>>
>> It's getting late and I'll have another look tomorrow and see if I can 
>> work out what's happening. In the mean time, I'd very much appreciate 
>> any help you can provide.
> 
> OK. I've had another look.
> 
> Between the line
> 
>      if {[package vsatisfies [package provide Tcl] 8]} {return}
> 
> which I have changed to ...vstaisfies... 8 9, and the multi-line command 
> that I quoted above, are the lines
> 
>      # For Tcl 8.3.1 and later, that's all we need
>      if {[package vsatisfies [package provide Tcl] 8.4]} {return}
> 
> I have confirmed that on Tcl 8.6.14, the return is executed, so I have 
> changed the second line to
> 
>      if {[package vsatisfies [package provide Tcl] 8.4 9]} {return}
> 
> and the return is now executed on Tcl9.0b3. However,
> 
>      package require uri
> 
> still fails with "can't find package uri"
> 
> As far as I can make out, this means that the package should be fund 
> using the [package unknown] mechanism.
> 
> In both version of Tcl, [package unknown] returns
> 
>      {::tcl::tm::UnknownHandler ::tclPkgUnknown}
> 
> I assume that since uri should be provided as a good old-fashioned 
> package rather than a module, I can ignore ::tcl::tm::UnknownHandler.
> 
> ::tclPkgUnknown appears to be unchanged between 8.6.14 and 9.0b3, apart 
> from a change in 9.0b3 to use the (undocumented) flag -nopkg when 
> executing [source] in a safe interpreter. Since my interpreter isn't 
> safe, I think that's irrelevant.
> 
> I'm going to try to get my head around ::tclPkgUnknown to try to track 
> down what has changed.
> 
> As before, any assistance would be very welcome.
Hey ho.

I had a look on the wiki and found 
https://wiki.tcl-lang.org/page/Porting+extensions+to+Tcl+9#40a2085371b8effbae526101c0fd639a2ed6604c16513802a0e05bd3d9b8e1b0 
which includes a table listing packages that have been ported. The table 
includes tcllib 2.0 pointing to 
https://www.tcl3d.org/bawt/download/InputLibs/tcllib-2.0.7z

I've added tcllib 2.0 to my tcl9.0b3 installation and it passes my crude 
test, i.e.

     package require uri

completes successfully.

Thanks to anyone who has been reading.

On 14/09/2024 16:57, Paul Obermeier wrote:
> Am 14.09.2024 um 01:13 schrieb Alan Grunwald:
>> How compatible is tcllib 1.21 with tcl9.0b3?
>>
>> I've built tcl-9.0b3 and want to see how it plays with my scripts. 
>> (OK, more properly that should be "how my scripts play with tcl 9.0b3.)
>>
>> I'm testing with a script that includes [package require uri].
>>
>> This fails, saying it can't find the package.
>>
>> I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 
>> starts with a fast return if
>>
>> [package vsatisfies [package provide Tcl] 8]
>>
>> returns 0.
>>
>> I've changed that to
>>
>> [package vsatisfies [package provide Tcl] 8 9]
>>
>> and it now gets a couple of lines further down the script where it 
>> encounters
>>
>> if {(0 == [catch {
>>      package vcompare [info patchlevel] [info patchlevel]
>> }]) && (
>>      [package vcompare [info patchlevel] 8.3.1] >= 0
>> )} {return}
>>
>> and returns.
>>
>> I don't understand this line well enough to change it. As far as I can 
>> make out,
>>
>>      package vcompare [info patchlevel] [info patchlevel]
>>
>> will always return 0 and won't throw an exception, so this should 
>> always result in a premature return, before all the
>>
>> package ifneeded
>>
>> commands for the packages withing tcllib are executed.
>>
>> However, that argument applies equally to tcl8.6.14, but the same 
>> pkgIndex.tcl works just fine on my home-built copy of that.
>>
>> It's getting late and I'll have another look tomorrow and see if I can 
>> work out what's happening. In the mean time, I'd very much appreciate 
>> any help you can provide.
> 
> 
> Hi Alan,
> 
> tcllib 1.21 is not Tcl9 ready.
> You should try the current trunk of tcllib.
> Andreas Kupries committed some more Tcl9 related changes just yesterday.
> 
> Also note, that there is a RC0 candidate of Tcl9 
> (https://sourceforge.net/projects/tcl/files/Tcl/9.0.0/)
> 
> Paul
> 
> 
Thanks Paul - I've just spotted a reference to tcllib 2.0 on the wiki; 
see a message in a sibling thread.

I think I'll press on with 9.0b3 and hope to get that going happily just 
before 9.0 hits the streets :-). Where is the tcllib repo?

Alan

Am 14.09.2024 um 18:46 schrieb Alan Grunwald:
> On 14/09/2024 16:57, Paul Obermeier wrote:
>> Am 14.09.2024 um 01:13 schrieb Alan Grunwald:
>>> How compatible is tcllib 1.21 with tcl9.0b3?
>>>
>>> I've built tcl-9.0b3 and want to see how it plays with my scripts. (OK, more properly that should be "how my scripts play with tcl 9.0b3.)
>>>
>>> I'm testing with a script that includes [package require uri].
>>>
>>> This fails, saying it can't find the package.
>>>
>>> I've dug around a bit and I see that the pkgIndex.tcl in tcllib-1.21 starts with a fast return if
>>>
>>> [package vsatisfies [package provide Tcl] 8]
>>>
>>> returns 0.
>>>
>>> I've changed that to
>>>
>>> [package vsatisfies [package provide Tcl] 8 9]
>>>
>>> and it now gets a couple of lines further down the script where it encounters
>>>
>>> if {(0 == [catch {
>>>      package vcompare [info patchlevel] [info patchlevel]
>>> }]) && (
>>>      [package vcompare [info patchlevel] 8.3.1] >= 0
>>> )} {return}
>>>
>>> and returns.
>>>
>>> I don't understand this line well enough to change it. As far as I can make out,
>>>
>>>      package vcompare [info patchlevel] [info patchlevel]
>>>
>>> will always return 0 and won't throw an exception, so this should always result in a premature return, before all the
>>>
>>> package ifneeded
>>>
>>> commands for the packages withing tcllib are executed.
>>>
>>> However, that argument applies equally to tcl8.6.14, but the same pkgIndex.tcl works just fine on my home-built copy of that.
>>>
>>> It's getting late and I'll have another look tomorrow and see if I can work out what's happening. In the mean time, I'd very much appreciate any help you can provide.
>>
>>
>> Hi Alan,
>>
>> tcllib 1.21 is not Tcl9 ready.
>> You should try the current trunk of tcllib.
>> Andreas Kupries committed some more Tcl9 related changes just yesterday.
>>
>> Also note, that there is a RC0 candidate of Tcl9 (https://sourceforge.net/projects/tcl/files/Tcl/9.0.0/)
>>
>> Paul
>>
>>
> Thanks Paul - I've just spotted a reference to tcllib 2.0 on the wiki; see a message in a sibling thread.
> 
> I think I'll press on with 9.0b3 and hope to get that going happily just before 9.0 hits the streets :-). Where is the tcllib repo?

It's here: https://core.tcl-lang.org/tcllib/doc/trunk/embedded/index.md

> Alan