selection: extract text: also copy combining characters

selection.c

@@ -46,7 +46,7 @@ selection_on_row_in_view(const struct terminal *term, int row_no)
 static void
 foreach_selected_normal(
     struct terminal *term, struct coord _start, struct coord _end,
-    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, void *data),
+    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, int col, void *data),
     void *data)
 {
     const struct coord *start = &_start;
@@ -80,7 +80,7 @@ foreach_selected_normal(
              c <= (r == end_row ? end_col : term->cols - 1);
              c++)
         {
-            cb(term, row, &row->cells[c], data);
+            cb(term, row, &row->cells[c], c, data);
         }
 
         start_col = 0;
@@ -90,7 +90,7 @@ foreach_selected_normal(
 static void
 foreach_selected_block(
     struct terminal *term, struct coord _start, struct coord _end,
-    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, void *data),
+    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, int col, void *data),
     void *data)
 {
     const struct coord *start = &_start;
@@ -112,14 +112,14 @@ foreach_selected_block(
         assert(row != NULL);
 
         for (int c = top_left.col; c <= bottom_right.col; c++)
-            cb(term, row, &row->cells[c], data);
+            cb(term, row, &row->cells[c], c, data);
     }
 }
 
 static void
 foreach_selected(
     struct terminal *term, struct coord start, struct coord end,
-    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, void *data),
+    void (*cb)(struct terminal *term, struct row *row, struct cell *cell, int col, void *data),
     void *data)
 {
     switch (term->selection.kind) {
@@ -142,6 +142,8 @@ min_bufsize_for_extraction(const struct terminal *term)
 {
     const struct coord *start = &term->selection.start;
     const struct coord *end = &term->selection.end;
+    const size_t chars_per_cell
+        = 1 + ALEN(term->grid->cur_row->comb_chars[0].chars);
 
     switch (term->selection.kind) {
     case SELECTION_NONE:
@@ -160,7 +162,7 @@ min_bufsize_for_extraction(const struct terminal *term)
         }
 
         if (start->row == end->row)
-            return end->col - start->col + 1;
+            return (end->col - start->col + 1) * chars_per_cell;
         else {
             size_t cells = 0;
 
@@ -169,7 +171,7 @@ min_bufsize_for_extraction(const struct terminal *term)
             cells += term->cols - start->col + 1;
             cells += (term->cols + 1) * (end->row - start->row - 1);
             cells += end->col + 1 + 1;
-            return cells;
+            return cells * chars_per_cell;
         }
 
     case SELECTION_BLOCK: {
@@ -186,7 +188,7 @@ min_bufsize_for_extraction(const struct terminal *term)
         /* Add one extra column on each row, for \n */
         int cols = bottom_right.col - top_left.col + 1 + 1;
         int rows = bottom_right.row - top_left.row + 1;
-        return rows * cols;
+        return rows * cols * chars_per_cell;
     }
     }
 
@@ -199,13 +201,13 @@ struct extract {
     size_t size;
     size_t idx;
     size_t empty_count;
-    struct row *last_row;
-    struct cell *last_cell;
+    const struct row *last_row;
+    const struct cell *last_cell;
 };
 
 static void
 extract_one(struct terminal *term, struct row *row, struct cell *cell,
-            void *data)
+            int col, void *data)
 {
     struct extract *ctx = data;
 
@@ -235,6 +237,13 @@ extract_one(struct terminal *term, struct row *row, struct cell *cell,
     assert(ctx->idx + 1 <= ctx->size);
     ctx->buf[ctx->idx++] = cell->wc;
 
+    const struct combining_chars *comb_chars = &row->comb_chars[col];
+
+    assert(cell->wc != 0);
+    assert(ctx->idx + comb_chars->count <= ctx->size);
+    for (size_t i = 0; i < comb_chars->count; i++)
+        ctx->buf[ctx->idx++] = comb_chars->chars[i];
+
     ctx->last_row = row;
     ctx->last_cell = cell;
 }
@@ -299,7 +308,7 @@ selection_start(struct terminal *term, int col, int row,
 
 static void
 unmark_selected(struct terminal *term, struct row *row, struct cell *cell,
-                void *data)
+                int col, void *data)
 {
     if (cell->attrs.selected == 0 || (cell->attrs.selected & 2)) {
         /* Ignore if already deselected, or if premarked for updated selection */
@@ -313,7 +322,7 @@ unmark_selected(struct terminal *term, struct row *row, struct cell *cell,
 
 static void
 premark_selected(struct terminal *term, struct row *row, struct cell *cell,
-              void *data)
+                 int col, void *data)
 {
     /* Tell unmark to leave this be */
     cell->attrs.selected |= 2;
@@ -321,7 +330,7 @@ premark_selected(struct terminal *term, struct row *row, struct cell *cell,
 
 static void
 mark_selected(struct terminal *term, struct row *row, struct cell *cell,
-              void *data)
+              int col, void *data)
 {
     if (cell->attrs.selected & 1) {
         cell->attrs.selected = 1;  /* Clear the pre-mark bit */