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Change the shell's line buffer mechanism to more
closely match readline-based shells. New behavior:
1. Blank lines are not added to the line buffer.
2. Pressing the down arrow on the last line causes no change.
The previous behavior erased the line.
3. The new line is temporarily added to the line buffer
so the user can move to previous lines with up arrows
and then back to the new line with down arrows.
The previous behavior discarded the partially written
new line.
4. Changes made to previous lines while exploring the line
buffer history are preserved.
The previous behavior discarded changes made to older lines.
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Hans Bolinder (the author/maintainer of qlc) prefers
for readability reasons to use length/1 in a guard
when it is known that the list is guaranteed to be
short, so the change suggested by tidier for line 875
of qlc_pt has not been included.
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* uw/shell-tab-completion:
Shell tab completion now works for quoted module and function names
OTP-8383 Shell tab completion now works for quoted module and function
names. (Thanks to Ulf Wiger.)
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While quoted atoms in module and function names are not common,
they are allowed, and sometimes quite useful. In OTP, they are
commonplace in ORBER, and can also be found in XMERL. Tab completion
needs to recognize quoted atoms and act accordingly. This patch
includes changes in edlin:over_word/1. It should be noted that these
changes also affect the 'kill word', 'forward word' and 'backward word'
commands in the line editor. The author thinks that the changes are
for the better. There are also minor changes in edlin_expand.erl -
mainly in regard to the conversion between atoms and strings.
Another change is that the list of matches is now sorted, partly
to simplify testing, but also because it seems sensible to present
the matches that way. A test suite, edlin_expand_SUITE, has been
added to the stdlib test suites.
(amended 2009-12-18 to actually include the modified files too
and again to rename the capitalized test modules for portability.)
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