vim-patch:9.0.1208: code is indented more than necessary (#21846)

Problem:    Code is indented more than necessary.
Solution:   Use an early return where it makes sense. (Yegappan Lakshmanan,
            closes vim/vim#11819)

a41e221935

Cherry-pick check_text_or_curbuf_locked() from patch 9.0.0947.

Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>

src/nvim/normal.c

@@ -451,12 +451,34 @@ static int find_command(int cmdchar)
 /// message, return true.
 static bool check_text_locked(oparg_T *oap)
 {
-  if (text_locked()) {
+  if (!text_locked()) {
+    return false;
+  }
+
+  if (oap != NULL) {
     clearopbeep(oap);
+  }
   text_locked_msg();
   return true;
+}
+
+/// If text is locked, "curbuf->b_ro_locked" or "allbuf_lock" is set:
+/// Give an error message, possibly beep and return true.
+/// "oap" may be NULL.
+static bool check_text_or_curbuf_locked(oparg_T *oap)
+{
+  if (check_text_locked(oap)) {
+    return true;
   }
+
+  if (!curbuf_locked()) {
     return false;
+  }
+
+  if (oap != NULL) {
+    clearop(oap);
+  }
+  return true;
 }
 
 /// Normal state entry point. This is called on:
@@ -1107,8 +1129,7 @@ static int normal_execute(VimState *state, int key)
     goto finish;
   }
 
-  if ((nv_cmds[s->idx].cmd_flags & NV_NCW)
-      && (check_text_locked(&s->oa) || curbuf_locked())) {
+  if ((nv_cmds[s->idx].cmd_flags & NV_NCW) && check_text_or_curbuf_locked(&s->oa)) {
     // this command is not allowed now
     s->command_finished = true;
     goto finish;
@@ -2191,7 +2212,10 @@ static void nv_addsub(cmdarg_T *cap)
 /// CTRL-F, CTRL-B, etc: Scroll page up or down.
 static void nv_page(cmdarg_T *cap)
 {
-  if (!checkclearop(cap->oap)) {
+  if (checkclearop(cap->oap)) {
+    return;
+  }
+
   if (mod_mask & MOD_MASK_CTRL) {
     // <C-PageUp>: tab page back; <C-PageDown>: tab page forward
     if (cap->arg == BACKWARD) {
@@ -2202,7 +2226,6 @@ static void nv_page(cmdarg_T *cap)
   } else {
     (void)onepage(cap->arg, cap->count1);
   }
-  }
 }
 
 /// Implementation of "gd" and "gD" command.
@@ -2215,7 +2238,9 @@ static void nv_gd(oparg_T *oap, int nchar, int thisblock)
   if ((len = find_ident_under_cursor(&ptr, FIND_IDENT)) == 0
       || !find_decl((char_u *)ptr, len, nchar == 'd', thisblock, SEARCH_START)) {
     clearopbeep(oap);
-  } else {
+    return;
+  }
+
   if ((fdo_flags & FDO_SEARCH) && KeyTyped && oap->op_type == OP_NOP) {
     foldOpenCursor();
   }
@@ -2223,7 +2248,6 @@ static void nv_gd(oparg_T *oap, int nchar, int thisblock)
   if (messaging() && !msg_silent && !shortmess(SHM_SEARCHCOUNT)) {
     clear_cmdline = true;
   }
-  }
 }
 
 /// @return true if line[offset] is not inside a C-style comment or string,
@@ -3195,7 +3219,9 @@ static void nv_colon(cmdarg_T *cap)
 
   if (VIsual_active && !is_cmdkey && !is_lua) {
     nv_operator(cap);
-  } else {
+    return;
+  }
+
   if (cap->oap->op_type != OP_NOP) {
     // Using ":" as a movement is charwise exclusive.
     cap->oap->motion_type = kMTCharWise;
@@ -3233,7 +3259,6 @@ static void nv_colon(cmdarg_T *cap)
     // The start of the operator has become invalid by the Ex command.
     clearopbeep(cap->oap);
   }
-  }
 }
 
