Trying to make a programming font with Ligatures and not sure where I’m going wrong

1

A number of new programming fonts use ligatures in a unique way to make coding easier.

typing ← will turn into ←
typing =/= will turn into ≠
typing >= will turn into ⩾

But it doesn’t change the character typed (which is very important in programming) just the way the font displays the character. Some more:

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Anyway, I was trying to edit Courier New (the font i use for programming) to add these programming ligatures, but I don’t know where I’m going wrong.

Here’s a quick video of what I did so maybe people can see what I’m doing incorrectly:

For this ligature, I’m trying to get ← to display as ←

I know the end is the problematic part, but I can’t find good instruction on what to put in my code

2

OpenType features never change the character stream. Only the glyphs that are displayed. That is the whole point of OT features.

You added a lookup (why?) but as far as I can see, you did not add the lookup to a feature, so it will never be triggered.

How about you call the ligature less_hyphen (yes, hyphen, because I don’t think you can type an actual minus on the Mac and PC keyboards), and let the features be autogenerated. Read more about generating ligatures in this tutorial:

Also, you are working on a reverse-engineered font. After checking the legalese, there are a few technical things to consider. Please read these if you have not already: