rename: UIAttach/UIDetach => UIEnter/UILeave

"enter"/"leave" is more conventional for Vim events, and
"attach"/"detach" distinction does not gain much.

runtime/doc/autocmd.txt

@@ -280,8 +280,8 @@ Name			triggered by ~
 
 	Startup and exit
 |VimEnter|		after doing all the startup stuff
-|UIAttach|		after a UI attaches
+|UIEnter|		after a UI attaches
-|UIDetach|		after a UI detaches
+|UILeave|		after a UI detaches
 |TermResponse|		after the terminal response to t_RV is received
 |QuitPre|		when using `:quit`, before deciding whether to exit
 |ExitPre|		when using a command that may make Vim exit
@@ -805,14 +805,14 @@ FuncUndefined			When a user function is used but it isn't
 				NOTE: When writing Vim scripts a better
 				alternative is to use an autoloaded function.
 				See |autoload-functions|.
-							*UIAttach*
+							*UIEnter*
-UIAttach			After a UI connects via |nvim_ui_attach()|,
+UIEnter				After a UI connects via |nvim_ui_attach()|,
 				after VimEnter.  Can be used for GUI-specific
 				configuration.
 				Sets these |v:event| keys:
 				    chan
-							*UIDetach*
+							*UILeave*
-UIDetach			After a UI detaches from Nvim.
+UILeave				After a UI disconnects from Nvim.
 				Sets these |v:event| keys:
 				    chan
 							*InsertChange*

runtime/doc/deprecated.txt

@@ -28,7 +28,7 @@ Environment Variables ~
 Events ~
 *EncodingChanged*	Never fired; 'encoding' is always "utf-8".
 *FileEncoding*		Never fired; equivalent to |EncodingChanged|.
-*GUIEnter*		Never fired; use |UIAttach| instead.
+*GUIEnter*		Never fired; use |UIEnter| instead.
 *GUIFailed*		Never fired.
 
 Keycodes ~

runtime/doc/gui.txt

@@ -12,11 +12,11 @@ Nvim Graphical User Interface				*gui* *GUI*
 Starting the GUI				*gui-start* *E229* *E233*
 
 				*ginit.vim* *gui-init* *gvimrc* *$MYGVIMRC*
-For GUI-specific configuration Nvim provides the |UIAttach| event.  This
+For GUI-specific configuration Nvim provides the |UIEnter| event.  This
 happens after other |initialization|s, like reading your vimrc file.
 
 Example: this sets "g:gui" to the value of the UI's "rgb" field:    >
-	:autocmd UIAttach * let g:gui = filter(nvim_list_uis(),{k,v-> v.chan==v:event.chan})[0].rgb
+	:autocmd UIEnter * let g:gui = filter(nvim_list_uis(),{k,v-> v.chan==v:event.chan})[0].rgb
 <
 
 						*:winp* *:winpos* *E188*

runtime/doc/vim_diff.txt

@@ -154,8 +154,8 @@ Events:
   |TermClose|
   |TermOpen|
   |TextYankPost|
-  |UIAttach|
+  |UIEnter|
-  |UIDetach|
+  |UILeave|
   |VimResume|
   |VimSuspend|
 

src/nvim/aucmd.c

@@ -13,7 +13,7 @@
 # include "aucmd.c.generated.h"
 #endif
 
-void do_autocmd_uiattach(uint64_t chanid, bool attached)
+void do_autocmd_uienter(uint64_t chanid, bool attached)
 {
   static bool recursive = false;
 
@@ -26,7 +26,7 @@ void do_autocmd_uiattach(uint64_t chanid, bool attached)
   assert(chanid < VARNUMBER_MAX);
   tv_dict_add_nr(dict, S_LEN("chan"), (varnumber_T)chanid);
   tv_dict_set_keys_readonly(dict);
-  apply_autocmds(attached ? EVENT_UIATTACH : EVENT_UIDETACH,
+  apply_autocmds(attached ? EVENT_UIENTER : EVENT_UILEAVE,
                  NULL, NULL, false, curbuf);
   tv_dict_clear(dict);
 

src/nvim/auevents.lua

@@ -96,8 +96,8 @@ return {
     'TextChangedI',           -- text was modified in Insert mode(no popup)
     'TextChangedP',           -- text was modified in Insert mode(popup)
     'TextYankPost',           -- after a yank or delete was done (y, d, c)
-    'UIAttach',               -- after a UI attached
+    'UIEnter',                -- after UI attaches
-    'UIDetach',               -- after a UI detaches
+    'UILeave',                -- after UI detaches
     'User',                   -- user defined autocommand
     'VimEnter',               -- after starting Vim
     'VimLeave',               -- before exiting Vim
@@ -125,7 +125,7 @@ return {
     TabNewEntered=true,
     TermClose=true,
     TermOpen=true,
-    UIAttach=true,
+    UIEnter=true,
-    UIDetach=true,
+    UILeave=true,
   },
 }

src/nvim/ui.c

@@ -296,7 +296,7 @@ void ui_attach_impl(UI *ui, uint64_t chanid)
 
   bool is_compositor = (ui == uis[0]);
   if (!is_compositor) {
-    do_autocmd_uiattach(chanid, true);
+    do_autocmd_uienter(chanid, true);
   }
 }
 
@@ -333,7 +333,7 @@ void ui_detach_impl(UI *ui, uint64_t chanid)
     ui_comp_detach(ui);
   }
 
-  do_autocmd_uiattach(chanid, false);
+  do_autocmd_uienter(chanid, false);
 }
 
 void ui_set_ext_option(UI *ui, UIExtension ext, bool active)

test/functional/api/ui_spec.lua

@@ -36,21 +36,21 @@ describe('nvim_ui_attach()', function()
   end)
 end)
 
-it('autocmds UIAttach/UIDetach', function()
+it('autocmds UIEnter/UILeave', function()
   clear{args={
     '--cmd', 'let g:evs = []',
-    '--cmd', 'autocmd UIAttach * :call add(g:evs, "UIAttach") | let g:ui_attach_ev = deepcopy(v:event)',
+    '--cmd', 'autocmd UIEnter * :call add(g:evs, "UIEnter") | let g:uienter_ev = deepcopy(v:event)',
-    '--cmd', 'autocmd UIDetach * :call add(g:evs, "UIDetach") | let g:ui_detach_ev = deepcopy(v:event)',
+    '--cmd', 'autocmd UILeave * :call add(g:evs, "UILeave") | let g:uileave_ev = deepcopy(v:event)',
     '--cmd', 'autocmd VimEnter * :call add(g:evs, "VimEnter")',
   }}
   local screen = Screen.new()
   screen:attach()
-  eq({chan=1}, eval('g:ui_attach_ev'))
+  eq({chan=1}, eval('g:uienter_ev'))
   screen:detach()
-  eq({chan=1}, eval('g:ui_detach_ev'))
+  eq({chan=1}, eval('g:uileave_ev'))
   eq({
     'VimEnter',
-    'UIAttach',
+    'UIEnter',
-    'UIDetach',
+    'UILeave',
   }, eval('g:evs'))
 end)