 /// Handle CTRL-G command.
@@ -3263,14 +3288,16 @@ static void nv_ctrlh(cmdarg_T *cap)
 /// CTRL-L: clear screen and redraw.
 static void nv_clear(cmdarg_T *cap)
 {
-  if (!checkclearop(cap->oap)) {
+  if (checkclearop(cap->oap)) {
+    return;
+  }
+
   // Clear all syntax states to force resyncing.
   syn_stack_free_all(curwin->w_s);
   FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
     wp->w_s->b_syn_slow = false;
   }
   redraw_later(curwin, UPD_CLEAR);
-  }
 }
 
 /// CTRL-O: In Select mode: switch to Visual mode for one command.
@@ -3301,7 +3328,10 @@ static void nv_hat(cmdarg_T *cap)
 /// "Z" commands.
 static void nv_Zet(cmdarg_T *cap)
 {
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   switch (cap->nchar) {
   // "ZZ": equivalent to ":x".
   case 'Z':
@@ -3316,7 +3346,6 @@ static void nv_Zet(cmdarg_T *cap)
   default:
     clearopbeep(cap->oap);
   }
-  }
 }
 
 /// Call nv_ident() as if "c1" was used, with "c2" as next character.
@@ -3846,14 +3875,15 @@ static void nv_up(cmdarg_T *cap)
     // <S-Up> is page up
     cap->arg = BACKWARD;
     nv_page(cap);
-  } else {
+    return;
+  }
+
   cap->oap->motion_type = kMTLineWise;
   if (cursor_up(cap->count1, cap->oap->op_type == OP_NOP) == false) {
     clearopbeep(cap->oap);
   } else if (cap->arg) {
     beginline(BL_WHITE | BL_FIX);
   }
-  }
 }
 
 /// Cursor down commands.
@@ -3895,11 +3925,7 @@ static void nv_gotofile(cmdarg_T *cap)
   char *ptr;
   linenr_T lnum = -1;
 
-  if (check_text_locked(cap->oap)) {
-    return;
-  }
-  if (curbuf_locked()) {
-    clearop(cap->oap);
+  if (check_text_or_curbuf_locked(cap->oap)) {
     return;
   }
 
@@ -4058,7 +4084,9 @@ static void nv_csearch(cmdarg_T *cap)
   cap->oap->motion_type = kMTCharWise;
   if (IS_SPECIAL(cap->nchar) || searchc(cap, t_cmd) == false) {
     clearopbeep(cap->oap);
-  } else {
+    return;
+  }
+
   curwin->w_set_curswant = true;
   // Include a Tab for "tx" and for "dfx".
   if (gchar_cursor() == TAB && virtual_active() && cap->arg == FORWARD
@@ -4074,7 +4102,6 @@ static void nv_csearch(cmdarg_T *cap)
   if ((fdo_flags & FDO_HOR) && KeyTyped && cap->oap->op_type == OP_NOP) {
     foldOpenCursor();
   }
-  }
 }
 
 /// "[{", "[(", "]}" or "])": go to Nth unclosed '{', '(', '}' or ')'
@@ -4395,26 +4422,29 @@ static void nv_brace(cmdarg_T *cap)
   cap->oap->inclusive = false;
   curwin->w_set_curswant = true;
 
-  if (findsent(cap->arg, cap->count1) == false) {
+  if (findsent(cap->arg, cap->count1) == FAIL) {
     clearopbeep(cap->oap);
-  } else {
+    return;
+  }
+
   // Don't leave the cursor on the NUL past end of line.
   adjust_cursor(cap->oap);
   curwin->w_cursor.coladd = 0;
   if ((fdo_flags & FDO_BLOCK) && KeyTyped && cap->oap->op_type == OP_NOP) {
     foldOpenCursor();
   }
-  }
 }
 
