dotemacs

vterm-module.c (51117B)

---

 #include "vterm-module.h"
 #include "elisp.h"
 #include "utf8.h"
 #include <assert.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
 #include <string.h>
 #include <termios.h>
 #include <unistd.h>
 #include <vterm.h>
 
 static LineInfo *alloc_lineinfo() {
   LineInfo *info = malloc(sizeof(LineInfo));
   info->directory = NULL;
   info->prompt_col = -1;
   return info;
 }
 void free_lineinfo(LineInfo *line) {
   if (line == NULL) {
     return;
   }
   if (line->directory != NULL) {
     free(line->directory);
     line->directory = NULL;
   }
   free(line);
 }
 static int term_sb_push(int cols, const VTermScreenCell *cells, void *data) {
   Term *term = (Term *)data;
 
   if (!term->sb_size) {
     return 0;
   }
 
   // copy vterm cells into sb_buffer
   size_t c = (size_t)cols;
   ScrollbackLine *sbrow = NULL;
   if (term->sb_current == term->sb_size) {
     if (term->sb_buffer[term->sb_current - 1]->cols == c) {
       // Recycle old row if it's the right size
       sbrow = term->sb_buffer[term->sb_current - 1];
     } else {
       if (term->sb_buffer[term->sb_current - 1]->info != NULL) {
         free_lineinfo(term->sb_buffer[term->sb_current - 1]->info);
         term->sb_buffer[term->sb_current - 1]->info = NULL;
       }
       free(term->sb_buffer[term->sb_current - 1]);
     }
 
     // Make room at the start by shifting to the right.
     memmove(term->sb_buffer + 1, term->sb_buffer,
             sizeof(term->sb_buffer[0]) * (term->sb_current - 1));
 
   } else if (term->sb_current > 0) {
     // Make room at the start by shifting to the right.
     memmove(term->sb_buffer + 1, term->sb_buffer,
             sizeof(term->sb_buffer[0]) * term->sb_current);
   }
 
   if (!sbrow) {
     sbrow = malloc(sizeof(ScrollbackLine) + c * sizeof(sbrow->cells[0]));
     sbrow->cols = c;
     sbrow->info = NULL;
   }
   if (sbrow->info != NULL) {
     free_lineinfo(sbrow->info);
   }
   sbrow->info = term->lines[0];
   memmove(term->lines, term->lines + 1,
           sizeof(term->lines[0]) * (term->lines_len - 1));
   if (term->resizing) {
     /* pushed by window height decr */
     if (term->lines[term->lines_len - 1] != NULL) {
       /* do not need free here ,it is reused ,we just need set null */
       term->lines[term->lines_len - 1] = NULL;
     }
     term->lines_len--;
   } else {
     LineInfo *lastline = term->lines[term->lines_len - 1];
     if (lastline != NULL) {
       LineInfo *line = alloc_lineinfo();
       if (lastline->directory != NULL) {
         line->directory = malloc(1 + strlen(lastline->directory));
         strcpy(line->directory, lastline->directory);
       }
       term->lines[term->lines_len - 1] = line;
     }
   }
 
   // New row is added at the start of the storage buffer.
   term->sb_buffer[0] = sbrow;
   if (term->sb_current < term->sb_size) {
     term->sb_current++;
   }
 
   if (term->sb_pending < term->sb_size) {
     term->sb_pending++;
     /* when window height decreased */
     if (term->height_resize < 0 &&
         term->sb_pending_by_height_decr < -term->height_resize) {
       term->sb_pending_by_height_decr++;
     }
   }
 
   memcpy(sbrow->cells, cells, c * sizeof(cells[0]));
 
   return 1;
 }
 /// Scrollback pop handler (from pangoterm).
 ///
 /// @param cols
 /// @param cells  VTerm state to update.
 /// @param data   Term
 static int term_sb_pop(int cols, VTermScreenCell *cells, void *data) {
   Term *term = (Term *)data;
 
   if (!term->sb_current) {
     return 0;
   }
 
   if (term->sb_pending) {
     term->sb_pending--;
   }
 
   ScrollbackLine *sbrow = term->sb_buffer[0];
   term->sb_current--;
   // Forget the "popped" row by shifting the rest onto it.
   memmove(term->sb_buffer, term->sb_buffer + 1,
           sizeof(term->sb_buffer[0]) * (term->sb_current));
 
   size_t cols_to_copy = (size_t)cols;
   if (cols_to_copy > sbrow->cols) {
     cols_to_copy = sbrow->cols;
   }
 
   // copy to vterm state
   memcpy(cells, sbrow->cells, sizeof(cells[0]) * cols_to_copy);
   size_t col;
   for (col = cols_to_copy; col < (size_t)cols; col++) {
     cells[col].chars[0] = 0;
     cells[col].width = 1;
   }
 
   LineInfo **lines = malloc(sizeof(LineInfo *) * (term->lines_len + 1));
 
   memmove(lines + 1, term->lines, sizeof(term->lines[0]) * term->lines_len);
   lines[0] = sbrow->info;
   free(sbrow);
   term->lines_len += 1;
   free(term->lines);
   term->lines = lines;
 
   return 1;
 }
 
 static int term_sb_clear(void *data) {
   Term *term = (Term *)data;
 
   if (term->sb_clear_pending) {
     // Another scrollback clear is already pending, so skip this one.
     return 0;
   }
 
   for (int i = 0; i < term->sb_current; i++) {
     if (term->sb_buffer[i]->info != NULL) {
       free_lineinfo(term->sb_buffer[i]->info);
       term->sb_buffer[i]->info = NULL;
     }
     free(term->sb_buffer[i]);
   }
   free(term->sb_buffer);
   term->sb_buffer = malloc(sizeof(ScrollbackLine *) * term->sb_size);
   term->sb_clear_pending = true;
   term->sb_current = 0;
   term->sb_pending = 0;
   term->sb_pending_by_height_decr = 0;
   invalidate_terminal(term, -1, -1);
 
   return 0;
 }
 
 static int row_to_linenr(Term *term, int row) {
   return row != INT_MAX ? row + (int)term->sb_current + 1 : INT_MAX;
 }
 
 static int linenr_to_row(Term *term, int linenr) {
   return linenr - (int)term->sb_current - 1;
 }
 
 static void fetch_cell(Term *term, int row, int col, VTermScreenCell *cell) {
   if (row < 0) {
     ScrollbackLine *sbrow = term->sb_buffer[-row - 1];
     if ((size_t)col < sbrow->cols) {
       *cell = sbrow->cells[col];
     } else {
       // fill the pointer with an empty cell
       VTermColor fg, bg;
       VTermState *state = vterm_obtain_state(term->vt);
       vterm_state_get_default_colors(state, &fg, &bg);
 
