term: Remove most calls to settmode

Nvim now relies much less on setting terminal mode to cooked mode, remove most
calls to settmode, except for those that happen on startup or when suspending.
Eventually even those will be handled by the UI layer.

src/nvim/ex_cmds2.c

@@ -157,7 +157,6 @@ void do_debug(char_u *cmd)
 
   /* Make sure we are in raw mode and start termcap mode.  Might have side
    * effects... */
-  settmode(TMODE_RAW);
   starttermcap();
 
   ++RedrawingDisabled;          /* don't redisplay the window */

src/nvim/ex_docmd.c

@@ -5107,7 +5107,6 @@ static void ex_highlight(exarg_T *eap)
 void not_exiting(void)
 {
   exiting = FALSE;
-  settmode(TMODE_RAW);
 }
 
 /*
@@ -5994,7 +5993,6 @@ do_exedit (
 {
   int n;
   int need_hide;
-  int exmode_was = exmode_active;
 
   /*
    * ":vi" command ends Ex mode.
@@ -6014,8 +6012,6 @@ do_exedit (
           eap->nextcmd = NULL;
         }
 
-        if (exmode_was != EXMODE_VIM)
-          settmode(TMODE_RAW);
         RedrawingDisabled = 0;
         no_wait_return = 0;
         need_wait_return = FALSE;

src/nvim/ex_getln.c

@@ -270,10 +270,6 @@ getcmdline (
   setmouse();
   ui_cursor_shape();            /* may show different cursor shape */
 
-  /* When inside an autocommand for writing "exiting" may be set and
-  * terminal mode set to cooked.  Need to set raw mode here then. */
-  settmode(TMODE_RAW);
-
   init_history();
   hiscnt = hislen;              /* set hiscnt to impossible history value */
   histype = hist_char2type(firstc);

src/nvim/fileio.c

@@ -1812,7 +1812,6 @@ failed:
      * Switch on raw mode now and clear the screen.
      */
     if (read_stdin) {
-      settmode(TMODE_RAW);              /* set to raw mode */
       starttermcap();
       screenclear();
     }
@@ -2387,9 +2386,6 @@ buf_write (
   else
     overwriting = FALSE;
 
-  if (exiting)
-    settmode(TMODE_COOK);           /* when exiting allow typeahead now */
-
   ++no_wait_return;                 /* don't wait for return yet */
 
   /*

src/nvim/misc1.c

@@ -2286,8 +2286,6 @@ int ask_yesno(char_u *str, int direct)
   int r = ' ';
   int save_State = State;
 
-  if (exiting)                  /* put terminal in raw mode for this question */
-    settmode(TMODE_RAW);
   ++no_wait_return;
 #ifdef USE_ON_FLY_SCROLL
   dont_scroll = TRUE;           /* disallow scrolling here */

src/nvim/os/shell.c

@@ -104,14 +104,10 @@ int os_call_shell(char_u *cmd, ShellOpts opts, char_u *extra_arg)
 {
   DynamicBuffer input = DYNAMIC_BUFFER_INIT;
   char *output = NULL, **output_ptr = NULL;
-  int current_state = State, old_mode = cur_tmode;
+  int current_state = State;
   bool forward_output = true;
   out_flush();
 
-  if (opts & kShellOptCooked) {
-    settmode(TMODE_COOK);
-  }
-
   // While the child is running, ignore terminating signals
   signal_reject_deadly();
 
@@ -155,10 +151,6 @@ int os_call_shell(char_u *cmd, ShellOpts opts, char_u *extra_arg)
     msg_putchar('\n');
   }
 
-  if (old_mode == TMODE_RAW) {
-    // restore mode
-    settmode(TMODE_RAW);
-  }
   State = current_state;
   signal_accept_deadly();
 

src/nvim/os/time.c

@@ -6,6 +6,7 @@
 #include <uv.h>
 
 #include "nvim/os/time.h"
+#include "nvim/os/event.h"
 #include "nvim/vim.h"
 #include "nvim/term.h"
 
@@ -38,31 +39,22 @@ uint64_t os_hrtime(void)
 /// @param ignoreinput If true, allow a SIGINT to interrupt us
 void os_delay(uint64_t milliseconds, bool ignoreinput)
 {
-  os_microdelay(milliseconds * 1000, ignoreinput);
+  if (ignoreinput) {
+    if (milliseconds > INT_MAX) {
+      milliseconds = INT_MAX;
+    }
+    event_poll_until((int)milliseconds, got_int);
+  } else {
+    os_microdelay(milliseconds * 1000);
+  }
 }
 
 /// Sleeps for a certain amount of microseconds
 ///
 /// @param microseconds Number of microseconds to sleep
-/// @param ignoreinput If true, allow a SIGINT to interrupt us
-void os_microdelay(uint64_t microseconds, bool ignoreinput)
+void os_microdelay(uint64_t microseconds)
 {
-  int old_tmode;
-
-  if (ignoreinput) {
-    // Go to cooked mode without echo, to allow SIGINT interrupting us
-    // here
-    old_tmode = curr_tmode;
-
-    if (curr_tmode == TMODE_RAW)
-      settmode(TMODE_SLEEP);
-
-    microdelay(microseconds);
-
-    settmode(old_tmode);
-  } else {
-    microdelay(microseconds);
-  }
+  microdelay(microseconds);
 }
 
 /// Portable version of POSIX localtime_r()

src/nvim/term.c

@@ -1865,7 +1865,7 @@ void term_write(char_u *s, size_t len)
 
 #ifdef UNIX
   if (p_wd) {           // Unix is too fast, slow down a bit more
-    os_microdelay(p_wd, false);
+    os_microdelay(p_wd);
   }
 #endif
 }