diff options
Diffstat (limited to 'md_render.c')
| -rw-r--r-- | md_render.c | 881 |
1 files changed, 881 insertions, 0 deletions
diff --git a/md_render.c b/md_render.c new file mode 100644 index 0000000..476a3e4 --- /dev/null +++ b/md_render.c @@ -0,0 +1,881 @@ +#include <gtk/gtk.h> +#include <string.h> +#include <stdio.h> +#include <ctype.h> +#include <stdlib.h> +#include "md_render.h" + +typedef struct { + char **cells; + int count; +} TableRow; + +static void free_table_row(gpointer data) { + TableRow *row = (TableRow*)data; + if (row) { + for (int i = 0; i < row->count; i++) g_free(row->cells[i]); + g_free(row->cells); + g_free(row); + } +} + +static TableRow* parse_table_row(const char *line) { + char *copy = g_strdup(line); + char *start = copy; + while (*start == ' ' || *start == '\t') start++; + if (*start == '|') start++; + + char *end = start + strlen(start) - 1; + while (end > start && (*end == ' ' || *end == '|' || *end == '\r' || *end == '\n' || *end == '\t')) { + *end = '\0'; + end--; + } + + char **parts = g_strsplit(start, "|", -1); + int count = 0; + while (parts[count]) count++; + + TableRow *row = g_malloc0(sizeof(TableRow)); + row->cells = g_malloc0(sizeof(char*) * count); + row->count = count; + for (int i = 0; i < count; i++) { + row->cells[i] = g_strstrip(g_strdup(parts[i])); + } + + g_strfreev(parts); + g_free(copy); + return row; +} + + +static char* process_inline_html(const char *text) { + if (!text) return g_strdup(""); + GString *s = g_string_new(""); + const char *p = text; + while (*p) { + if (strncmp(p, "~~", 2) == 0) { + const char *end = strstr(p + 2, "~~"); + if (end) { + char *inner = g_strndup(p + 2, end - p - 2); + char *processed = process_inline_html(inner); + g_string_append_printf(s, "<del>%s</del>", processed); + g_free(inner); g_free(processed); + p = end + 2; continue; + } + } + if (strncmp(p, "***", 3) == 0) { + const char *end = strstr(p + 3, "***"); + if (end) { + char *inner = g_strndup(p + 3, end - p - 3); + char *processed = process_inline_html(inner); + g_string_append_printf(s, "<strong><em>%s</em></strong>", processed); + g_free(inner); g_free(processed); + p = end + 3; continue; + } + } + if (strncmp(p, "**", 2) == 0 || strncmp(p, "__", 2) == 0) { + const char *marker = strncmp(p, "**", 2) == 0 ? "**" : "__"; + const char *end = strstr(p + 2, marker); + if (end) { + char *inner = g_strndup(p + 2, end - p - 2); + char *processed = process_inline_html(inner); + g_string_append_printf(s, "<strong>%s</strong>", processed); + g_free(inner); g_free(processed); + p = end + 2; continue; + } + } + if (*p == '*' || *p == '_') { + char marker[2] = {*p, 0}; + const char *end = strpbrk(p + 1, marker); + if (end && *end == *p) { + char *inner = g_strndup(p + 1, end - p - 1); + char *processed = process_inline_html(inner); + g_string_append_printf(s, "<em>%s</em>", processed); + g_free(inner); g_free(processed); + p = end + 1; continue; + } + } + if (*p == '`') { + const char *end = strchr(p + 1, '`'); + if (end) { + char *inner = g_strndup(p + 1, end - p - 1); + g_string_append_printf(s, "<code>%s</code>", inner); + p = end + 1; g_free(inner); continue; + } + } + if (strncmp(p, "![", 2) == 0) { + const char *alt_end = strchr(p + 2, ']'); + if (alt_end && alt_end[1] == '(') { + const char *url_end = strchr(alt_end + 2, ')'); + if (url_end) { + char *alt = g_strndup(p + 2, alt_end - p - 2); + char *url = g_strndup(alt_end + 2, url_end - alt_end - 2); + g_string_append_printf(s, "<img src=\"%s\" alt=\"%s\" style=\"max-width:100%%;\">", url, alt); + g_free(alt); g_free(url); + p = url_end + 1; continue; + } + } + } + if (*p == '[') { + const char *txt_end = strchr(p + 1, ']'); + if (txt_end && txt_end[1] == '(') { + const char *url_end = strchr(txt_end + 2, ')'); + if (url_end) { + char *txt = g_strndup(p + 1, txt_end - p - 1); + char *url = g_strndup(txt_end + 2, url_end - txt_end - 2); + char *processed_txt = process_inline_html(txt); + g_string_append_printf(s, "<a href=\"%s\">%s</a>", url, processed_txt); + g_free(txt); g_free(url); g_free(processed_txt); + p = url_end + 1; continue; + } + } + } + if (strncmp(p, "http://", 7) == 0 || strncmp(p, "https://", 8) == 0) { + const char *end = p; + while (*end && !isspace(*end) && *end != ')' && *end != ']' && *end != '>') end++; + char *url = g_strndup(p, end - p); + g_string_append_printf(s, "<a href=\"%s\">%s</a>", url, url); + g_free(url); + p = end; continue; + } + g_string_append_c(s, *p); + p++; + } + return g_string_free(s, FALSE); +} + +static void insert_recursive(GtkTextBuffer *buffer, GtkTextIter *iter, const char *text, GSList *tags) { + if (!text || !