       *cell = (VTermScreenCell){.chars = {0}, .width = 1, .bg = bg};
     }
   } else {
     vterm_screen_get_cell(term->vts, (VTermPos){.row = row, .col = col}, cell);
   }
 }
 
 static char *get_row_directory(Term *term, int row) {
   if (row < 0) {
     ScrollbackLine *sbrow = term->sb_buffer[-row - 1];
     return sbrow->info->directory;
     /* return term->dirs[0]; */
   } else {
     LineInfo *line = term->lines[row];
     return line ? line->directory : NULL;
   }
 }
 static LineInfo *get_lineinfo(Term *term, int row) {
   if (row < 0) {
     ScrollbackLine *sbrow = term->sb_buffer[-row - 1];
     return sbrow->info;
     /* return term->dirs[0]; */
   } else {
     return term->lines[row];
   }
 }
 static bool is_eol(Term *term, int end_col, int row, int col) {
   /* This cell is EOL if this and every cell to the right is black */
   if (row >= 0) {
     VTermPos pos = {.row = row, .col = col};
     return vterm_screen_is_eol(term->vts, pos);
   }
 
   ScrollbackLine *sbrow = term->sb_buffer[-row - 1];
   int c;
   for (c = col; c < end_col && c < sbrow->cols;) {
     if (sbrow->cells[c].chars[0]) {
       return 0;
     }
     c += sbrow->cells[c].width;
   }
   return 1;
 }
 static int is_end_of_prompt(Term *term, int end_col, int row, int col) {
   LineInfo *info = get_lineinfo(term, row);
   if (info == NULL) {
     return 0;
   }
   if (info->prompt_col < 0) {
     return 0;
   }
   if (info->prompt_col == col) {
     return 1;
   }
   if (is_eol(term, end_col, row, col) && info->prompt_col >= col) {
     return 1;
   }
   return 0;
 }
 
 static void goto_col(Term *term, emacs_env *env, int row, int end_col) {
   int col = 0;
   size_t offset = 0;
   size_t beyond_eol = 0;
 
   int height;
   int width;
   vterm_get_size(term->vt, &height, &width);
 
   while (col < end_col) {
     VTermScreenCell cell;
     fetch_cell(term, row, col, &cell);
     if (cell.chars[0]) {
       if (cell.width > 1) {
         offset += cell.width - 1;
       }
     } else {
       if (is_eol(term, term->width, row, col)) {
         offset += cell.width;
         beyond_eol += cell.width;
       }
     }
     col += cell.width;
   }
 
   forward_char(env, env->make_integer(env, end_col - offset));
   emacs_value space = env->make_string(env, " ", 1);
   for (int i = 0; i < beyond_eol; i += 1)
     insert(env, space);
 }
 
 static void refresh_lines(Term *term, emacs_env *env, int start_row,
                           int end_row, int end_col) {
   if (end_row < start_row) {
     return;
   }
   int i, j;
 
 #define PUSH_BUFFER(c)                                                         \
   do {                                                                         \
     if (length == capacity) {                                                  \
       capacity += end_col * 4;                                                 \
       buffer = realloc(buffer, capacity * sizeof(char));                       \
     }                                                                          \
     buffer[length] = (c);                                                      \
     length++;                                                                  \
   } while (0)
 
   int capacity = ((end_row - start_row + 1) * end_col) * 4;
   int length = 0;
   char *buffer = malloc(capacity * sizeof(char));
   VTermScreenCell cell;
   VTermScreenCell lastCell;
   fetch_cell(term, start_row, 0, &lastCell);
 
   for (i = start_row; i < end_row; i++) {
 
     int newline = 0;
     int isprompt = 0;
     for (j = 0; j < end_col; j++) {
       fetch_cell(term, i, j, &cell);
       if (isprompt && length > 0) {
         emacs_value text = render_text(env, term, buffer, length, &lastCell);
         insert(env, render_prompt(env, text));
         length = 0;
       }
 
       isprompt = is_end_of_prompt(term, end_col, i, j);
       if (isprompt && length > 0) {
         insert(env, render_text(env, term, buffer, length, &lastCell));
         length = 0;
       }
 
       if (!compare_cells(&cell, &lastCell)) {
         emacs_value text = render_text(env, term, buffer, length, &lastCell);
         insert(env, text);
         length = 0;
       }
 
       lastCell = cell;
       if (cell.chars[0] == 0) {
         if (is_eol(term, end_col, i, j)) {
           /* This cell is EOL if this and every cell to the right is black */
           PUSH_BUFFER('\n');
           newline = 1;
           break;
         }
         PUSH_BUFFER(' ');
       } else {
         for (int k = 0; k < VTERM_MAX_CHARS_PER_CELL && cell.chars[k]; ++k) {
           unsigned char bytes[4];
           size_t count = codepoint_to_utf8(cell.chars[k], bytes);
           for (int l = 0; l < count; l++) {
             PUSH_BUFFER(bytes[l]);
           }
         }
       }
 
       if (cell.width > 1) {
         int w = cell.width - 1;
         j = j + w;
       }
     }
     if (isprompt && length > 0) {
       emacs_value text = render_text(env, term, buffer, length, &lastCell);
       insert(env, render_prompt(env, text));
       length = 0;
       isprompt = 0;
     }
 
     if (!newline) {
       emacs_value text = render_text(env, term, buffer, length, &lastCell);
       insert(env, text);
       length = 0;
       text = render_fake_newline(env, term);
       insert(env, text);
     }
   }
   emacs_value text = render_text(env, term, buffer, length, &lastCell);
   insert(env, text);
 
 #undef PUSH_BUFFER
   free(buffer);
 
   return;
 }
 // Refresh the screen (visible part of the buffer when the terminal is
 // focused) of a invalidated terminal
 static void refresh_screen(Term *term, emacs_env *env) {
   // Term height may have decreased before `invalid_end` reflects it.
   term->invalid_end = MIN(term->invalid_end, term->height);
 
   if (term->invalid_end >= term->invalid_start) {
     int startrow = -(term->height - term->invalid_start - term->linenum_added);
     /* startrow is negative,so we backward  -startrow lines from end of buffer
        then delete lines there.
      */
     goto_line(env, startrow);
     delete_lines(env, startrow, term->invalid_end - term->invalid_start, true);
     refresh_lines(term, env, term->invalid_start, term->invalid_end,
                   term->width);
 
     /* term->linenum_added is lines added  by window height increased */
     term->linenum += term->linenum_added;
     term->linenum_added = 0;
   }
 
   term->invalid_start = INT_MAX;
   term->invalid_end = -1;
 }
 
 static int term_resize(int rows, int cols, void *user_data) {
   /* can not use invalidate_terminal here */
   /* when the window height decreased, */
   /*  the value of term->invalid_end can't bigger than window height */
   Term *term = (Term *)user_data;
   term->invalid_start = 0;
   term->invalid_end = rows;
 
