bind control-shift-u to unicode-input, move urls to o

Having a keybinding to invoke arbitrary unicode characters is very
useful. It's often used as a method of last resort to communicate with
people outside of your main language. For example, if you want to type
the last letter of my real name, you can invoke the latin-1 character
0xe9 or unicode 0x00e9.

You can also use this to type special characters, for example, unicode
U+1F4A9 is of course, the infamous PILE OF POO, which is sure to
produce million laughs everywhere you go.

In foot, there's no keybinding by default to invoke the very useful
unicode-input command. There is no "standard" (as in "ISO") keybinding
this either. But there *is* a de-facto standard currently deployed
by *both* GTK and Qt (a rare feat) *and* Chrome OS (an even rarer
feat) and it's control-shift-u.

Alternatives include Control-x 8 (emacs), Control V u (vim),
Alt (Windows, LibreOffice), or Option (Mac). I doubt we want to adopt
any of those.

So let's use control-shift-u for this. Unfortunately, it's currently
assigned to show-urls-launch, which is unfortunate, but
insurmountable. We can reassign this keybinding elsewhere. I have
picked control-shift-o in my configuration, because "o" is a good
mnemonic for "open URLs". Others have suggested "m" instead.

Closes: #1183

CHANGELOG.md

@@ -64,6 +64,9 @@
 ### Changed
 
 * Minimum required meson version is now 0.59 ([#1371][1371]).
+* `Control+Shift+u` now bound to `unicode-input` to follow the
+  convention established in GTK and Qt, `show-urls-launch` now bound
+  to `Control+Shift+o` ([#1183][1183])
 * Kitty keyboard protocol: F3 is now encoded as `CSI 13~` instead of
   `CSI R`. The kitty keyboard protocol originally allowed F3 to be
   encoded as `CSI R`, but this was removed from the specification
@@ -92,6 +95,7 @@
   removed.
 
 [1371]: https://codeberg.org/dnkl/foot/pulls/1371
+[1183]: https://codeberg.org/dnkl/foot/issues/1183
 [1360]: https://codeberg.org/dnkl/foot/issues/1360
 [1383]: https://codeberg.org/dnkl/foot/issues/1383
 

config.c

@@ -2807,7 +2807,8 @@ add_default_key_bindings(struct config *conf)
         {BIND_ACTION_FONT_SIZE_RESET, m_ctrl, {{XKB_KEY_0}}},
         {BIND_ACTION_FONT_SIZE_RESET, m_ctrl, {{XKB_KEY_KP_0}}},
         {BIND_ACTION_SPAWN_TERMINAL, m_ctrl_shift, {{XKB_KEY_n}}},
-        {BIND_ACTION_SHOW_URLS_LAUNCH, m_ctrl_shift, {{XKB_KEY_u}}},
+        {BIND_ACTION_SHOW_URLS_LAUNCH, m_ctrl_shift, {{XKB_KEY_o}}},
+        {BIND_ACTION_UNICODE_INPUT, m_ctrl_shift, {{XKB_KEY_u}}},
         {BIND_ACTION_PROMPT_PREV, m_ctrl_shift, {{XKB_KEY_z}}},
         {BIND_ACTION_PROMPT_NEXT, m_ctrl_shift, {{XKB_KEY_x}}},
     };

doc/foot.1.scd

@@ -310,7 +310,7 @@ Foot supports URL detection. But, unlike many other terminal
 emulators, where URLs are highlighted when they are hovered and opened
 by clicking on them, foot uses a keyboard driven approach.
 
-Pressing *ctrl*+*shift*+*u* enters _“URL mode”_, where all currently
+Pressing *ctrl*+*shift*+*o* enters _“Open URL mode”_, where all currently
 visible URLs are underlined, and is associated with a
 _“jump-label”_. The jump-label indicates the _key sequence_
 (e.g. *”AF”*) to use to activate the URL.

doc/foot.ini.5.scd

@@ -834,7 +834,7 @@ e.g. *search-start=none*.
 *show-urls-launch*
 	Enter URL mode, where all currently visible URLs are tagged with a
 	jump label with a key sequence that will open the URL (and exit
-	URL mode). Default: _Control+Shift+u_.
+	URL mode). Default: _Control+Shift+o_.
 
 *show-urls-persistent*
 	Similar to *show-urls-launch*, but does not automatically exit URL
@@ -877,7 +877,7 @@ e.g. *search-start=none*.
 	fallback. The preferred way of entering Unicode characters, emojis
 	etc is by using an IME.
 	
-	Default: _none_.
+	Default: _Control+Shift+u_.
 
 # SECTION: search-bindings
 

foot.ini

@@ -152,12 +152,12 @@
 # pipe-visible=[sh -c "xurls | fuzzel | xargs -r firefox"] none
 # pipe-scrollback=[sh -c "xurls | fuzzel | xargs -r firefox"] none
 # pipe-selected=[xargs -r firefox] none
-# show-urls-launch=Control+Shift+u
+# show-urls-launch=Control+Shift+o
 # show-urls-copy=none
 # show-urls-persistent=none
 # prompt-prev=Control+Shift+z
 # prompt-next=Control+Shift+x
-# unicode-input=none
+# unicode-input=Control+Shift+u
 # noop=none
 
 [search-bindings]