 /// "m" command: Mark a position.
 static void nv_mark(cmdarg_T *cap)
 {
-  if (!checkclearop(cap->oap)) {
+  if (checkclearop(cap->oap)) {
+    return;
+  }
+
   if (setmark(cap->nchar) == false) {
     clearopbeep(cap->oap);
   }
-  }
 }
 
 /// "{" and "}" commands.
@@ -4427,12 +4457,13 @@ static void nv_findpar(cmdarg_T *cap)
   curwin->w_set_curswant = true;
   if (!findpar(&cap->oap->inclusive, cap->arg, cap->count1, NUL, false)) {
     clearopbeep(cap->oap);
-  } else {
+    return;
+  }
+
   curwin->w_cursor.coladd = 0;
   if ((fdo_flags & FDO_BLOCK) && KeyTyped && cap->oap->op_type == OP_NOP) {
     foldOpenCursor();
   }
-  }
 }
 
 /// "u" command: Undo or make lower case.
@@ -4452,14 +4483,16 @@ static void nv_undo(cmdarg_T *cap)
 /// <Undo> command.
 static void nv_kundo(cmdarg_T *cap)
 {
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   if (bt_prompt(curbuf)) {
     clearopbeep(cap->oap);
     return;
   }
   u_undo((int)cap->count1);
   curwin->w_set_curswant = true;
-  }
 }
 
 /// Handle the "r" command.
@@ -4670,7 +4703,13 @@ static void nv_Replace(cmdarg_T *cap)
     VIsual_mode_orig = VIsual_mode;     // remember original area for gv
     VIsual_mode = 'V';
     nv_operator(cap);
-  } else if (!checkclearopq(cap->oap)) {
+    return;
+  }
+
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   if (!MODIFIABLE(curbuf)) {
     emsg(_(e_modifiable));
   } else {
@@ -4679,7 +4718,6 @@ static void nv_Replace(cmdarg_T *cap)
     }
     invoke_edit(cap, false, cap->arg ? 'V' : 'R', false);
   }
-  }
 }
 
 /// "gr".
@@ -4689,7 +4727,13 @@ static void nv_vreplace(cmdarg_T *cap)
     cap->cmdchar = 'r';
     cap->nchar = cap->extra_char;
     nv_replace(cap);            // Do same as "r" in Visual mode for now
-  } else if (!checkclearopq(cap->oap)) {
+    return;
+  }
+
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   if (!MODIFIABLE(curbuf)) {
     emsg(_(e_modifiable));
   } else {
@@ -4703,7 +4747,6 @@ static void nv_vreplace(cmdarg_T *cap)
     }
     invoke_edit(cap, true, 'v', false);
   }
-  }
 }
 
 /// Swap case for "~" command, when it does not work like an operator.
@@ -4903,7 +4946,10 @@ static void nv_pcmark(cmdarg_T *cap)
   MarkMoveRes move_res = 0;  // Result from moving to the mark
   const bool old_KeyTyped = KeyTyped;  // getting file may reset it.
 
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   if (cap->cmdchar == TAB && mod_mask == MOD_MASK_CTRL) {
     if (!goto_tabpage_lastused()) {
       clearopbeep(cap->oap);
@@ -4939,7 +4985,6 @@ static void nv_pcmark(cmdarg_T *cap)
       && old_KeyTyped) {
     foldOpenCursor();
   }
-  }
 }
 
 /// Handle '"' command.
@@ -5669,7 +5714,10 @@ static void nv_g_cmd(cmdarg_T *cap)
 /// Handle "o" and "O" commands.
 static void n_opencmd(cmdarg_T *cap)
 {
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   if (cap->cmdchar == 'O') {
     // Open above the first line of a folded sequence of lines
     (void)hasFolding(curwin->w_cursor.lnum,
@@ -5692,20 +5740,21 @@ static void n_opencmd(cmdarg_T *cap)
     }
     invoke_edit(cap, false, cap->cmdchar, true);
   }
-  }
 }
 