   /* if rows=term->lines_len, that means term_sb_pop already resize term->lines
    */
   /* if rows<term->lines_len, term_sb_push would resize term->lines there */
   /* we noly need to take care of rows>term->height */
 
   if (rows > term->height) {
     if (rows > term->lines_len) {
       LineInfo **infos = term->lines;
       term->lines = malloc(sizeof(LineInfo *) * rows);
       memmove(term->lines, infos, sizeof(infos[0]) * term->lines_len);
 
       LineInfo *lastline = term->lines[term->lines_len - 1];
       for (int i = term->lines_len; i < rows; i++) {
         if (lastline != NULL) {
           LineInfo *line = alloc_lineinfo();
           if (lastline->directory != NULL) {
             line->directory =
                 malloc(1 + strlen(term->lines[term->lines_len - 1]->directory));
             strcpy(line->directory,
                    term->lines[term->lines_len - 1]->directory);
           }
           term->lines[i] = line;
         } else {
           term->lines[i] = NULL;
         }
       }
       term->lines_len = rows;
       free(infos);
     }
   }
 
   term->width = cols;
   term->height = rows;
 
   invalidate_terminal(term, -1, -1);
   term->resizing = false;
 
   return 1;
 }
 
 // Refresh the scrollback of an invalidated terminal.
 static void refresh_scrollback(Term *term, emacs_env *env) {
   int max_line_count = (int)term->sb_current + term->height;
   int del_cnt = 0;
   if (term->sb_clear_pending) {
     del_cnt = term->linenum - term->height;
     if (del_cnt > 0) {
       delete_lines(env, 1, del_cnt, true);
       term->linenum -= del_cnt;
     }
     term->sb_clear_pending = false;
   }
   if (term->sb_pending > 0) {
     // This means that either the window height has decreased or the screen
     // became full and libvterm had to push all rows up. Convert the first
     // pending scrollback row into a string and append it just above the visible
     // section of the buffer
 
     del_cnt = term->linenum - term->height - (int)term->sb_size +
               term->sb_pending - term->sb_pending_by_height_decr;
     if (del_cnt > 0) {
       delete_lines(env, 1, del_cnt, true);
       term->linenum -= del_cnt;
     }
 
     term->linenum += term->sb_pending;
     del_cnt = term->linenum - max_line_count; /* extra lines at the bottom */
     /* buf_index is negative,so we move to end of buffer,then backward
        -buf_index lines. goto lines backward is effectively when
        vterm-max-scrollback is a large number.
      */
     int buf_index = -(term->height + del_cnt);
     goto_line(env, buf_index);
     refresh_lines(term, env, -term->sb_pending, 0, term->width);
 
     term->sb_pending = 0;
   }
 
   // Remove extra lines at the bottom
   del_cnt = term->linenum - max_line_count;
   if (del_cnt > 0) {
     term->linenum -= del_cnt;
     /* -del_cnt is negative,so we delete_lines from end of buffer.
        this line means: delete del_cnt count of lines at end of buffer.
      */
     delete_lines(env, -del_cnt, del_cnt, true);
   }
 
   term->sb_pending_by_height_decr = 0;
   term->height_resize = 0;
 }
 
 static void adjust_topline(Term *term, emacs_env *env) {
   VTermState *state = vterm_obtain_state(term->vt);
   VTermPos pos;
   vterm_state_get_cursorpos(state, &pos);
 
   /* pos.row-term->height is negative,so we backward term->height-pos.row
    * lines from end of buffer
    */
 
   goto_line(env, pos.row - term->height);
   goto_col(term, env, pos.row, pos.col);
 
   emacs_value windows = get_buffer_window_list(env);
   emacs_value swindow = selected_window(env);
   int winnum = env->extract_integer(env, length(env, windows));
   for (int i = 0; i < winnum; i++) {
     emacs_value window = nth(env, i, windows);
     if (eq(env, window, swindow)) {
       int win_body_height =
           env->extract_integer(env, window_body_height(env, window));
 
       /* recenter:If ARG is negative, it counts up from the bottom of the
        * window.  (ARG should be less than the height of the window ) */
       if (term->height - pos.row <= win_body_height) {
         recenter(env, env->make_integer(env, pos.row - term->height));
       } else {
         recenter(env, env->make_integer(env, pos.row));
       }
     } else {
       if (env->is_not_nil(env, window)) {
         set_window_point(env, window, point(env));
       }
     }
   }
 }
 
 static void invalidate_terminal(Term *term, int start_row, int end_row) {
   if (start_row != -1 && end_row != -1) {
     term->invalid_start = MIN(term->invalid_start, start_row);
     term->invalid_end = MAX(term->invalid_end, end_row);
   }
   term->is_invalidated = true;
 }
 
 static int term_damage(VTermRect rect, void *data) {
   invalidate_terminal(data, rect.start_row, rect.end_row);
   return 1;
 }
 
 static int term_moverect(VTermRect dest, VTermRect src, void *data) {
   invalidate_terminal(data, MIN(dest.start_row, src.start_row),
                       MAX(dest.end_row, src.end_row));
   return 1;
 }
 
 static int term_movecursor(VTermPos new, VTermPos old, int visible,
                            void *data) {
   Term *term = data;
   term->cursor.row = new.row;
   term->cursor.col = new.col;
   invalidate_terminal(term, old.row, old.row + 1);
   invalidate_terminal(term, new.row, new.row + 1);
 
   return 1;
 }
 
 static void term_redraw_cursor(Term *term, emacs_env *env) {
   if (term->cursor.cursor_blink_changed) {
     term->cursor.cursor_blink_changed = false;
     set_cursor_blink(env, term->cursor.cursor_blink);
   }
 
   if (term->cursor.cursor_type_changed) {
     term->cursor.cursor_type_changed = false;
 
     if (!term->cursor.cursor_visible) {
       set_cursor_type(env, Qnil);
       return;
     }
 
     switch (term->cursor.cursor_type) {
     case VTERM_PROP_CURSORSHAPE_BLOCK:
       set_cursor_type(env, Qbox);
       break;
     case VTERM_PROP_CURSORSHAPE_UNDERLINE:
       set_cursor_type(env, Qhbar);
       break;
     case VTERM_PROP_CURSORSHAPE_BAR_LEFT:
       set_cursor_type(env, Qbar);
       break;
     default:
       set_cursor_type(env, Qt);
       break;
     }
   }
 }
 
 static void term_redraw(Term *term, emacs_env *env) {
   term_redraw_cursor(term, env);
 
   if (term->is_invalidated) {
     int oldlinenum = term->linenum;
     refresh_scrollback(term, env);
     refresh_screen(term, env);
     term->linenum_added = term->linenum - oldlinenum;
     adjust_topline(term, env);
     term->linenum_added = 0;
   }
 
   if (term->title_changed) {
     set_title(env, env->make_string(env, term->title, strlen(term->title)));
     term->title_changed = false;
   }
 
   if (term->directory_changed) {
     set_directory(
         env, env->make_string(env, term->directory, strlen(term->directory)));
     term->directory_changed = false;
   }
 
