Now the function utf8_next_char with an empty string returns NULL instead of
the next char, which is most of the time after an allocated buffer.
And the function utf8_char_size with an empty string now returns 0 instead of
1.
This indirectly fixes a buffer overflow in function eval_string_range_chars
when the input string is empty (for example when doing `/eval -n ${chars:}`).
This changes the commands delete_beginning_of_line, delete_end_of_line,
delete_line, move_beginning_of_line and move_end_of_line to operate on
the current line instead of the whole input. The commands
delete_beginning_of_input, delete_end_of_input, delete_input,
move_beginning_of_input and move_end_of_input are added with the
previous implementations that the line commands had.
Additionally, the commands move_previous_line and move_next_line are
added which moves the cursor to the previous/next line and keeps the
horizontal position in the line.
The meta-r key is changed from delete_line to delete_input to keep the
behavior, and because you probably want to delete the whole input more
often than the line. The meta-R key is added for delete_line.
The home, end, ctrl-u and ctrl-k keys are kept to the same commands,
which means that they change behaviour. This is because having them
operate on the line is consistent with other applications (vim, zsh),
and I also think it's more practical.
These new bindings are added:
shift-home: /input move_beginning_of_input
shift-end: /input move_end_of_input
shift-up: /input move_previous_line
shift-down: /input move_next_line
meta-R: /input delete_line
meta-ctrl-u: /input delete_beginning_of_input
meta-ctrl-k: /input delete_end_of_input
Relates to #1498
All lowercase letters are now properly converted to uppercase letters (and vice
versa), via functions `towupper` and `towlower`.
Functions `string_tolower`, `string_toupper` and `utf8_charcasecmp` have been
optimized to be faster when there are ASCII chars (< 128); functions are about
25-40% faster with mixed chars (both ASCII and multi-bytes).
Function `utf8_wide_char` has been removed, `utf8_char_int` can be used
instead.
Now the function utf8_char_size_screen can return -1 when the char is not
printable.
It has a specific behavior for some chars:
- U+0009: value of option weechat.look.tab_width
- U+0001 to U+001F (except U+0009): 1
- U+00AD (soft hyphen): -1
- U+200B (zero width space): -1
When there non printable chars, the return of the function was 1.
For example utf8_strlen_screen("abc\x01") now returns 4 instead of 1.
In addition the function has been optimized to not use the `mbstowcs` function
which is slow; result is up to 15% faster.
Tests for size on screen are made on U+2EE9 (CJK Radical Simplified Yellow)
instead of U+24B62 (CJK Unified Ideograph-24B62) which returns a length of 1 on
FreeBSD and 2 on Linux.
Sébastien Helleu