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-rw-r--r--tags.c86
1 files changed, 86 insertions, 0 deletions
diff --git a/tags.c b/tags.c
new file mode 100644
index 0000000..b1fac23
--- /dev/null
+++ b/tags.c
@@ -0,0 +1,86 @@
+void tags_free(TagsFile *f) {
+ free(f->file_data);
+ arr_free(f->tags);
+ memset(f, 0, sizeof *f);
+}
+
+void tags_read(Ted *ted, TagsFile *f) {
+ change_directory(ted->cwd);
+ Settings const *settings = &ted->settings;
+ char const *tags_filename = settings->tags_filename;
+ FILE *file = fopen(tags_filename, "rb");
+ tags_free(f);
+ if (file) {
+ fseek(file, 0, SEEK_END);
+ size_t file_size = (size_t)ftell(file);
+ fseek(file, 0, SEEK_SET);
+ char *file_data = ted_calloc(ted, file_size + 1, 1);
+ if (file_data) {
+ f->file_data = file_data;
+ fread(file_data, 1, file_size, file);
+ char *p = file_data;
+ while (1) {
+ // each line in the file is of the format:
+ // tag name\tfile name\taddress
+ // or
+ // tag name\tfile name\taddress;" additional information
+
+ char *end = p + strcspn(p, "\n");
+ bool eof = *end == '\0';
+ char *name = p;
+ char *name_end = strchr(name, '\t');
+ if (name_end) {
+ *name_end = '\0';
+ char *filename = name_end + 1;
+ char *filename_end = strchr(filename, '\t');
+ if (filename_end) {
+ *filename_end = '\0';
+ char *address = filename_end + 1;
+ char *address_end = address;
+ int backslashes = 0;
+ while (1) {
+ bool is_end = false;
+ switch (*address_end) {
+ case '\n':
+ case '\r':
+ is_end = true;
+ break;
+ case '\\':
+ ++backslashes;
+ break;
+ case '/':
+ if (address_end != address && backslashes % 2 == 0)
+ is_end = true;
+ break;
+ }
+ if (is_end) break;
+ if (*address_end != '\\') backslashes = 0;
+ ++address_end;
+ }
+ *address_end = '\0';
+ if (address_end - address > 2 && address_end[-2] == ';' && address_end[-1] == '"') {
+ address_end[-2] = '\0';
+ }
+ Tag tag = {.name = name, .file = filename, .address = address};
+ arr_add(f->tags, tag);
+ }
+ }
+ if (eof) break; // end of file
+ p = end + 1;
+ }
+ }
+ f->last_modified = time_last_modified(tags_filename);
+ fclose(file);
+ } else {
+ ted_seterr(ted, "tags file does not exist.");
+ }
+}
+
+void tags_read_if_changed(Ted *ted, TagsFile *f) {
+ Settings const *settings = &ted->settings;
+ char const *tags_filename = settings->tags_filename;
+ struct timespec modify_time = time_last_modified(tags_filename);
+ if (!timespec_eq(modify_time, f->last_modified)) {
+ tags_read(ted, f);
+ }
+} \ No newline at end of file