   while (term->elisp_code_first) {
     ElispCodeListNode *node = term->elisp_code_first;
     term->elisp_code_first = node->next;
     emacs_value elisp_code = env->make_string(env, node->code, node->code_len);
     vterm_eval(env, elisp_code);
 
     free(node->code);
     free(node);
   }
   term->elisp_code_p_insert = &term->elisp_code_first;
 
   if (term->selection_data) {
     emacs_value selection_mask = env->make_integer(env, term->selection_mask);
     emacs_value selection_data = env->make_string(env, term->selection_data,
                                                   strlen(term->selection_data));
     vterm_set_selection(env, selection_mask, selection_data);
     free(term->selection_data);
     term->selection_data = NULL;
     term->selection_mask = 0;
   }
 
   term->is_invalidated = false;
 }
 
 static VTermScreenCallbacks vterm_screen_callbacks = {
     .damage = term_damage,
     .moverect = term_moverect,
     .movecursor = term_movecursor,
     .settermprop = term_settermprop,
     .resize = term_resize,
     .sb_pushline = term_sb_push,
     .sb_popline = term_sb_pop,
 #if !defined(VTermSBClearNotExists)
     .sb_clear = term_sb_clear,
 #endif
 };
 
 static bool compare_cells(VTermScreenCell *a, VTermScreenCell *b) {
   bool equal = true;
   equal = equal && vterm_color_is_equal(&a->fg, &b->fg);
   equal = equal && vterm_color_is_equal(&a->bg, &b->bg);
   equal = equal && (a->attrs.bold == b->attrs.bold);
   equal = equal && (a->attrs.underline == b->attrs.underline);
   equal = equal && (a->attrs.italic == b->attrs.italic);
   equal = equal && (a->attrs.reverse == b->attrs.reverse);
   equal = equal && (a->attrs.strike == b->attrs.strike);
   return equal;
 }
 
 static bool is_key(unsigned char *key, size_t len, char *key_description) {
   return (len == strlen(key_description) &&
           memcmp(key, key_description, len) == 0);
 }
 
 /* str1=concat(str1,str2,str2_len,true); */
 /* str1 can be NULL */
 static char *concat(char *str1, const char *str2, size_t str2_len,
                     bool free_str1) {
   if (str1 == NULL) {
     str1 = malloc(str2_len + 1);
     memcpy(str1, str2, str2_len);
     str1[str2_len] = '\0';
     return str1;
   }
   size_t str1_len = strlen(str1);
   char *buf = malloc(str1_len + str2_len + 1);
   memcpy(buf, str1, str1_len);
   memcpy(&buf[str1_len], str2, str2_len);
   buf[str1_len + str2_len] = '\0';
   if (free_str1) {
     free(str1);
   }
   return buf;
 }
 static void term_set_title(Term *term, const char *title, size_t len,
                            bool initial, bool final) {
   if (term->title && initial) {
     free(term->title);
     term->title = NULL;
     term->title_changed = false;
   }
   term->title = concat(term->title, title, len, true);
   if (final) {
     term->title_changed = true;
   }
   return;
 }
 
 static int term_settermprop(VTermProp prop, VTermValue *val, void *user_data) {
   Term *term = (Term *)user_data;
   switch (prop) {
   case VTERM_PROP_CURSORVISIBLE:
     invalidate_terminal(term, term->cursor.row, term->cursor.row + 1);
     term->cursor.cursor_visible = val->boolean;
     term->cursor.cursor_type_changed = true;
     break;
   case VTERM_PROP_CURSORBLINK:
     if (term->ignore_blink_cursor)
       break;
     invalidate_terminal(term, term->cursor.row, term->cursor.row + 1);
     term->cursor.cursor_blink = val->boolean;
     term->cursor.cursor_blink_changed = true;
     break;
   case VTERM_PROP_CURSORSHAPE:
     invalidate_terminal(term, term->cursor.row, term->cursor.row + 1);
     term->cursor.cursor_type = val->number;
     term->cursor.cursor_type_changed = true;
     break;
   case VTERM_PROP_TITLE:
 #ifdef VTermStringFragmentNotExists
     term_set_title(term, val->string, strlen(val->string), true, true);
 #else
     term_set_title(term, val->string.str, val->string.len, val->string.initial,
                    val->string.final);
 #endif
     break;
   case VTERM_PROP_ALTSCREEN:
     invalidate_terminal(term, 0, term->height);
     break;
   default:
     return 0;
   }
 
   return 1;
 }
 
 static emacs_value render_text(emacs_env *env, Term *term, char *buffer,
                                int len, VTermScreenCell *cell) {
   emacs_value text;
   if (len == 0) {
     text = env->make_string(env, "", 0);
     return text;
   } else {
     text = env->make_string(env, buffer, len);
   }
 
   emacs_value fg = cell_rgb_color(env, term, cell, true);
   emacs_value bg = cell_rgb_color(env, term, cell, false);
   /* With vterm-disable-bold-font, vterm-disable-underline,
    * vterm-disable-inverse-video, users can disable some text properties.
    * Here, we check whether the text would require adding such properties.
    * In case it does, and the user does not disable the attribute, we later
    * append the property to the list props.  If the text does not require
    * such property, or the user disable it, we set the variable to nil.
    * Properties that are marked as nil are not added to the text. */
   emacs_value bold =
       cell->attrs.bold && !term->disable_bold_font ? Qbold : Qnil;
   emacs_value underline =
       cell->attrs.underline && !term->disable_underline ? Qt : Qnil;
   emacs_value italic = cell->attrs.italic ? Qitalic : Qnil;
   emacs_value reverse =
       cell->attrs.reverse && !term->disable_inverse_video ? Qt : Qnil;
   emacs_value strike = cell->attrs.strike ? Qt : Qnil;
 
   // TODO: Blink, font, dwl, dhl is missing
   int emacs_major_version =
       env->extract_integer(env, symbol_value(env, Qemacs_major_version));
   emacs_value properties;
   emacs_value props[64];
   int props_len = 0;
   if (env->is_not_nil(env, fg))
     props[props_len++] = Qforeground, props[props_len++] = fg;
   if (env->is_not_nil(env, bg))
     props[props_len++] = Qbackground, props[props_len++] = bg;
   if (bold != Qnil)
     props[props_len++] = Qweight, props[props_len++] = bold;
   if (underline != Qnil)
     props[props_len++] = Qunderline, props[props_len++] = underline;
   if (italic != Qnil)
     props[props_len++] = Qslant, props[props_len++] = italic;
   if (reverse != Qnil)
     props[props_len++] = Qreverse, props[props_len++] = reverse;
   if (strike != Qnil)
     props[props_len++] = Qstrike, props[props_len++] = strike;
   if (emacs_major_version >= 27)
     props[props_len++] = Qextend, props[props_len++] = Qt;
 
   properties = list(env, props, props_len);
 
   if (props_len)
     put_text_property(env, text, Qface, properties);
 
   return text;
 }
 static emacs_value render_prompt(emacs_env *env, emacs_value text) {
 
   emacs_value properties;
 
   properties =
       list(env, (emacs_value[]){Qvterm_prompt, Qt, Qrear_nonsticky, Qt}, 4);
 
   add_text_properties(env, text, properties);
 
   return text;
 }
 
 static emacs_value render_fake_newline(emacs_env *env, Term *term) {
 
   emacs_value text;
   text = env->make_string(env, "\n", 1);
 
   emacs_value properties;
 
   properties =
       list(env, (emacs_value[]){Qvterm_line_wrap, Qt, Qrear_nonsticky, Qt}, 4);
 
   add_text_properties(env, text, properties);
 
   return text;
 }
 
 static emacs_value cell_rgb_color(emacs_env *env, Term *term,
                                   VTermScreenCell *cell, bool is_foreground) {
   VTermColor *color = is_foreground ? &cell->fg : &cell->bg;
 