*text) return; + + const char *p = text; + while (*p) { + // Strikethrough ~~ + if (strncmp(p, "~~", 2) == 0) { + const char *end = strstr(p + 2, "~~"); + if (end) { + char *inner = g_strndup(p + 2, end - p - 2); + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "strikethrough"); + GSList *new_tags = g_slist_prepend(g_slist_copy(tags), tag); + insert_recursive(buffer, iter, inner, new_tags); + g_slist_free(new_tags); + g_free(inner); + p = end + 2; continue; + } + } + // Bold+Italic *** + if (strncmp(p, "***", 3) == 0) { + const char *end = strstr(p + 3, "***"); + if (end) { + char *inner = g_strndup(p + 3, end - p - 3); + GtkTextTag *t1 = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "bold"); + GtkTextTag *t2 = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "italic"); + GSList *new_tags = g_slist_prepend(g_slist_prepend(g_slist_copy(tags), t1), t2); + insert_recursive(buffer, iter, inner, new_tags); + g_slist_free(new_tags); + g_free(inner); + p = end + 3; continue; + } + } + // Bold ** or __ + if (strncmp(p, "**", 2) == 0 || strncmp(p, "__", 2) == 0) { + const char *marker = strncmp(p, "**", 2) == 0 ? "**" : "__"; + const char *end = strstr(p + 2, marker); + if (end) { + char *inner = g_strndup(p + 2, end - p - 2); + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "bold"); + GSList *new_tags = g_slist_prepend(g_slist_copy(tags), tag); + insert_recursive(buffer, iter, inner, new_tags); + g_slist_free(new_tags); + g_free(inner); + p = end + 2; continue; + } + } + // Italic * or _ + if (*p == '*' || *p == '_') { + char marker[2] = {*p, 0}; + const char *end = strpbrk(p + 1, marker); + if (end && *end == *p) { + char *inner = g_strndup(p + 1, end - p - 1); + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "italic"); + GSList *new_tags = g_slist_prepend(g_slist_copy(tags), tag); + insert_recursive(buffer, iter, inner, new_tags); + g_slist_free(new_tags); + g_free(inner); + p = end + 1; continue; + } + } + // Code ` + if (*p == '`') { + const char *end = strchr(p + 1, '`'); + if (end) { + char *inner = g_strndup(p + 1, end - p - 1); + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "code"); + GSList *new_tags = g_slist_prepend(g_slist_copy(tags), tag); + // Code is not recursive - use marks to preserve position + GtkTextMark *start_mark = gtk_text_buffer_create_mark(buffer, NULL, iter, TRUE); + gtk_text_buffer_insert(buffer, iter, inner, -1); + GtkTextIter start_ins; + gtk_text_buffer_get_iter_at_mark(buffer, &start_ins, start_mark); + for (GSList *l = new_tags; l; l = l->next) { + gtk_text_buffer_apply_tag(buffer, (GtkTextTag*)l->data, &start_ins, iter); + } + gtk_text_buffer_delete_mark(buffer, start_mark); + g_slist_free(new_tags); + g_free(inner); + p = end + 1; continue; + } + } + // Image  + if (strncmp(p, "![", 2) == 0) { + const char *alt_end = strchr(p + 2, ']'); + if (alt_end && alt_end[1] == '(') { + const char *url_end = strchr(alt_end + 2, ')'); + if (url_end) { + char *path_start = (char*)alt_end + 2; + char *path = g_strndup(path_start, url_end - path_start); + if (strncmp(path, "http", 4) == 0) { + // Placeholder for remote + char *msg = g_strdup_printf("[Remote Image: %s]", path); + gtk_text_buffer_insert(buffer, iter, msg, -1); + g_free(msg); + } else { + GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file_at_scale(path, 600, -1, TRUE, NULL); + if (pixbuf) { + gtk_text_buffer_insert_pixbuf(buffer, iter, pixbuf); + g_object_unref(pixbuf); + } else { + char *msg = g_strdup_printf("[Image not found: %s]", path); + gtk_text_buffer_insert(buffer, iter, msg, -1); + g_free(msg); + } + } + g_free(path); + p = url_end + 1; continue; + } + } + } + // Link [text](url) + if (*p == '[') { + const char *txt_end = strchr(p + 1, ']'); + if (txt_end && txt_end[1] == '(') { + const char *url_end = strchr(txt_end + 2, ')'); + if (url_end) { + char *txt = g_strndup(p + 1, txt_end - p - 1); + char *url = g_strndup(txt_end + 2, url_end - txt_end - 2); + + GtkTextTag *url_tag = gtk_text_buffer_create_tag(buffer, NULL, "foreground", "blue", "underline", PANGO_UNDERLINE_SINGLE, NULL); + g_object_set_data_full(G_OBJECT(url_tag), "url", g_strdup(url), g_free); + + GSList *new_tags = g_slist_prepend(g_slist_copy(tags), url_tag); + insert_recursive(buffer, iter, txt, new_tags); + + g_slist_free(new_tags); + g_free(txt); g_free(url); + p = url_end + 1; continue; + } + } + } + // Auto-link http://... + if (strncmp(p, "http://", 7) == 0 || strncmp(p, "https://", 8) == 0) { + const char *end = p; + while (*end && !isspace(*end) && *end != ')' && *end != ']' && *end != '>') end++; + char *url = g_strndup(p, end - p); + + GtkTextTag *url_tag = gtk_text_buffer_create_tag(buffer, NULL, "foreground", "blue", "underline", PANGO_UNDERLINE_SINGLE, NULL); + g_object_set_data_full(G_OBJECT(url_tag), "url", g_strdup(url), g_free); + + GtkTextMark *start_mark = gtk_text_buffer_create_mark(buffer, NULL, iter, TRUE); + gtk_text_buffer_insert(buffer, iter, url, -1); + GtkTextIter start_ins; + gtk_text_buffer_get_iter_at_mark(buffer, &start_ins, start_mark); + + // Apply background tags + url tag + for (GSList *l = tags; l; l = l->next) gtk_text_buffer_apply_tag(buffer, (GtkTextTag*)l->data, &start_ins, iter); + gtk_text_buffer_apply_tag(buffer, url_tag, &start_ins, iter); + + gtk_text_buffer_delete_mark(buffer, start_mark); + g_free(url); + p = end; continue; + } + + // Plain text + GtkTextMark *start_mark = gtk_text_buffer_create_mark(buffer, NULL, iter, TRUE); + char buf[2] = {*p, 0}; + gtk_text_buffer_insert(buffer, iter, buf, 1); + GtkTextIter start_ins; + gtk_text_buffer_get_iter_at_mark(buffer, &start_ins, start_mark); + for (GSList *l = tags; l; l = l->next) { + gtk_text_buffer_apply_tag(buffer, (GtkTextTag*)l->data, &start_ins, iter); + } + gtk_text_buffer_delete_mark(buffer, start_mark); + p++; + } +} + +void md_render_init_tags(GtkTextBuffer *buffer) { + gtk_text_buffer_create_tag(buffer, "h1", "weight", PANGO_WEIGHT_BOLD, "size", 24 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "h2", "weight", PANGO_WEIGHT_BOLD, "size", 20 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "h3", "weight", PANGO_WEIGHT_BOLD, "size", 16 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "h4", "weight", PANGO_WEIGHT_BOLD, "size", 14 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "h5", "weight", PANGO_WEIGHT_BOLD, "size", 12 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "h6", "weight", PANGO_WEIGHT_BOLD, "size", 10 * PANGO_SCALE, NULL); + gtk_text_buffer_create_tag(buffer, "bold", "weight", PANGO_WEIGHT_BOLD, NULL); + gtk_text_buffer_create_tag(buffer, "italic", "style", PANGO_STYLE_ITALIC, NULL); + gtk_text_buffer_create_tag(buffer, "bold_italic", "weight", PANGO_WEIGHT_BOLD, "style", PANGO_STYLE_ITALIC, NULL); + gtk_text_buffer_create_tag(buffer, "code", "family", "monospace", NULL); + gtk_text_buffer_create_tag(buffer, "checkbox_off", "foreground", "red", "weight", PANGO_WEIGHT_BOLD, NULL); + gtk_text_buffer_create_tag(buffer, "checkbox_on", "foreground", "green", "weight", PANGO_WEIGHT_BOLD, NULL); + gtk_text_buffer_create_tag(buffer, "code_block", "family", "monospace", + "pixels-above-lines", 8, "pixels-below-lines", 8, + "left-margin", 15, "right-margin", 15, NULL); + gtk_text_buffer_create_tag(buffer, "list", "left-margin", 20, NULL); + gtk_text_buffer_create_tag(buffer, "blockquote", "left-margin", 30, "style", PANGO_STYLE_ITALIC, NULL); + gtk_text_buffer_create_tag(buffer, "hr", "underline", PANGO_UNDERLINE_SINGLE, "pixels-above-lines", 10, "pixels-below-lines", 10, NULL); + gtk_text_buffer_create_tag(buffer, "table", "family", "monospace", "left-margin", 10, NULL); + gtk_text_buffer_create_tag(buffer, "link", "foreground", "blue", "underline", PANGO_UNDERLINE_SINGLE, NULL); + gtk_text_buffer_create_tag(buffer, "strikethrough", "strikethrough", TRUE, NULL); + gtk_text_buffer_create_tag(buffer, "normal_text", NULL); +} + +static void update_tag_colors(GtkTextBuffer *buffer, int theme) { + const char *h1_fg = theme ? "#ffffff" : "#1a1a1a"; + const char *h2_fg = theme ? "#f0f0f0" : "#2d2d2d"; + const char *h3_fg = theme ? "#e0e0e0" : "#444444"; + const char *h4_fg = theme ? "#cccccc" : "#666666"; + const char *h5_fg = theme ? "#bbbbbb" : "#777777"; + const char *h6_fg = theme ? "#aaaaaa" : "#888888"; + const char *text_fg = theme ? "#ffffff" : "#24292e"; + const char *bold_fg = theme ? "#ffffff" : "#000000"; + const char *italic_fg = theme ? "#cccccc" : "#555555"; + const char *bq_fg = theme ? "#95a5a6" : "#7f8c8d"; + const char *code_bg = theme ? "#2d3436" : "#f0f0f0"; + const char *code_fg = theme ? "#fab1a0" : "#d73a49"; + const char *cb_bg = theme ? "#2d3436" : "#f6f8fa"; + const char *cb_fg = theme ? "#dfe6e9" : "#24292e"; + const char *cb_on_fg = theme ? "#55efc4" : "#27ae60"; + const char *cb_off_fg = theme ? "#ff7675" : "#d63031"; + const char *link_fg = theme ? "#a5d6ff" : "#0984e3"; + const char *hr_fg = theme ? "#636e72" : "#dfe6e9"; + + GtkTextTagTable *table = gtk_text_buffer_get_tag_table(buffer); + + g_object_set(gtk_text_tag_table_lookup(table, "checkbox_on"), "foreground", cb_on_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "checkbox_off"), "foreground", cb_off_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h1"), "foreground", h1_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h2"), "foreground", h2_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h3"), "foreground", h3_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h4"), "foreground", h4_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h5"), "foreground", h5_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "h6"), "foreground", h6_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "bold"), "foreground", bold_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "italic"), "foreground", italic_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "bold_italic"), "foreground", bold_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "blockquote"), "foreground", bq_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "code"), "background", code_bg, "foreground", code_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "code_block"), "background", cb_bg, "foreground", cb_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "list"), "foreground", text_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "link"), "foreground", link_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "hr"), "foreground", hr_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "table"), "foreground", text_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "strikethrough"), "foreground", italic_fg, NULL); + g_object_set(gtk_text_tag_table_lookup(table, "normal_text"), "foreground", text_fg, NULL); +} + +void md_render_to_buffer(GtkTextBuffer *buffer, const char *text, int theme) { + update_tag_colors(buffer, theme); + gtk_text_buffer_set_text(buffer, "", 0); + + GtkTextIter iter; + gtk_text_buffer_get_start_iter(buffer, &iter); + + char *line_copy = g_strdup(text); + char *saveptr; + char *token = strtok_r(line_copy, "\n", &saveptr); + char *pending_token = NULL; + int in_code_block = 0; + + while (token != NULL || pending_token != NULL) { + if (pending_token) { + token = pending_token; + pending_token = NULL; + } + + char *p_trimmed = token; + while (*p_trimmed == ' ' || *p_trimmed == '\t') p_trimmed++; + + if (strncmp(p_trimmed, "```", 3) == 0) { + in_code_block = !in_code_block; + token = strtok_r(NULL, "\n", &saveptr); + continue; + } + + if (in_code_block) { + gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, token, -1, "code_block", NULL); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (p_trimmed[0] == '|') { + GList *rows = NULL; + int max_cols = 0; + char *current_line = token; + + while (current_line) { + char *cl_trimmed = current_line; + while (*cl_trimmed == ' ' || *cl_trimmed == '\t') cl_trimmed++; + if (cl_trimmed[0] == '|') { + TableRow *row = parse_table_row(current_line); + rows = g_list_append(rows, row); + if (row->count > max_cols) max_cols = row->count; + current_line = strtok_r(NULL, "\n", &saveptr); + } else { + pending_token = current_line; + break; + } + } + + if (rows) { + int *col_widths = g_malloc0(sizeof(int) * max_cols); + for (GList *l = rows; l; l = l->next) { + TableRow *row = (TableRow*)l->data; + for (int i = 0; i < row->count; i++) { + int len = g_utf8_strlen(row->cells[i], -1); + if (len > col_widths[i]) col_widths[i] = len; + } + } + + for (GList *l = rows; l; l = l->next) { + TableRow *row = (TableRow*)l->data; + if (row->count > 0 && strstr(row->cells[0], "---")) continue; // Skip divider row in visual view + + gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, "| ", 2, "table", NULL); + for (int i = 0; i < max_cols; i++) { + const char *cell_text = (i < row->count) ? row->cells[i] : ""; + gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, cell_text, -1, "table", NULL); + int padding = col_widths[i] - g_utf8_strlen(cell_text, -1); + for (int k = 0; k < padding; k++) gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, " ", 1, "table", NULL); + if (i < max_cols - 1) gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, " | ", 3, "table", NULL); + } + gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, " |", 2, "table", NULL); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } + g_free(col_widths); + g_list_free_full(rows, free_table_row); + } + if (pending_token) continue; + } else if (strncmp(p_trimmed, "---", 3) == 0 || strncmp(p_trimmed, "***", 3) == 0 || strncmp(p_trimmed, "___", 3) == 0) { + gtk_text_buffer_insert_with_tags_by_name(buffer, &iter, " ", -1, "hr", NULL); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "###### ", 7) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h6"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 7, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "##### ", 6) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h5"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 6, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "#### ", 5) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h4"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 5, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "### ", 4) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h3"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 4, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "## ", 3) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h2"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 3, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "# ", 2) == 0) { + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "h1"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, p_trimmed + 2, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (p_trimmed[0] == '>') { + int bq_level = 0; + char *p = p_trimmed; + while (*p == '>' || *p == ' ') { + if (*p == '>') bq_level++; + p++; + } + char tag[32]; + snprintf(tag, sizeof(tag), "blockquote_%d", bq_level > 5 ? 5 : bq_level); + if (!gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag)) { + gtk_text_buffer_create_tag(buffer, tag, "left-margin", bq_level * 30, "style", PANGO_STYLE_ITALIC, NULL); + } + GtkTextTag *bq_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag); + GtkTextTag *base_bq = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "blockquote"); + GSList *tags = g_slist_prepend(g_slist_prepend(NULL, bq_tag), base_bq); + insert_recursive(buffer, &iter, p, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "- [ ]", 5) == 0 && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + int indent = p_trimmed - token; + char tag[32]; + snprintf(tag, sizeof(tag), "list_%d", indent); + if (!gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag)) { + gtk_text_buffer_create_tag(buffer, tag, "left-margin", 20 + indent * 10, NULL); + } + GtkTextTag *list_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag); + GtkTextTag *cb_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "checkbox_off"); + // Checkbox part + gtk_text_buffer_insert_with_tags(buffer, &iter, "☐ ", -1, cb_tag, list_tag, NULL); + // Text part + GSList *tags = g_slist_prepend(NULL, list_tag); + insert_recursive(buffer, &iter, p_trimmed + (p_trimmed[5] == ' ' ? 6 : 5), tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if ((strncmp(p_trimmed, "- [x]", 5) == 0 || strncmp(p_trimmed, "- [X]", 5) == 0) && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + int indent = p_trimmed - token; + char tag[32]; + snprintf(tag, sizeof(tag), "list_%d", indent); + if (!gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag)) { + gtk_text_buffer_create_tag(buffer, tag, "left-margin", 20 + indent * 10, NULL); + } + GtkTextTag *list_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag); + GtkTextTag *cb_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "checkbox_on"); + // Checkbox part + gtk_text_buffer_insert_with_tags(buffer, &iter, "☑ ", -1, cb_tag, list_tag, NULL); + // Text part + GSList *tags = g_slist_prepend(NULL, list_tag); + insert_recursive(buffer, &iter, p_trimmed + (p_trimmed[5] == ' ' ? 