Dear all,

I'm trying to figure out how to check on a version of a library and to do an action on it from the startup-sequence i.e. dos script.

This is what I need (pseudo):

$ver = version >NIL: some.library
if $ver EQ "1.1"
   #execute program
endif
if $ver EQ "1.2"
   #execute program
endif
if $ver EQ "1.3"
   #execute program
endif

version >NIL: some.library version=1 revision=1
if not warn
   #execute program
else
   version >NIL: some.library version=1 revision=2
   if not warn
      #execute program
   else
      version >NIL: some.library version=1 revision=2
      if not warn
         #execute program
      endif
   endif
endif

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@sananaman

version >NIL: some.library version=1 revision=3
if not warn
  ; we have version 1.3 or newer
else
  version >NIL: some.library version=1 revision=2
  if not warn
    ; we have version 1.2
  else
    version >NIL: some.library version=1 revision=1
    if not warn
      ; we have version 1.1
    else
      ; we have a version older than 1.1
    endif
  endif
endif

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@salass00

That I tried that already myself and does not work 100% correct.

If let's say I test on version in the code:
- 1.4
- 1.0
- 0.9

But for some reason there is a 1.5 available it will be detected as 1.4.
Or when someone got a 1.3 it will be seen as 1.0.

The version command evaluates 'matching number OR higher'.

That is the whole problem where I bump into, I want to EXACTLY match the number (EQUALS).

Last edited by sananaman on 13-May-2012 at 12:15 PM.

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@sananaman

You just need more if statements:

version >NIL: some.library version=1 revision=5
if not warn
  ; we have version 1.5 or newer
else
  version >NIL: some.library version=1 revision=4
  if not warn
    ; we have version 1.4
  else
    version >NIL: some.library version=1 revision=1
    if not warn
      ; we have version 1.1, 1.2 or 1.3
    else
      version >NIL: some.library version=1 revision=0
      if not warn
        ; we have version 1.0
      else
        version >NIL: some.library version=0 revision=9
        if not warn
          ; we have version 0.9
        else
          ; we have version 0.8 or older
        endif
      endif
    endif
  endif
endif

@sananaman
Quote:

Note: Ideally it would be nice to capture the version number and put it in an variable and then evaluate the variable.

It is not too hard to do such things with ADOS batch using "backtick" and "cut".

eg,

setenv fullver `version file libs:reqtools.library`
setenv fullver `cut "$fullver" word=2`
setenv majorver `cut $fullver w=1 s=.`
setenv minorver `cut $fullver w=2 s=.`
echo $majorver
echo $minorver

Tom

Last edited by tbreeden on 13-May-2012 at 02:31 PM.

@sananaman

Don't know how you're testing this but it's worth noting that the version will by default first check for the library in memory before it will check for a file on disk, so if some program has the library loaded in memory and you test just by replacing the file in LIBS: then you might not get the result you expect.

In order to force "version" to get the version information from the file on disk you can use the "file" switch.

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@Gazelle

That's more or less what I suggested above but he claims that it doesn't work (it should work since it checks for higher version numbers first before lower ones unlike sananaman's version which checks them in the wrong order and doesn't work for obvious reasons).

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@sananaman
Quote:

There must be another better and more clean way..... anyone? Note: Ideally it would be nice to capture the version number and put it in an variable and then evaluate the variable.

If you want to match exact versions then your pseudo code is close. See if this works:

;AmigaDOS Script
Set library libs:some.library
If EXISTS $library
    Set version `Version *>NIL: file $library`
    If "$version" EQ "some.library 1.1"
        ; #execute program
        skip done
    Endif
    If "$version" EQ "some.library 1.2"
        ; #execute program
        skip done
    Endif
    If "$version" EQ "some.library 1.3"
        ; #execute program
        skip done
    Endif
    lab done
    Unset version
Endif
Unset library

Last edited by Xenic on 14-May-2012 at 07:52 PM.
Last edited by Xenic on 14-May-2012 at 12:39 AM.

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@tbreeden

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@All that helped:
Guys I really would like to thank you all for thinking about solutions the get a nice script.

My personal opinion is that Xenic got the most clean code solution.
Al the others are too much nesting of 'if then else' inside 'if then else'. It doesn't look clean and it's too easy to make a mistakes. But thanks for the thinking work anyway.

@Xenic:
On my system this part doesn't work:

Set version `Version *>NIL: file $library`
(This raises an error messge).

It needs to be:

Set version `Version file $library`

As the result (no matter what it will be) will be placed in the variable 'version' anyway.
I've also changed the 'version' variable in something else to avoid confusion.

And if you only want to evaluate on 'version number' instead of 'some.libary versionnumber' then you might want to use the trick of tbreeden.
Altough I've not tested this in real.

Thanks all....

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