   /** NOTE: -10 is used as index offset for special indexes,
    * see C-h f vterm--get-color RET
    */
   if (VTERM_COLOR_IS_DEFAULT_FG(color)) {
     return vterm_get_color(env, -1 + (cell->attrs.underline ? -10 : 0));
   }
   if (VTERM_COLOR_IS_DEFAULT_BG(color)) {
     return vterm_get_color(env, -2 + (cell->attrs.reverse ? -10 : 0));
   }
   if (VTERM_COLOR_IS_INDEXED(color)) {
     if (color->indexed.idx < 16) {
       return vterm_get_color(env, color->indexed.idx);
     } else {
       VTermState *state = vterm_obtain_state(term->vt);
       vterm_state_get_palette_color(state, color->indexed.idx, color);
     }
   } else if (VTERM_COLOR_IS_RGB(color)) {
     /* do nothing just use the argument color directly */
   }
 
   char buffer[8];
   snprintf(buffer, 8, "#%02X%02X%02X", color->rgb.red, color->rgb.green,
            color->rgb.blue);
   return env->make_string(env, buffer, 7);
 }
 
 static void term_flush_output(Term *term, emacs_env *env) {
   size_t len = vterm_output_get_buffer_current(term->vt);
   if (len) {
     char buffer[len];
     len = vterm_output_read(term->vt, buffer, len);
 
     emacs_value output = env->make_string(env, buffer, len);
     env->funcall(env, Fvterm_flush_output, 1, (emacs_value[]){output});
   }
 }
 
 static void term_clear_scrollback(Term *term, emacs_env *env) {
   term_sb_clear(term);
   vterm_screen_flush_damage(term->vts);
   term_redraw(term, env);
 }
 
 static void term_process_key(Term *term, emacs_env *env, unsigned char *key,
                              size_t len, VTermModifier modifier) {
   if (is_key(key, len, "<clear_scrollback>")) {
     term_clear_scrollback(term, env);
   } else if (is_key(key, len, "<start>")) {
     tcflow(term->pty_fd, TCOON);
   } else if (is_key(key, len, "<stop>")) {
     tcflow(term->pty_fd, TCOOFF);
   } else if (is_key(key, len, "<start_paste>")) {
     vterm_keyboard_start_paste(term->vt);
   } else if (is_key(key, len, "<end_paste>")) {
     vterm_keyboard_end_paste(term->vt);
   } else if (is_key(key, len, "<tab>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_TAB, modifier);
   } else if (is_key(key, len, "<backtab>") ||
              is_key(key, len, "<iso-lefttab>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_TAB, VTERM_MOD_SHIFT);
   } else if (is_key(key, len, "<backspace>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_BACKSPACE, modifier);
   } else if (is_key(key, len, "<escape>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_ESCAPE, modifier);
   } else if (is_key(key, len, "<up>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_UP, modifier);
   } else if (is_key(key, len, "<down>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_DOWN, modifier);
   } else if (is_key(key, len, "<left>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_LEFT, modifier);
   } else if (is_key(key, len, "<right>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_RIGHT, modifier);
   } else if (is_key(key, len, "<insert>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_INS, modifier);
   } else if (is_key(key, len, "<delete>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_DEL, modifier);
   } else if (is_key(key, len, "<home>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_HOME, modifier);
   } else if (is_key(key, len, "<end>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_END, modifier);
   } else if (is_key(key, len, "<prior>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_PAGEUP, modifier);
   } else if (is_key(key, len, "<next>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_PAGEDOWN, modifier);
   } else if (is_key(key, len, "<f0>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(0), modifier);
   } else if (is_key(key, len, "<f1>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(1), modifier);
   } else if (is_key(key, len, "<f2>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(2), modifier);
   } else if (is_key(key, len, "<f3>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(3), modifier);
   } else if (is_key(key, len, "<f4>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(4), modifier);
   } else if (is_key(key, len, "<f5>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(5), modifier);
   } else if (is_key(key, len, "<f6>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(6), modifier);
   } else if (is_key(key, len, "<f7>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(7), modifier);
   } else if (is_key(key, len, "<f8>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(8), modifier);
   } else if (is_key(key, len, "<f9>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(9), modifier);
   } else if (is_key(key, len, "<f10>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(10), modifier);
   } else if (is_key(key, len, "<f11>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(11), modifier);
   } else if (is_key(key, len, "<f12>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_FUNCTION(12), modifier);
   } else if (is_key(key, len, "<kp-0>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_0, modifier);
   } else if (is_key(key, len, "<kp-1>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_1, modifier);
   } else if (is_key(key, len, "<kp-2>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_2, modifier);
   } else if (is_key(key, len, "<kp-3>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_3, modifier);
   } else if (is_key(key, len, "<kp-4>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_4, modifier);
   } else if (is_key(key, len, "<kp-5>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_5, modifier);
   } else if (is_key(key, len, "<kp-6>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_6, modifier);
   } else if (is_key(key, len, "<kp-7>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_7, modifier);
   } else if (is_key(key, len, "<kp-8>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_8, modifier);
   } else if (is_key(key, len, "<kp-9>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_9, modifier);
   } else if (is_key(key, len, "<kp-add>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_PLUS, modifier);
   } else if (is_key(key, len, "<kp-subtract>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_MINUS, modifier);
   } else if (is_key(key, len, "<kp-multiply>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_MULT, modifier);
   } else if (is_key(key, len, "<kp-divide>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_DIVIDE, modifier);
   } else if (is_key(key, len, "<kp-equal>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_EQUAL, modifier);
   } else if (is_key(key, len, "<kp-decimal>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_PERIOD, modifier);
   } else if (is_key(key, len, "<kp-separator>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_COMMA, modifier);
   } else if (is_key(key, len, "<kp-enter>")) {
     vterm_keyboard_key(term->vt, VTERM_KEY_KP_ENTER, modifier);
   } else if (is_key(key, len, "j") && (modifier == VTERM_MOD_CTRL)) {
     vterm_keyboard_unichar(term->vt, '\n', 0);
   } else if (is_key(key, len, "SPC")) {
     vterm_keyboard_unichar(term->vt, ' ', modifier);
   } else if (len <= 4) {
     uint32_t codepoint;
     if (utf8_to_codepoint(key, len, &codepoint)) {
       vterm_keyboard_unichar(term->vt, codepoint, modifier);
     }
   }
 }
 
