refactor(float): extract "title" and "title_pos" handling

src/nvim/api/win_config.c

@@ -240,6 +240,48 @@ void nvim_win_set_config(Window window, Dict(float_config) *config, Error *err)
   }
 }
 
+Dictionary config_put_bordertext(Dictionary config, FloatConfig *fconfig,
+                                 BorderTextType bordertext_type)
+{
+  VirtText chunks;
+  AlignTextPos align;
+  char *field_name;
+  char *field_pos_name;
+  if (bordertext_type == kBorderTextTitle) {
+    chunks = fconfig->title_chunks;
+    align = fconfig->title_pos;
+    field_name = "title";
+    field_pos_name = "title_pos";
+  }
+
+  Array bordertext = ARRAY_DICT_INIT;
+  for (size_t i = 0; i < chunks.size; i++) {
+    Array tuple = ARRAY_DICT_INIT;
+    ADD(tuple, CSTR_TO_OBJ(chunks.items[i].text));
+    if (chunks.items[i].hl_id > 0) {
+      ADD(tuple, CSTR_TO_OBJ(syn_id2name(chunks.items[i].hl_id)));
+    }
+    ADD(bordertext, ARRAY_OBJ(tuple));
+  }
+  PUT(config, field_name, ARRAY_OBJ(bordertext));
+
+  char *pos;
+  switch (align) {
+  case kAlignLeft:
+    pos = "left";
+    break;
+  case kAlignCenter:
+    pos = "center";
+    break;
+  case kAlignRight:
+    pos = "right";
+    break;
+  }
+  PUT(config, field_pos_name, CSTR_TO_OBJ(pos));
+
+  return config;
+}
+
 /// Gets window configuration.
 ///
 /// The returned value may be given to |nvim_open_win()|.
@@ -301,26 +343,7 @@ Dictionary nvim_win_get_config(Window window, Error *err)
       }
       PUT(rv, "border", ARRAY_OBJ(border));
       if (config->title) {
-        Array titles = ARRAY_DICT_INIT;
-        VirtText title_datas = config->title_chunks;
-        for (size_t i = 0; i < title_datas.size; i++) {
-          Array tuple = ARRAY_DICT_INIT;
-          ADD(tuple, CSTR_TO_OBJ(title_datas.items[i].text));
-          if (title_datas.items[i].hl_id > 0) {
-            ADD(tuple, CSTR_TO_OBJ(syn_id2name(title_datas.items[i].hl_id)));
-          }
-          ADD(titles, ARRAY_OBJ(tuple));
-        }
-        PUT(rv, "title", ARRAY_OBJ(titles));
-        char *title_pos;
-        if (config->title_pos == kAlignLeft) {
-          title_pos = "left";
-        } else if (config->title_pos == kAlignCenter) {
-          title_pos = "center";
-        } else {
-          title_pos = "right";
-        }
-        PUT(rv, "title_pos", CSTR_TO_OBJ(title_pos));
+        rv = config_put_bordertext(rv, config, kBorderTextTitle);
       }
     }
   }
@@ -381,54 +404,72 @@ static bool parse_float_bufpos(Array bufpos, lpos_T *out)
   return true;
 }
 
-static void parse_border_title(Object title, FloatConfig *fconfig, Error *err)
+static void parse_bordertext(Object bordertext, BorderTextType bordertext_type,
+                             FloatConfig *fconfig, Error *err)
 {
-  if (title.type == kObjectTypeString) {
-    if (title.data.string.size == 0) {
-      fconfig->title = false;
+  bool *is_present;
+  VirtText *chunks;
+  int *width;
+  if (bordertext_type == kBorderTextTitle) {
+    is_present = &fconfig->title;
+    chunks = &fconfig->title_chunks;
+    width = &fconfig->title_width;
+  }
+
+  if (bordertext.type == kObjectTypeString) {
+    if (bordertext.data.string.size == 0) {
+      *is_present = false;
       return;
     }
     int hl_id = syn_check_group(S_LEN("FloatTitle"));
-    kv_push(fconfig->title_chunks, ((VirtTextChunk){ .text = xstrdup(title.data.string.data),
+    kv_push(*chunks, ((VirtTextChunk){ .text = xstrdup(bordertext.data.string.data),
                                        .hl_id = hl_id }));
-    fconfig->title_width = (int)mb_string2cells(title.data.string.data);
-    fconfig->title = true;
+    *width = (int)mb_string2cells(bordertext.data.string.data);
+    *is_present = true;
     return;
   }
 
-  if (title.type != kObjectTypeArray) {
+  if (bordertext.type != kObjectTypeArray) {
     api_set_error(err, kErrorTypeValidation, "title must be string or array");
     return;
   }
 
-  if (title.data.array.size == 0) {
+  if (bordertext.data.array.size == 0) {
     api_set_error(err, kErrorTypeValidation, "title cannot be an empty array");
     return;
   }
 
-  fconfig->title_width = 0;
-  fconfig->title_chunks = parse_virt_text(title.data.array, err, &fconfig->title_width);
+  *width = 0;
+  *chunks = parse_virt_text(bordertext.data.array, err, width);
 
