refactor: eliminate misc2.c

move `call_shell` to misc1.c
Move some fns to state.c
Move some fns to option.c
Move some fns to memline.c
Move `vim_chdir*` fns to file_search.c
Move some fns to new module, bytes.c
Move some fns to fileio.c

src/nvim/misc1.c

@@ -31,7 +31,6 @@
 #include "nvim/memline.h"
 #include "nvim/memory.h"
 #include "nvim/message.h"
-#include "nvim/misc2.h"
 #include "nvim/garray.h"
 #include "nvim/move.h"
 #include "nvim/mouse.h"
@@ -41,6 +40,7 @@
 #include "nvim/regexp.h"
 #include "nvim/screen.h"
 #include "nvim/search.h"
+#include "nvim/state.h"
 #include "nvim/strings.h"
 #include "nvim/tag.h"
 #include "nvim/ui.h"
@@ -1745,18 +1745,6 @@ int gchar_pos(pos_T *pos)
   return (int)*ptr;
 }
 
-/*
- * Skip to next part of an option argument: Skip space and comma.
- */
-char_u *skip_to_option_part(char_u *p)
-{
-  if (*p == ',')
-    ++p;
-  while (*p == ' ')
-    ++p;
-  return p;
-}
-
 /*
  * Call this function when something in the current buffer is changed.
  *
@@ -2691,6 +2679,42 @@ void fast_breakcheck(void)
   }
 }
 
+// Call shell. Calls os_call_shell, with 'shellxquote' added.
+int call_shell(char_u *cmd, ShellOpts opts, char_u *extra_shell_arg)
+{
+  int retval;
+  proftime_T wait_time;
+
+  if (p_verbose > 3) {
+    verbose_enter();
+    smsg(_("Calling shell to execute: \"%s\""),
+         cmd == NULL ? p_sh : cmd);
+    ui_putc('\n');
+    verbose_leave();
+  }
+
+  if (do_profiling == PROF_YES) {
+    prof_child_enter(&wait_time);
+  }
+
+  if (*p_sh == NUL) {
+    EMSG(_(e_shellempty));
+    retval = -1;
+  } else {
+    // The external command may update a tags file, clear cached tags.
+    tag_freematch();
+
+    retval = os_call_shell(cmd, opts, extra_shell_arg);
+  }
+
+  set_vim_var_nr(VV_SHELL_ERROR, (varnumber_T)retval);
+  if (do_profiling == PROF_YES) {
+    prof_child_exit(&wait_time);
+  }
+
+  return retval;
+}
+
 /// Get the stdout of an external command.
 /// If "ret_len" is NULL replace NUL characters with NL. When "ret_len" is not
 /// NULL store the length there.