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4.3 Alteration

The “alterations” system provides a Versor style interface to changing the text of the current Versor selection.

You can enter the alteration system by typing M-insert, and you can accept the current value by typing <insert> or <return>. You can abandon the alterations, leaving the text at its original value, by pressing <delete>.

While you are doing alterations, the <LEFT> and <RIGHT> cursor keys change the text within the selection, between several possible values of the same kind. The <UP> and <DOWN> cursor keys change which kind of thing you are choosing between.

The effect is similar to turning the selection into a little window behind which you are scrolling a two-dimensional grid of possible values.

For example, you could use the <LEFT> and <RIGHT> keys to put any local variable which is currently in scope into the selection, and <UP> and <DOWN> keys to switch between selecting local variables, global variables, and expressions wrapped around a variable.

When you have got the text you want into the selection, you can use a “select” key (either insert or return) to accept that selection, or a “reject” key (delete) to go back to the original value.

The types of value available depends on the context. Possible types include:

The data used by Versor's “alteration” feature is provided by the companion package, Languide (Language Guided Editing). See Alterations (Languide: Language-guided editing), for details.

“Alterations” grew from the same kind of idea as DoReMi.el (, which I may try to integrate with in future versions. Logo