Programmer's
Editor 14.04
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Epsilon User's Manual and Reference > Variable Reference >
delete-hacking-tabs: preference buffer-specific variable
Default value: 0
If 1, when <Backspace> deletes a tab, it first turns the tab into
the number of spaces necessary to keep the cursor in the same column,
then deletes one of the spaces. If 2, when <Backspace> deletes a
space, it deletes additional spaces and tabs until it reaches the
previous tab column (set by soft-tab-size or tab-size). The
first setting makes <Backspace> treat tabs more like spaces; the
second makes it treats spaces more like tabs.
You can add these bit settings to get both behaviors. Other bits
restrict when deleting a space deletes additional spacing to reach a
tab column. The bit 4 does this only within a line's indentation
(in the run of whitespace at the start of a line).
The 8 bit deletes multiple spaces only when the deletion starts in
a tab column. So if tabs are every 4 columns and a line has 10 spaces,
pressing <Backspace> three times starting in column 10 will delete one
space, one space, then four spaces.
The 0x10 bit deletes multiple spaces only when in the middle of
spacing; there must be spaces or tabs both before and after point.
The <Backspace> key (or to be precise, the backward-delete-character command it runs by default) never deletes multiple spaces due to delete-hacking-tabs when given a numeric prefix argument.
Before backward-delete-character checks this variable, it looks
for a mode-specific one, a variable whose name consists of the current
mode name followed by -backward-delete-character. If found, it
uses that variable's value instead.
More info:
Inserting and Deleting
backward-delete-character
python-delete-hacking-tabs
Formatting Improvements in Epsilon 13 (Changes from Older Versions)
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Epsilon Programmer's Editor 14.04 manual. Copyright (C) 1984, 2021 by Lugaru Software Ltd. All rights reserved.