6 : 5), tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (strncmp(p_trimmed, "- ", 2) == 0 || strncmp(p_trimmed, "* ", 2) == 0) { + int indent = p_trimmed - token; + char tag[32]; + snprintf(tag, sizeof(tag), "list_%d", indent); + if (!gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag)) { + gtk_text_buffer_create_tag(buffer, tag, "left-margin", 20 + indent * 10, NULL); + } + GtkTextTag *list_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag); + GtkTextTag *base_list = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "list"); + // Bullet part + gtk_text_buffer_insert_with_tags(buffer, &iter, "• ", -1, list_tag, base_list, NULL); + // Text part + GSList *tags = g_slist_prepend(g_slist_prepend(NULL, list_tag), base_list); + insert_recursive(buffer, &iter, p_trimmed + 2, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else if (isdigit(p_trimmed[0]) && strstr(p_trimmed, ". ")) { + char *p = strstr(p_trimmed, ". "); + if (p - p_trimmed < 4) { + int indent = p_trimmed - token; + char tag[32]; + snprintf(tag, sizeof(tag), "list_%d", indent); + if (!gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag)) { + gtk_text_buffer_create_tag(buffer, tag, "left-margin", 20 + indent * 10, NULL); + } + GtkTextTag *list_tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), tag); + GtkTextTag *base_list = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "list"); + GSList *tags = g_slist_prepend(g_slist_prepend(NULL, list_tag), base_list); + insert_recursive(buffer, &iter, p_trimmed, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else { + goto normal_text; + } + } else if (strncmp(token, "![", 2) == 0) { + insert_recursive(buffer, &iter, token, NULL); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } else { + normal_text: ; + GtkTextTag *tag = gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "normal_text"); + GSList *tags = g_slist_prepend(NULL, tag); + insert_recursive(buffer, &iter, token, tags); + g_slist_free(tags); + gtk_text_buffer_insert(buffer, &iter, "\n", 1); + } + token = strtok_r(NULL, "\n", &saveptr); + } + free(line_copy); +} + +char* md_to_html(const char *text) { + GString *html = g_string_new("<!DOCTYPE html><html><head><meta charset=\"UTF-8\">"); + g_string_append(html, "<style>body{font-family:sans-serif;line-height:1.6;max-width:800px;margin:2em auto;padding:0 1em;color:#24292e;}"); + g_string_append(html, "h1,h2,h3,h4,h5,h6{border-bottom:1px solid #eaecef;padding-bottom:.3em;}"); + g_string_append(html, "pre{background:#f6f8fa;padding:16px;border-radius:3px;overflow:auto;}"); + g_string_append(html, "code{background:rgba(27,31,35,0.05);padding:.2em .4em;border-radius:3px;font-family:monospace;}"); + g_string_append(html, "blockquote{border-left:.25em solid #dfe2e5;color:#6a737d;padding:0 1em;margin:0 0 16px 0;}"); + g_string_append(html, "table{border-collapse:collapse;width:100%;}table td,table th{border:1px solid #dfe2e5;padding:6px 13px;}"); + g_string_append(html, "hr{height:.25em;background-color:#e1e4e8;border:0;margin:24px 0;}</style></head><body>"); + + char *line_copy = g_strdup(text); + char *saveptr; + char *token = strtok_r(line_copy, "\n", &saveptr); + char *pending_token = NULL; + int in_code_block = 0; + + while (token != NULL || pending_token != NULL) { + if (pending_token) { + token = pending_token; + pending_token = NULL; + } + + char *p_trimmed = token; + while (*p_trimmed == ' ' || *p_trimmed == '\t') p_trimmed++; + + if (strncmp(p_trimmed, "```", 3) == 0) { + if (in_code_block) g_string_append(html, "</pre>\n"); + else g_string_append(html, "<pre>\n"); + in_code_block = !in_code_block; + token = strtok_r(NULL, "\n", &saveptr); + continue; + } + + if (in_code_block) { + g_string_append(html, token); + g_string_append(html, "\n"); + } else if (strncmp(token, "---", 3) == 0 || strncmp(token, "***", 3) == 0) { + g_string_append(html, "<hr>\n"); + } else if (strncmp(token, "###### ", 7) == 0) { + char *inline_text = process_inline_html(token + 7); + g_string_append_printf(html, "<h6>%s</h6>\n", inline_text); + g_free(inline_text); + } else if (strncmp(token, "##### ", 6) == 0) { + char *inline_text = process_inline_html(token + 6); + g_string_append_printf(html, "<h5>%s</h5>", inline_text); + g_free(inline_text); + } else if (strncmp(token, "#### ", 5) == 0) { + char *inline_text = process_inline_html(token + 5); + g_string_append_printf(html, "<h4>%s</h4>", inline_text); + g_free(inline_text); + } else if (strncmp(token, "### ", 4) == 0) { + char *inline_text = process_inline_html(token + 4); + g_string_append_printf(html, "<h3>%s</h3>", inline_text); + g_free(inline_text); + } else