 void term_finalize(void *object) {
   Term *term = (Term *)object;
   for (int i = 0; i < term->sb_current; i++) {
     if (term->sb_buffer[i]->info != NULL) {
       free_lineinfo(term->sb_buffer[i]->info);
       term->sb_buffer[i]->info = NULL;
     }
     free(term->sb_buffer[i]);
   }
   if (term->title) {
     free(term->title);
     term->title = NULL;
   }
 
   if (term->directory) {
     free(term->directory);
     term->directory = NULL;
   }
 
   while (term->elisp_code_first) {
     ElispCodeListNode *node = term->elisp_code_first;
     term->elisp_code_first = node->next;
     free(node->code);
     free(node);
   }
   term->elisp_code_p_insert = &term->elisp_code_first;
 
   if (term->cmd_buffer) {
     free(term->cmd_buffer);
     term->cmd_buffer = NULL;
   }
   if (term->selection_data) {
     free(term->selection_data);
     term->selection_data = NULL;
   }
 
   for (int i = 0; i < term->lines_len; i++) {
     if (term->lines[i] != NULL) {
       free_lineinfo(term->lines[i]);
       term->lines[i] = NULL;
     }
   }
 
   if (term->pty_fd > 0) {
     close(term->pty_fd);
   }
 
   free(term->sb_buffer);
   free(term->lines);
   vterm_free(term->vt);
   free(term);
 }
 
 static int handle_osc_cmd_51(Term *term, char subCmd, char *buffer) {
   if (subCmd == 'A') {
     /* "51;A" sets the current directory */
     /* "51;A" has also the role of identifying the end of the prompt */
     if (term->directory != NULL) {
       free(term->directory);
       term->directory = NULL;
     }
     term->directory = malloc(strlen(buffer) + 1);
     strcpy(term->directory, buffer);
     term->directory_changed = true;
 
     for (int i = term->cursor.row; i < term->lines_len; i++) {
       if (term->lines[i] == NULL) {
         term->lines[i] = alloc_lineinfo();
       }
 
       if (term->lines[i]->directory != NULL) {
         free(term->lines[i]->directory);
       }
       term->lines[i]->directory = malloc(strlen(buffer) + 1);
       strcpy(term->lines[i]->directory, buffer);
       if (i == term->cursor.row) {
         term->lines[i]->prompt_col = term->cursor.col;
       } else {
         term->lines[i]->prompt_col = -1;
       }
     }
     return 1;
   } else if (subCmd == 'E') {
     /* "51;E" executes elisp code */
     /* The elisp code is executed in term_redraw */
     ElispCodeListNode *node = malloc(sizeof(ElispCodeListNode));
     node->code_len = strlen(buffer);
     node->code = malloc(node->code_len + 1);
     strcpy(node->code, buffer);
     node->next = NULL;
 
     *(term->elisp_code_p_insert) = node;
     term->elisp_code_p_insert = &(node->next);
     return 1;
   }
   return 0;
 }
 
 static int handle_osc_cmd(Term *term, int cmd, char *buffer) {
   if (cmd == 51) {
     char subCmd = '0';
     if (strlen(buffer) == 0) {
       return 0;
     }
     subCmd = buffer[0];
     /* ++ skip the subcmd char */
     return handle_osc_cmd_51(term, subCmd, ++buffer);
   }
   return 0;
 }
 /* maybe we should drop support of libvterm < v0.2 */
 /* VTermStringFragmentNotExists was introduced when libvterm is not released */
 #ifdef VTermStringFragmentNotExists
 static int osc_callback(const char *command, size_t cmdlen, void *user) {
   Term *term = (Term *)user;
   char buffer[cmdlen + 1];
   buffer[cmdlen] = '\0';
   memcpy(buffer, command, cmdlen);
 
   if (cmdlen > 4 && buffer[0] == '5' && buffer[1] == '1' && buffer[2] == ';' &&
       buffer[3] == 'A') {
     return handle_osc_cmd_51(term, 'A', &buffer[4]);
   } else if (cmdlen > 4 && buffer[0] == '5' && buffer[1] == '1' &&
              buffer[2] == ';' && buffer[3] == 'E') {
     return handle_osc_cmd_51(term, 'E', &buffer[4]);
   }
   return 0;
 }
 static VTermParserCallbacks parser_callbacks = {
     .text = NULL,
     .control = NULL,
     .escape = NULL,
     .csi = NULL,
     .osc = &osc_callback,
     .dcs = NULL,
 };
 #else
 
 static int osc_callback(int cmd, VTermStringFragment frag, void *user) {
   /* osc_callback (OSC = Operating System Command) */
 
   /* We interpret escape codes that start with "51;" */
   /* "51;A" sets the current directory */
   /* "51;A" has also the role of identifying the end of the prompt */
   /* "51;E" executes elisp code */
   /* The elisp code is executed in term_redraw */
   Term *term = (Term *)user;
 
   if (frag.initial) {
     /* drop old fragment,because this is a initial fragment */
     if (term->cmd_buffer) {
       free(term->cmd_buffer);
       term->cmd_buffer = NULL;
     }
   }
 
   if (!frag.initial && !frag.final && frag.len == 0) {
     return 0;
   }
 
   term->cmd_buffer = concat(term->cmd_buffer, frag.str, frag.len, true);
   if (frag.final) {
     handle_osc_cmd(term, cmd, term->cmd_buffer);
     free(term->cmd_buffer);
     term->cmd_buffer = NULL;
   }
   return 0;
 }
 static VTermStateFallbacks parser_callbacks = {
     .control = NULL,
     .csi = NULL,
     .osc = &osc_callback,
     .dcs = NULL,
 };
 #ifndef VTermSelectionMaskNotExists
 static int set_selection(VTermSelectionMask mask, VTermStringFragment frag,
                          void *user) {
   Term *term = (Term *)user;
 
   if (frag.initial) {
     term->selection_mask = mask;
     if (term->selection_data) {
       free(term->selection_data);
     }
     term->selection_data = NULL;
   }
 
   if (frag.len) {
     term->selection_data =
         concat(term->selection_data, frag.str, frag.len, true);
   }
   return 1;
 }
 /* OSC 52 ; Pc ; Pd BEL */
 /* Manipulate Selection Data */
 /* https://invisible-island.net/xterm/ctlseqs/ctlseqs.html */
 /* test by printf "\033]52;c;$(printf "%s" "blabla" | base64)\a" */
 /* c , p , q , s , 0 , 1 , 2 , 3 , 4 , 5 , 6 , and 7 */
 /* for clipboard, primary, secondary, select, or cut buffers 0 through 7 */
 /* respectively */
 static VTermSelectionCallbacks selection_callbacks = {
     .set = &set_selection,
     .query = NULL,
 };
 #endif /* VTermSelectionMaskNotExists */
 