-  fconfig->title = true;
+  *is_present = true;
 }
 
-static bool parse_title_pos(String title_pos, FloatConfig *fconfig, Error *err)
+static bool parse_bordertext_pos(String bordertext_pos, BorderTextType bordertext_type,
+                                 FloatConfig *fconfig, Error *err)
 {
-  if (title_pos.size == 0) {
-    fconfig->title_pos = kAlignLeft;
+  AlignTextPos *align;
+  if (bordertext_type == kBorderTextTitle) {
+    align = &fconfig->title_pos;
+  }
+
+  if (bordertext_pos.size == 0) {
+    *align = kAlignLeft;
     return true;
   }
 
-  char *pos = title_pos.data;
+  char *pos = bordertext_pos.data;
 
   if (strequal(pos, "left")) {
-    fconfig->title_pos = kAlignLeft;
+    *align = kAlignLeft;
   } else if (strequal(pos, "center")) {
-    fconfig->title_pos = kAlignCenter;
+    *align = kAlignCenter;
   } else if (strequal(pos, "right")) {
-    fconfig->title_pos = kAlignRight;
+    *align = kAlignRight;
   } else {
+    if (bordertext_type == kBorderTextTitle) {
       api_set_error(err, kErrorTypeValidation, "invalid title_pos value");
+    }
     return false;
   }
   return true;
@@ -693,13 +734,13 @@ static bool parse_float_config(Dict(float_config) *config, FloatConfig *fconfig,
       clear_virttext(&fconfig->title_chunks);
     }
 
-    parse_border_title(config->title, fconfig, err);
+    parse_bordertext(config->title, kBorderTextTitle, fconfig, err);
     if (ERROR_SET(err)) {
       return false;
     }
 
     // handles unset 'title_pos' same as empty string
-    if (!parse_title_pos(config->title_pos, fconfig, err)) {
+    if (!parse_bordertext_pos(config->title_pos, kBorderTextTitle, fconfig, err)) {
       return false;
     }
   } else {

src/nvim/api/win_config.h

@@ -3,6 +3,7 @@
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
+#include "nvim/buffer_defs.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/win_config.h.generated.h"

src/nvim/buffer_defs.h

@@ -936,6 +936,10 @@ typedef enum {
   kAlignRight  = 2,
 } AlignTextPos;
 
+typedef enum {
+  kBorderTextTitle = 0,
+} BorderTextType;
+
 typedef struct {
   Window window;
   lpos_T bufpos;

src/nvim/drawscreen.c

@@ -701,20 +701,32 @@ void end_search_hl(void)
   screen_search_hl.rm.regprog = NULL;
 }
 
-static void win_border_redr_title(win_T *wp, ScreenGrid *grid, int col)
+static void win_redr_bordertext(win_T *wp, ScreenGrid *grid, VirtText text_chunks, int row, int col)
 {
-  VirtText title_chunks = wp->w_float_config.title_chunks;
-
-  for (size_t i = 0; i < title_chunks.size; i++) {
-    char *text = title_chunks.items[i].text;
+  for (size_t i = 0; i < text_chunks.size; i++) {
+    char *text = text_chunks.items[i].text;
     int cell = (int)mb_string2cells(text);
-    int hl_id = title_chunks.items[i].hl_id;
+    int hl_id = text_chunks.items[i].hl_id;
     int attr = hl_id ? syn_id2attr(hl_id) : 0;
-    grid_puts(grid, text, 0, col, attr);
+    grid_puts(grid, text, row, col, attr);
     col += cell;
   }
 }
 
+int win_get_bordertext_col(int total_col, int text_width, AlignTextPos align)
+{
+  switch (align) {
+  case kAlignLeft:
+    return 1;
+  case kAlignCenter:
+    return (total_col - text_width) / 2 + 1;
+  case kAlignRight:
+    return total_col - text_width + 1;
+  default:
+    abort();
+  }
+}
+
 static void win_redr_border(win_T *wp)
 {
   wp->w_redr_border = false;
@@ -741,17 +753,9 @@ static void win_redr_border(win_T *wp)
     }
 
     if (wp->w_float_config.title) {
-      int title_col = 0;
-      int title_width = wp->w_float_config.title_width;
-      AlignTextPos title_pos = wp->w_float_config.title_pos;
-
-      if (title_pos == kAlignCenter) {
-        title_col = (icol - title_width) / 2 + 1;
-      } else {
-        title_col = title_pos == kAlignLeft ? 1 : icol - title_width + 1;
-      }
-
-      win_border_redr_title(wp, grid, title_col);
+      int title_col = win_get_bordertext_col(icol, wp->w_float_config.title_width,
+                                             wp->w_float_config.title_pos);
+      win_redr_bordertext(wp, grid, wp->w_float_config.title_chunks, 0, title_col);
     }
     if (adj[1]) {
       grid_put_schar(grid, 0, icol + adj[3], chars[2], attrs[2]);