if (strncmp(token, "## ", 3) == 0) { + char *inline_text = process_inline_html(token + 3); + g_string_append_printf(html, "<h2>%s</h2>", inline_text); + g_free(inline_text); + } else if (strncmp(token, "# ", 2) == 0) { + char *inline_text = process_inline_html(token + 2); + g_string_append_printf(html, "<h1>%s</h1>\n", inline_text); + g_free(inline_text); + } else if (p_trimmed[0] == '>') { + int bq_level = 0; + char *p = p_trimmed; + while (*p == '>' || *p == ' ') { + if (*p == '>') bq_level++; + p++; + } + char *inline_text = process_inline_html(p); + for (int i = 0; i < bq_level; i++) g_string_append(html, "<blockquote>"); + g_string_append_printf(html, "%s", inline_text); + for (int i = 0; i < bq_level; i++) g_string_append(html, "</blockquote>\n"); + g_free(inline_text); + } else if (strncmp(p_trimmed, "- [ ]", 5) == 0 && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + char *inline_text = process_inline_html(p_trimmed + (p_trimmed[5] == ' ' ? 6 : 5)); + g_string_append_printf(html, "\t<li><input type=\"checkbox\" disabled> %s</li>\n", inline_text); + g_free(inline_text); + } else if ((strncmp(p_trimmed, "- [x]", 5) == 0 || strncmp(p_trimmed, "- [X]", 5) == 0) && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + char *inline_text = process_inline_html(p_trimmed + (p_trimmed[5] == ' ' ? 6 : 5)); + g_string_append_printf(html, "\t<li><input type=\"checkbox\" checked disabled> %s</li>\n", inline_text); + g_free(inline_text); + } else if (strncmp(p_trimmed, "- ", 2) == 0 || strncmp(p_trimmed, "* ", 2) == 0) { + int indent = p_trimmed - token; + char *inline_text = process_inline_html(p_trimmed + 2); + g_string_append_printf(html, "\t<li style=\"margin-left: %dpx\">%s</li>\n", indent * 20, inline_text); + g_free(inline_text); + } else if (p_trimmed[0] == '!' && p_trimmed[1] == '[') { + char *alt_start = p_trimmed + 2; + char *alt_end = strchr(alt_start, ']'); + if (alt_end && alt_end[1] == '(') { + char *url_start = alt_end + 2; + char *url_end = strchr(url_start, ')'); + if (url_end) { + *alt_end = '\0'; + *url_end = '\0'; + g_string_append_printf(html, "<img src=\"%s\" alt=\"%s\" style=\"max-width:100%%;height:auto;\">\n", url_start, alt_start); + *alt_end = ']'; + *url_end = ')'; + } + } + } else if (token[0] == '|') { + g_string_append(html, "<table>"); + int first_row = 1; + char *current_line = token; + while (current_line) { + if (current_line[0] == '|') { + TableRow *row = parse_table_row(current_line); + if (row->count > 0 && strstr(row->cells[0], "---")) { + free_table_row(row); + } else { + g_string_append(html, "<tr>"); + for (int i = 0; i < row->count; i++) { + const char *tag = first_row ? "th" : "td"; + g_string_append_printf(html, "<%s>%s</%s>", tag, row->cells[i], tag); + } + g_string_append(html, "</tr>"); + first_row = 0; + free_table_row(row); + } + current_line = strtok_r(NULL, "\n", &saveptr); + } else { + pending_token = current_line; + break; + } + } + g_string_append(html, "</table>"); + if (pending_token) continue; + } else { + char *inline_text = process_inline_html(token); + g_string_append_printf(html, "<p>%s</p>", inline_text); + g_free(inline_text); + } + if (!pending_token) + token = strtok_r(NULL, "\n", &saveptr); + } + + if (in_code_block) g_string_append(html, "</pre>\n"); + g_string_append(html, "</body>\n</html>"); + free(line_copy); + return g_string_free(html, FALSE); +} + +void md_render_highlight_editor(GtkTextBuffer *buffer, int theme) { + GtkTextIter start, end; + gtk_text_buffer_get_bounds(buffer, &start, &end); + + const char *tags[] = {"h1", "h2", "h3", "h4", "h5", "h6", "bold", "italic", "bold_italic", "code", "code_block", "list", "blockquote", "checkbox_on", "checkbox_off", "normal_text"}; + for (int i = 0; i < 16; i++) { + gtk_text_buffer_remove_tag_by_name(buffer, tags[i], &start, &end); + } + + update_tag_colors(buffer, theme); + + int line_count = gtk_text_buffer_get_line_count(buffer); + for (int i = 0; i < line_count; i++) { + GtkTextIter line_start, line_end; + gtk_text_buffer_get_iter_at_line(buffer, &line_start, i); + line_end = line_start; + gtk_text_iter_forward_to_line_end(&line_end); + + char *line_text = gtk_text_buffer_get_text(buffer, &line_start, &line_end, FALSE); + if (!line_text) continue; + + char *p_trimmed = line_text; + while (*p_trimmed == ' ' || *p_trimmed == '\t') p_trimmed++; + + if (strncmp(p_trimmed, "###### ", 7) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h6", &line_start, &line_end); + } else if (strncmp(p_trimmed, "##### ", 6) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h5", &line_start, &line_end); + } else if (strncmp(p_trimmed, "#### ", 5) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h4", &line_start, &line_end); + } else if (strncmp(p_trimmed, "### ", 4) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h3", &line_start, &line_end); + } else if (strncmp(p_trimmed, "## ", 3) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h2", &line_start, &line_end); + } else if (strncmp(p_trimmed, "# ", 2) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "h1", &line_start, &line_end); + } else if (strncmp(p_trimmed, ">> ", 3) == 0 || strncmp(p_trimmed, "> ", 2) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "blockquote", &line_start, &line_end); + } else if (strncmp(p_trimmed, "- [ ]", 5) == 0 && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + gtk_text_buffer_apply_tag_by_name(buffer, "checkbox_off", &line_start, &line_end); + } else if ((strncmp(p_trimmed, "- [x]", 5) == 0 || strncmp(p_trimmed, "- [X]", 5) == 0) && (p_trimmed[5] == ' ' || p_trimmed[5] == '\0')) { + gtk_text_buffer_apply_tag_by_name(buffer, "checkbox_on", &line_start, &line_end); + } else if (strncmp(p_trimmed, "- ", 2) == 0 || strncmp(p_trimmed, "* ", 2) == 0 || isdigit(p_trimmed[0])) { + gtk_text_buffer_apply_tag_by_name(buffer, "list", &line_start, &line_end); + } else if (strncmp(p_trimmed, "```", 3) == 0) { + gtk_text_buffer_apply_tag_by_name(buffer, "code_block", &line_start, &line_end); + } else { + const char *p = line_text; + while (*p) { + if (strncmp(p, "~~", 2) == 0) { + const char *end_p = strstr(p + 2, "~~"); + if (end_p) { + GtkTextIter match_start = line_start; + GtkTextIter match_end = line_start; + gtk_text_iter_forward_chars(&match_start, p - line_text); + gtk_text_iter_forward_chars(&match_end, end_p + 2 - line_text); + gtk_text_buffer_apply_tag_by_name(buffer, "strikethrough", &match_start, &match_end); + p = end_p + 1; + } + } + if (strncmp(p, "**", 2) == 0) { + const char *end_p = strstr(p + 2, "**"); + if (end_p) { + GtkTextIter match_start = line_start; + GtkTextIter match_end = line_start; + gtk_text_iter_forward_chars(&match_start, p - line_text); + gtk_text_iter_forward_chars(&match_end, end_p + 2 - line_text); + gtk_text_buffer_apply_tag_by_name(buffer, "bold", &match_start, &match_end); + p = end_p + 1; + } + } else if (*p == '*' || *p == '_') { + const char *end_p = strpbrk(p + 1, "*_"); + if (end_p && *end_p == *p) { + GtkTextIter match_start = line_start; + GtkTextIter match_end = line_start; + gtk_text_iter_forward_chars(&match_start, p - line_text); + gtk_text_iter_forward_chars(&match_end, end_p + 1 - line_text); + gtk_text_buffer_apply_tag_by_name(buffer, "italic", &match_start, &match_end); + p = end_p; + } + } else if (*p == '`') { + const char *end_p = strchr(p + 1, '`'); + if (end_p) { + GtkTextIter match_start = line_start; + GtkTextIter match_end = line_start; + gtk_text_iter_forward_chars(&match_start, p - line_text); + gtk_text_iter_forward_chars(&match_end, end_p + 1 - line_text); + gtk_text_buffer_apply_tag_by_name(buffer, "code", &match_start, &match_end); + p = end_p; + } + } + p++; + } + } + g_free(line_text); + } +} + +GList* md_get_headers(const char *text) { + GList *headers = NULL; + char *line_copy = strdup(text); + char *saveptr; + char *token = strtok_r(line_copy, "\n", &saveptr); + int line_num = 0; + + while (token != NULL) { + int level = 0; + if (strncmp(token, "###### ", 7) == 0) level = 6; + else if (strncmp(token, "##### ", 6) == 0) level = 5; + else if (strncmp(token, "#### ", 5) == 0) level = 4; + else if (strncmp(token, "### ", 4) == 0) level = 3; + else if (strncmp(token, "## ", 3) == 0) level = 2; + else if (strncmp(token, "# ", 2) == 0) level = 1; + + if (level > 0) { + MdHeader *h = g_malloc0(sizeof(MdHeader)); + h->text = g_strdup(token + level + 1); + h->line = line_num; + h->level = level; + headers = g_list_append(headers, h); + } + token = strtok_r(NULL, "\n", &saveptr); + line_num++; + } + free(line_copy); + return headers; +} + +void md_free_headers(GList *headers) { + if (!headers) return; + for (GList *l = headers; l != NULL; l = l->next) { + MdHeader *h = (MdHeader*)l->data; + g_free(h->text); + g_free(h); + } + g_list_free(headers); +} |