 #endif
 
 emacs_value Fvterm_new(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
                        void *data) {
   Term *term = malloc(sizeof(Term));
 
   int rows = env->extract_integer(env, args[0]);
   int cols = env->extract_integer(env, args[1]);
   int sb_size = env->extract_integer(env, args[2]);
   int disable_bold_font = env->is_not_nil(env, args[3]);
   int disable_underline = env->is_not_nil(env, args[4]);
   int disable_inverse_video = env->is_not_nil(env, args[5]);
   int ignore_blink_cursor = env->is_not_nil(env, args[6]);
   int set_bold_hightbright = env->is_not_nil(env, args[7]);
 
   term->vt = vterm_new(rows, cols);
   vterm_set_utf8(term->vt, 1);
 
   term->vts = vterm_obtain_screen(term->vt);
 
   VTermState *state = vterm_obtain_state(term->vt);
   vterm_state_set_unrecognised_fallbacks(state, &parser_callbacks, term);
 
 #ifndef VTermSelectionMaskNotExists
   vterm_state_set_selection_callbacks(state, &selection_callbacks, term,
                                       term->selection_buf, SELECTION_BUF_LEN);
 #endif
   vterm_state_set_bold_highbright(state, set_bold_hightbright);
 
   vterm_screen_reset(term->vts, 1);
   vterm_screen_set_callbacks(term->vts, &vterm_screen_callbacks, term);
   vterm_screen_set_damage_merge(term->vts, VTERM_DAMAGE_SCROLL);
   vterm_screen_enable_altscreen(term->vts, true);
   term->sb_size = MIN(SB_MAX, sb_size);
   term->sb_current = 0;
   term->sb_pending = 0;
   term->sb_clear_pending = false;
   term->sb_pending_by_height_decr = 0;
   term->sb_buffer = malloc(sizeof(ScrollbackLine *) * term->sb_size);
   term->invalid_start = 0;
   term->invalid_end = rows;
   term->is_invalidated = false;
   term->width = cols;
   term->height = rows;
   term->height_resize = 0;
   term->disable_bold_font = disable_bold_font;
   term->disable_underline = disable_underline;
   term->disable_inverse_video = disable_inverse_video;
   term->ignore_blink_cursor = ignore_blink_cursor;
   emacs_value newline = env->make_string(env, "\n", 1);
   for (int i = 0; i < term->height; i++) {
     insert(env, newline);
   }
   term->linenum = term->height;
   term->linenum_added = 0;
   term->resizing = false;
 
   term->pty_fd = -1;
 
   term->title = NULL;
   term->title_changed = false;
 
   term->cursor.row = 0;
   term->cursor.col = 0;
   term->cursor.cursor_type = -1;
   term->cursor.cursor_visible = true;
   term->cursor.cursor_type_changed = false;
   term->cursor.cursor_blink = false;
   term->cursor.cursor_blink_changed = false;
   term->directory = NULL;
   term->directory_changed = false;
   term->elisp_code_first = NULL;
   term->elisp_code_p_insert = &term->elisp_code_first;
   term->selection_data = NULL;
   term->selection_mask = 0;
 
   term->cmd_buffer = NULL;
 
   term->lines = malloc(sizeof(LineInfo *) * rows);
   term->lines_len = rows;
   for (int i = 0; i < rows; i++) {
     term->lines[i] = NULL;
   }
 
   return env->make_user_ptr(env, term_finalize, term);
 }
 
 emacs_value Fvterm_update(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
                           void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
 
   // Process keys
   if (nargs > 1) {
     ptrdiff_t len = string_bytes(env, args[1]);
     unsigned char key[len];
     env->copy_string_contents(env, args[1], (char *)key, &len);
     VTermModifier modifier = VTERM_MOD_NONE;
     if (nargs > 2 && env->is_not_nil(env, args[2]))
       modifier = modifier | VTERM_MOD_SHIFT;
     if (nargs > 3 && env->is_not_nil(env, args[3]))
       modifier = modifier | VTERM_MOD_ALT;
     if (nargs > 4 && env->is_not_nil(env, args[4]))
       modifier = modifier | VTERM_MOD_CTRL;
 
     // Ignore the final zero byte
     term_process_key(term, env, key, len - 1, modifier);
   }
 
   // Flush output
   term_flush_output(term, env);
   if (term->is_invalidated) {
     vterm_invalidate(env);
   }
 
   return env->make_integer(env, 0);
 }
 
 emacs_value Fvterm_redraw(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
                           void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
   term_redraw(term, env);
   return env->make_integer(env, 0);
 }
 
 emacs_value Fvterm_write_input(emacs_env *env, ptrdiff_t nargs,
                                emacs_value args[], void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
   ptrdiff_t len = string_bytes(env, args[1]);
   char bytes[len];
 
   env->copy_string_contents(env, args[1], bytes, &len);
 
   vterm_input_write(term->vt, bytes, len);
   vterm_screen_flush_damage(term->vts);
 
   return env->make_integer(env, 0);
 }
 
 emacs_value Fvterm_set_size(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
                             void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
   int rows = env->extract_integer(env, args[1]);
   int cols = env->extract_integer(env, args[2]);
 
   if (cols != term->width || rows != term->height) {
     term->height_resize = rows - term->height;
     if (rows > term->height) {
       if (rows - term->height > term->sb_current) {
         term->linenum_added = rows - term->height - term->sb_current;
       }
     }
     term->resizing = true;
     vterm_set_size(term->vt, rows, cols);
     vterm_screen_flush_damage(term->vts);
 
     term_redraw(term, env);
   }
 
   return Qnil;
 }
 
 emacs_value Fvterm_set_pty_name(emacs_env *env, ptrdiff_t nargs,
                                 emacs_value args[], void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
 
   if (nargs > 1) {
     ptrdiff_t len = string_bytes(env, args[1]);
     char filename[len];
 
     env->copy_string_contents(env, args[1], filename, &len);
 
     term->pty_fd = open(filename, O_RDONLY);
   }
   return Qnil;
 }
 emacs_value Fvterm_get_pwd(emacs_env *env, ptrdiff_t nargs, emacs_value args[],
                            void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
   int linenum = env->extract_integer(env, args[1]);
   int row = linenr_to_row(term, linenum);
   char *dir = get_row_directory(term, row);
 
   return dir ? env->make_string(env, dir, strlen(dir)) : Qnil;
 }
 
 emacs_value Fvterm_get_icrnl(emacs_env *env, ptrdiff_t nargs,
                              emacs_value args[], void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
 
   if (term->pty_fd > 0) {
     struct termios keys;
     tcgetattr(term->pty_fd, &keys);
 
     if (keys.c_iflag & ICRNL)
       return Qt;
     else
       return Qnil;
   }
   return Qnil;
 }
 
 emacs_value Fvterm_reset_cursor_point(emacs_env *env, ptrdiff_t nargs,
                                       emacs_value args[], void *data) {
   Term *term = env->get_user_ptr(env, args[0]);
   int line = row_to_linenr(term, term->cursor.row);
   goto_line(env, line);
   goto_col(term, env, term->cursor.row, term->cursor.col);
   return point(env);
 }
 
 int emacs_module_init(struct emacs_runtime *ert) {
   emacs_env *env = ert->get_environment(ert);
 
