On 18. Jan 2021, at 10:19, Marcel Taeumel marcel.taeumel@hpi.de wrote:

Hi David.

...

I wonder whether it's possible to display the assignment operator '_' underscore as Left Arrow.

Well, the original font rendered the underscore character ("_") as a left arrow. One could still extend Shout to add a special text attribute to either "_" or ":=" to change to a font that has such a property. Maybe take a look at FormSetFont and the example in FormInspector >> #embedForm:inText:.

Of course, you could directly change the system's code font to one that renders all "_" as a left arrow, regardless of the context.

Note that it might be confusing for some users to see a left arrow as a single entity while actually having to type ":" and "=".

Also note that we removed all underscore assignments ("_") from Squeak's Trunk repository. For good. :-)

SyntaxHighlightingAsYouTypeLeftArrowAssignment _should_ work: " 'If true, and syntaxHighlightingAsYouType is enabled, all ANSI format assignments ( := ) will be converted to left arrows ( _ ) when a method is selected in a Browser. Whilst editing a method, this setting has no effect - both the left arrow and the ansi format may be used. "

If I enable it, I see _ instead of := in all methods, so it works fine.

Note that the fonts themselves support swapping _ and ^ for arrows.

Variant A: (destructive) See TextStyle>>#makeArrows Variant B: (semi-destructive) See StrikeFont>>#useLeftArrow and StrikeFont>>$#useUnderscore.

However, useLeftArrow is not completely right.

It should read:

useLeftArrow self characterToGlyphMap. characterToGlyphMap at: 96 put: 131. characterToGlyphMap at: 95 put: 130.

After that, If you do

``` Preferences enable: #syntaxHighlightingAsYouTypeLeftArrowAssignment. Preferences standardCodeFont useLeftArrow.

```

You'll see:

However, shout seems to do strange things there if #syntaxHighlightingAsYouTypeLeftArrowAssignment is on. It tries hard to show the "assignment" as _ no matter what.

That said, It is supposed to somewhat work :)

Best regards -Tobias

Best, Marcel

...

Am 16.01.2021 17:03:31 schrieb stes@PANDORA.BE stes@telenet.be:

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Hi,

Platform: squeak 4.19.5 with Squeak 4.6 or squeak 5.x with Squeak 6.0alpha

I wonder whether it's possible to display the assignment operator '_' underscore as Left Arrow.

"Cuis-Smalltalk" is doing this, looks very nice.

I've found something on wiki.squeak.org :

syntaxHighlightingAsYouTypeLeftArrowAssignment

in preferences.

Go to Menu -> Tools -> Preferences (or Menu -> Apps -> Preferences Browser)

Search : syntaxHighlightingAsYouType

(it's under "browsing')

enabled

syntaxHighlightingAsYouTypeLeftArrowAssignment

enabled

does not work : do I need "Shout"

http://wiki.squeak.org/squeak/5700

is Shout still working in 4.6 ?

I have the impression from the wiki.squeak.org page that there existed a package to display '_' as left-arrow but not sure whether it is still there.

David Stes

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Hi

On 18. Jan 2021, at 12:50, stes@PANDORA.BE stes@telenet.be wrote:

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Thanks for the feedback.

Sorry for asking, yes, it works, sorry for claiming that it did NOT work.

I think I just forgot to "Save" my preferences, I selected "enable" for those options and tried it in a Workspace and I think it didn't have any effect.

Because the feedback confirmed that the option *is* working, I tried again ...

And for some reason (maybe "Save" ?) it works now ...

I had noticed in Cuis-Smalltalk that they have this nice feature, and I wondered whether it also exists in Squeak.

So it does ... the feature 1) displays all assignments in Squeak code as left-arrows for me and 2) when I type in a Workspace it immediately displays an assignment as a left arrow.

I use a TrueType font that I have found on the net, which displays the underscore as a left-arrow.

I configured that font as my "code font" in the appearances menu.

As Tobias Pape points out special TrueType fonts are *not* required as Squeak has the machinery to swap the glyphs.

However there are a few fonts on the net that have old encodings for the glyphs for up-arrow and left-arrow.

However the solution that Tobias Pape mentions is better, as no special font, is then required.

Perhaps a small advantage of using a special font is that the special font, can also work in editors outside Squeak.

Maybe using ← and ↑ could simply be used directly?

-t