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On an interactive shell in emacs or vi, type a command with a $'…'
quoted string that contains a backslash-escaped single quote, like:
$ true $'foo\'bar' ▁
Then begin to type the name of a file present in the current
working directory and press tab. Nothing happens as completion
fails to work.
The completion code does not recognise $'…' strings. Instead, it
parses them as '…' strings in which there are no backslash escapes,
so it considers the last ' to open a second quoted string which is
not terminated.
Plus, when replacing a $'…' string with a (backslash-escaped)
completed string, the initial '$' is not replaced:
$ $'/etc/hosts<Tab>
$ $/etc/hosts
src/cmd/ksh93/edit/completion.c:
- find_begin():
- Learn how to recognise $'…' strings. A new local dollarquote
flag variable is used to distinguish them from regular '…'
strings. The difference is that backslash escapes (and only
those) should be recognised as in "…".
- Set a special type -1 for $'…' as the caller will need a way
to distinguish those from '…'.
- ed_expand(): When replacing a quoted string, remove an extra
initial character (being the $ in $') if the type set by
find_begin() is -1.
Resolves: https://github.com/ksh93/ksh/issues/462
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