   // Symbols;
   Qt = env->make_global_ref(env, env->intern(env, "t"));
   Qnil = env->make_global_ref(env, env->intern(env, "nil"));
   Qnormal = env->make_global_ref(env, env->intern(env, "normal"));
   Qbold = env->make_global_ref(env, env->intern(env, "bold"));
   Qitalic = env->make_global_ref(env, env->intern(env, "italic"));
   Qforeground = env->make_global_ref(env, env->intern(env, ":foreground"));
   Qbackground = env->make_global_ref(env, env->intern(env, ":background"));
   Qweight = env->make_global_ref(env, env->intern(env, ":weight"));
   Qunderline = env->make_global_ref(env, env->intern(env, ":underline"));
   Qslant = env->make_global_ref(env, env->intern(env, ":slant"));
   Qreverse = env->make_global_ref(env, env->intern(env, ":inverse-video"));
   Qstrike = env->make_global_ref(env, env->intern(env, ":strike-through"));
   Qextend = env->make_global_ref(env, env->intern(env, ":extend"));
   Qemacs_major_version =
       env->make_global_ref(env, env->intern(env, "emacs-major-version"));
   Qvterm_line_wrap =
       env->make_global_ref(env, env->intern(env, "vterm-line-wrap"));
   Qrear_nonsticky =
       env->make_global_ref(env, env->intern(env, "rear-nonsticky"));
   Qvterm_prompt = env->make_global_ref(env, env->intern(env, "vterm-prompt"));
 
   Qface = env->make_global_ref(env, env->intern(env, "font-lock-face"));
   Qbox = env->make_global_ref(env, env->intern(env, "box"));
   Qbar = env->make_global_ref(env, env->intern(env, "bar"));
   Qhbar = env->make_global_ref(env, env->intern(env, "hbar"));
   Qcursor_type = env->make_global_ref(env, env->intern(env, "cursor-type"));
 
   // Functions
   Fblink_cursor_mode =
       env->make_global_ref(env, env->intern(env, "blink-cursor-mode"));
   Fsymbol_value = env->make_global_ref(env, env->intern(env, "symbol-value"));
   Flength = env->make_global_ref(env, env->intern(env, "length"));
   Flist = env->make_global_ref(env, env->intern(env, "list"));
   Fnth = env->make_global_ref(env, env->intern(env, "nth"));
   Ferase_buffer = env->make_global_ref(env, env->intern(env, "erase-buffer"));
   Finsert = env->make_global_ref(env, env->intern(env, "vterm--insert"));
   Fgoto_char = env->make_global_ref(env, env->intern(env, "goto-char"));
   Fput_text_property =
       env->make_global_ref(env, env->intern(env, "put-text-property"));
   Fadd_text_properties =
       env->make_global_ref(env, env->intern(env, "add-text-properties"));
   Fset = env->make_global_ref(env, env->intern(env, "set"));
   Fvterm_flush_output =
       env->make_global_ref(env, env->intern(env, "vterm--flush-output"));
   Fforward_line = env->make_global_ref(env, env->intern(env, "forward-line"));
   Fgoto_line = env->make_global_ref(env, env->intern(env, "vterm--goto-line"));
   Fdelete_lines =
       env->make_global_ref(env, env->intern(env, "vterm--delete-lines"));
   Frecenter = env->make_global_ref(env, env->intern(env, "recenter"));
   Fset_window_point =
       env->make_global_ref(env, env->intern(env, "set-window-point"));
   Fwindow_body_height =
       env->make_global_ref(env, env->intern(env, "window-body-height"));
 
   Fpoint = env->make_global_ref(env, env->intern(env, "point"));
   Fforward_char = env->make_global_ref(env, env->intern(env, "forward-char"));
   Fget_buffer_window_list =
       env->make_global_ref(env, env->intern(env, "get-buffer-window-list"));
   Fselected_window =
       env->make_global_ref(env, env->intern(env, "selected-window"));
 
   Fvterm_set_title =
       env->make_global_ref(env, env->intern(env, "vterm--set-title"));
   Fvterm_set_directory =
       env->make_global_ref(env, env->intern(env, "vterm--set-directory"));
   Fvterm_invalidate =
       env->make_global_ref(env, env->intern(env, "vterm--invalidate"));
   Feq = env->make_global_ref(env, env->intern(env, "eq"));
   Fvterm_get_color =
       env->make_global_ref(env, env->intern(env, "vterm--get-color"));
   Fvterm_eval = env->make_global_ref(env, env->intern(env, "vterm--eval"));
   Fvterm_set_selection =
       env->make_global_ref(env, env->intern(env, "vterm--set-selection"));
 
   // Exported functions
   emacs_value fun;
   fun =
       env->make_function(env, 4, 8, Fvterm_new, "Allocate a new vterm.", NULL);
   bind_function(env, "vterm--new", fun);
 
   fun = env->make_function(env, 1, 5, Fvterm_update,
                            "Process io and update the screen.", NULL);
   bind_function(env, "vterm--update", fun);
 
   fun =
       env->make_function(env, 1, 1, Fvterm_redraw, "Redraw the screen.", NULL);
   bind_function(env, "vterm--redraw", fun);
 
   fun = env->make_function(env, 2, 2, Fvterm_write_input,
                            "Write input to vterm.", NULL);
   bind_function(env, "vterm--write-input", fun);
 
   fun = env->make_function(env, 3, 3, Fvterm_set_size,
                            "Set the size of the terminal.", NULL);
   bind_function(env, "vterm--set-size", fun);
 
   fun = env->make_function(env, 2, 2, Fvterm_set_pty_name,
                            "Set the name of the pty.", NULL);
   bind_function(env, "vterm--set-pty-name", fun);
   fun = env->make_function(env, 2, 2, Fvterm_get_pwd,
                            "Get the working directory of at line n.", NULL);
   bind_function(env, "vterm--get-pwd-raw", fun);
   fun = env->make_function(env, 1, 1, Fvterm_reset_cursor_point,
                            "Reset cursor postion.", NULL);
   bind_function(env, "vterm--reset-point", fun);
 
   fun = env->make_function(env, 1, 1, Fvterm_get_icrnl,
                            "Get the icrnl state of the pty", NULL);
   bind_function(env, "vterm--get-icrnl", fun);
 
   provide(env, "vterm-module");
 
   return 0;
 }