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Comment:More formatting tweaking
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SHA3-256: 072c7a281d3e418504a7aba1b757e4e6008d31c407ff35bb42c41075bf1a35c1
User & Date: dkf 2018-03-08 14:24:38.073
Context
2018-03-09
10:05
tip490 oo for msgcat: re-changed "option" to "extension" check-in: 016afc2026 user: oehhar tags: trunk
2018-03-08
14:24
More formatting tweaking check-in: 072c7a281d user: dkf tags: trunk
14:19
Split out the discussion. check-in: 0b38fa0683 user: dkf tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
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<td valign='top'># TIP 491: Threading Support: phasing out non-threaded builds</td>
</tr>
<tr class='invote'>
<td valign='top'><a href='./tip/490.md'>490</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Voting</td>
<td valign='top'># TIP 490: msgcat for tcloo</td>
</tr>
<tr class='project projectfinal projectfinal87 project87'>
<td valign='top'><a href='./tip/489.md'>489</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Final</td>
<td valign='top'># TIP 489: Add image widget command to the Tk canvas</td>








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<td valign='top'># TIP 491: Threading Support: phasing out non-threaded builds</td>
</tr>
<tr class='invote'>
<td valign='top'><a href='./tip/490.md'>490</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Voting</td>
<td valign='top'># TIP 490: msgcat for TclOO</td>
</tr>
<tr class='project projectfinal projectfinal87 project87'>
<td valign='top'><a href='./tip/489.md'>489</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Final</td>
<td valign='top'># TIP 489: Add image widget command to the Tk canvas</td>
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# TIP 490: msgcat for tcloo
	Author:         Harald Oehlmann <[email protected]>
	State:          Voting
	Type:           Project
	Vote:           In progress
	Created:        07-Dec-2017
	Post-History:
	Keywords:       msgcat, oo

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# TIP 490: msgcat for TclOO
	Author:         Harald Oehlmann <[email protected]>
	State:          Voting
	Type:           Project
	Vote:           In progress
	Created:        07-Dec-2017
	Post-History:
	Keywords:       msgcat, oo
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    set message [namespace eval $messagenamespace [list ::msgcat::mc $message]]
    ...
}
</pre>

Examples with the 4 use-cases:

### Use-case 1: the package does not use OO

<pre>
namespace eval ::N1 {
    proc m1 {} {msgcat::mcpackagenamespaceget}
}

% N1::m1
-> ::N1
</pre>

### Use-case 2: call within class definition script

<pre>
% namespace eval ::N2Class {
    oo::class create C1 {puts "pns=[msgcat::mcpackagenamespaceget]"}
}
-> pns=::N2Class
-> ::N2Class::C1
</pre>

### Use-case 3: The package implementation is done by a class

<pre>
namespace eval ::N3Class {
    oo::class create C1
    oo::define C1 method m1 {msgcat::mcpackagenamespaceget}
}

# The class object may be used in another namespace

namespace eval ::N3Obj {
    set O1 [::N3Class::C1 new]
}

% $N3Obj::O1 m1
-> ::N3Class
</pre>

### Use-case 4: The package implementation is done by a classless object

<pre>
namespace eval ::N4 {
    oo::object create O1
    oo::objdefine O1 method m1 {} {msgcat::mcpackagenamespaceget}
}

% N4::O1 m1
-> ::N4
</pre>

### Manually overwrite the package namespace by namespace eval

As stated in the introduction, current oo code might have used an explicit `namespace eval packagenamespace` to make msgcat work. This should still be supported:

<pre>
namespace eval ::N4 {
    oo::object create O1
    oo::objdefine O1 method m1 {} {
        namespace eval ::N5 { msgcat::mcpackagenamespaceget}
    }








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    set message [namespace eval $messagenamespace [list ::msgcat::mc $message]]
    ...
}
</pre>

Examples with the 4 use-cases:

1. First use case: the package does not use OO

	<pre>
	namespace eval ::N1 {
	    proc m1 {} {msgcat::mcpackagenamespaceget}
	}

	% N1::m1
	-> ::N1
	</pre>

2. Second use case: call within class definition script

	<pre>
	% namespace eval ::N2Class {
	    oo::class create C1 {puts "pns=[msgcat::mcpackagenamespaceget]"}
	}
	-> pns=::N2Class
	-> ::N2Class::C1
	</pre>

3. Third use case: The package implementation is done by a class

	<pre>
	namespace eval ::N3Class {
	    oo::class create C1
	    oo::define C1 method m1 {msgcat::mcpackagenamespaceget}
	}

	# The class object may be used in another namespace

	namespace eval ::N3Obj {
	    set O1 [::N3Class::C1 new]
	}

	% $N3Obj::O1 m1
	-> ::N3Class
	</pre>

4. Fourth use case: The package implementation is done by a classless object

	<pre>
	namespace eval ::N4 {
	    oo::object create O1
	    oo::objdefine O1 method m1 {} {msgcat::mcpackagenamespaceget}
	}

	% N4::O1 m1
	-> ::N4
	</pre>

### Manually overwriting the package namespace by namespace eval

As stated in the introduction, current OO code might have used an explicit `namespace eval packagenamespace` to make msgcat work. This should still be supported:

<pre>
namespace eval ::N4 {
    oo::object create O1
    oo::objdefine O1 method m1 {} {
        namespace eval ::N5 { msgcat::mcpackagenamespaceget}
    }
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