 /// "." command: redo last change.
 static void nv_dot(cmdarg_T *cap)
 {
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   // If "restart_edit" is true, the last but one command is repeated
   // instead of the last command (inserting text). This is used for
   // CTRL-O <.> in insert mode.
   if (start_redo(cap->count0, restart_edit != 0 && !arrow_used) == false) {
     clearopbeep(cap->oap);
   }
-  }
 }
 
 /// CTRL-R: undo undo or specify register in select mode
@@ -5728,10 +5777,12 @@ static void nv_redo_or_register(cmdarg_T *cap)
     return;
   }
 
-  if (!checkclearopq(cap->oap)) {
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   u_redo((int)cap->count1);
   curwin->w_set_curswant = true;
-  }
 }
 
 /// Handle "U" command.
@@ -5743,10 +5794,15 @@ static void nv_Undo(cmdarg_T *cap)
     cap->cmdchar = 'g';
     cap->nchar = 'U';
     nv_operator(cap);
-  } else if (!checkclearopq(cap->oap)) {
+    return;
+  }
+
+  if (checkclearopq(cap->oap)) {
+    return;
+  }
+
   u_undoline();
   curwin->w_set_curswant = true;
-  }
 }
 
 /// '~' command: If tilde is not an operator and Visual is off: swap case of a
@@ -6309,7 +6365,13 @@ static void nv_record(cmdarg_T *cap)
     cap->cmdchar = 'g';
     cap->nchar = 'q';
     nv_operator(cap);
-  } else if (!checkclearop(cap->oap)) {
+    return;
+  }
+
+  if (checkclearop(cap->oap)) {
+    return;
+  }
+
   if (cap->nchar == ':' || cap->nchar == '/' || cap->nchar == '?') {
     stuffcharReadbuff(cap->nchar);
     stuffcharReadbuff(K_CMDWIN);
@@ -6320,7 +6382,6 @@ static void nv_record(cmdarg_T *cap)
       clearopbeep(cap->oap);
     }
   }
-  }
 }
 
 /// Handle the "@r" command.
@@ -6360,7 +6421,13 @@ static void nv_join(cmdarg_T *cap)
 {
   if (VIsual_active) {  // join the visual lines
     nv_operator(cap);
-  } else if (!checkclearop(cap->oap)) {
+    return;
+  }
+
+  if (checkclearop(cap->oap)) {
+    return;
+  }
+
   if (cap->count0 <= 1) {
     cap->count0 = 2;  // default for join is two lines!
   }
@@ -6377,7 +6444,6 @@ static void nv_join(cmdarg_T *cap)
   prep_redo(cap->oap->regname, cap->count0,
             NUL, cap->cmdchar, NUL, NUL, cap->nchar);
   do_join((size_t)cap->count0, cap->nchar == NUL, true, true, true);
-  }
 }
 
 /// "P", "gP", "p" and "gp" commands.
@@ -6407,9 +6473,14 @@ static void nv_put_opt(cmdarg_T *cap, bool fix_indent)
     } else {
       clearopbeep(cap->oap);
     }
-  } else if (bt_prompt(curbuf) && !prompt_curpos_editable()) {
+    return;
+  }
+
+  if (bt_prompt(curbuf) && !prompt_curpos_editable()) {
     clearopbeep(cap->oap);
-  } else {
+    return;
+  }
+
   if (fix_indent) {
     dir = (cap->cmdchar == ']' && cap->nchar == 'p')
       ? FORWARD : BACKWARD;
@@ -6517,7 +6588,6 @@ static void nv_put_opt(cmdarg_T *cap, bool fix_indent)
     }
   }
   auto_format(false, true);
-  }
 }
 
 /// "o" and "O" commands.

src/nvim/ops.c

@@ -1785,10 +1785,12 @@ setmarks:
 /// Used for deletion.
 static void mb_adjust_opend(oparg_T *oap)
 {
-  if (oap->inclusive) {
+  if (!oap->inclusive) {
+    return;
+  }
+
   char *p = ml_get(oap->end.lnum);
   oap->end.col += utf_cp_tail_off(p, p + oap->end.col);
-  }
 }
 
