Added first pass at ctags file utility

diff --git a/fetchtag.c b/fetchtag.c
new file mode 100644 (file)
index 0000000..8b0105a
--- /dev/null
+++ b/fetchtag.c
@@ -0,0 +1,52 @@
+#include <stdc.h>
+#include <utf.h>
+#include <edit.h>
+
+typedef struct {
+    char* file;
+    char* cmd;
+} Choice;
+
+void add_choice(uint8_t* buf, size_t n) {
+    char* str = malloc(n);
+    memcpy(str, buf, n);
+    str[n] = '\0';
+    /**/
+    char* tag  = strtok(str, "\t");
+    char* file = strtok(NULL, "\t");
+    char* cmd  = file + strlen(file) + 1;
+    char* end  = strrchr(cmd, ';');
+    if (end) *end = '\0';
+
+    puts(tag);
+    puts(file);
+    puts(cmd);
+}
+
+void fetchtags(char* tagfile, char* tag) {
+    size_t mlen = strlen(tag);
+    FMap file = fmap(tagfile);
+    for (size_t n, i = 0; i < file.len;) {
+        if (file.buf[i] > *tag) {
+            break;
+        } if ((file.buf[i + mlen] == '\t') &&
+              (0 == strncmp(((char*)file.buf+i), tag, mlen))) {
+            for (n = 0; file.buf[i + n++] != '\n';);
+            add_choice(file.buf + i, n-1);
+            i += n;
+        } else {
+            while (file.buf[i++] != '\n');
+        }
+    }
+}
+
+int main(int argc, char** argv) {
+    /* usage message */
+    if (argc != 3) {
+        printf("Usage: %s <tagfile> <tag>\n", argv[0]);
+        exit(1);
+    }
+    /* scan the file */
+    fetchtags(argv[1], argv[2]);
+    return 0;
+}