 /// Put character 'c' at position 'lp'
@@ -3711,10 +3713,14 @@ void adjust_cursor_eol(void)
 {
   unsigned int cur_ve_flags = get_ve_flags();
 
-  if (curwin->w_cursor.col > 0
+  const bool adj_cursor = (curwin->w_cursor.col > 0
                            && gchar_cursor() == NUL
                            && (cur_ve_flags & VE_ONEMORE) == 0
-      && !(restart_edit || (State & MODE_INSERT))) {
+                           && !(restart_edit || (State & MODE_INSERT)));
+  if (!adj_cursor) {
+    return;
+  }
+
   // Put the cursor on the last character in the line.
   dec_cursor();
 
@@ -3725,7 +3731,6 @@ void adjust_cursor_eol(void)
     getvcol(curwin, &curwin->w_cursor, &scol, NULL, &ecol);
     curwin->w_cursor.coladd = ecol - scol + 1;
   }
-  }
 }
 
 /// @return  true if lines starting with '#' should be left aligned.
@@ -4205,11 +4210,13 @@ static bool reset_lbr(void)
 /// Restore 'linebreak' and take care of side effects.
 static void restore_lbr(bool lbr_saved)
 {
-  if (!curwin->w_p_lbr && lbr_saved) {
+  if (curwin->w_p_lbr || !lbr_saved) {
+    return;
+  }
+
   // changing 'linebreak' may require w_virtcol to be updated
   curwin->w_p_lbr = true;
   curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL);
-  }
 }
 
 /// prepare a few things for block mode yank/delete/tilde

src/nvim/option.c

@@ -674,7 +674,10 @@ void set_helplang_default(const char *lang)
     return;
   }
   int idx = findoption("hlg");
-  if (idx >= 0 && !(options[idx].flags & P_WAS_SET)) {
+  if (idx < 0 || (options[idx].flags & P_WAS_SET)) {
+    return;
+  }
+
   if (options[idx].flags & P_ALLOCED) {
     free_string_option(p_hlg);
   }
@@ -690,7 +693,6 @@ void set_helplang_default(const char *lang)
   }
   p_hlg[2] = NUL;
   options[idx].flags |= P_ALLOCED;
-  }
 }
 
 /// 'title' and 'icon' only default to true if they have not been set or reset
@@ -5035,10 +5037,11 @@ bool option_was_set(const char *name)
 void reset_option_was_set(const char *name)
 {
   const int idx = findoption(name);
-
-  if (idx >= 0) {
-    options[idx].flags &= ~P_WAS_SET;
+  if (idx < 0) {
+    return;
   }
+
+  options[idx].flags &= ~P_WAS_SET;
 }
 
 /// fill_breakat_flags() -- called when 'breakat' changes value.

src/nvim/optionstr.c

@@ -167,9 +167,11 @@ void trigger_optionset_string(int opt_idx, int opt_flags, char *oldval, char *ol
                               char *oldval_g, char *newval)
 {
   // Don't do this recursively.
-  if (oldval != NULL
-      && newval != NULL
-      && *get_vim_var_str(VV_OPTION_TYPE) == NUL) {
+  if (oldval == NULL || newval == NULL
+      || *get_vim_var_str(VV_OPTION_TYPE) != NUL) {
+    return;
+  }
+
   char buf_type[7];
 
   vim_snprintf(buf_type, ARRAY_SIZE(buf_type), "%s",
@@ -196,7 +198,6 @@ void trigger_optionset_string(int opt_idx, int opt_flags, char *oldval, char *ol
   }
   apply_autocmds(EVENT_OPTIONSET, get_option(opt_idx)->fullname, NULL, false, NULL);
   reset_v_option_vars();
-  }
 }
 
 static char *illegal_char(char *errbuf, size_t errbuflen, int c)