From 19d6df987ac2d4edc582b048818ba5872c460b4b Mon Sep 17 00:00:00 2001
From: Alex Karle <alex@alexkarle.com>
Date: Fri, 17 Dec 2021 23:09:14 -0500
Subject: [PATCH] Add support for simple no-description links [link]

I was on the fence about this feature, since it means that we need to
store the contents of the link in memory as we parse it (and I was so
proud of the minimal memory used!). I tell myself it's still O(1) if I
use a fixed-length buffer :) AND it makes the source much prettier to
not have to double the link if I want it shown that way.
---
 blag.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/blag.c b/blag.c
index 07dab87..79de3a4 100644
--- a/blag.c
+++ b/blag.c
@@ -22,7 +22,7 @@
  *
  *  Escaping via \
  *
- *  [url Links]
+ *  Links:  [url desc]  or  [url]
  *
  * TODO:
  * -----
@@ -130,6 +130,9 @@ int parse() {
     int in_ital = 0;
     int in_bold = 0;
     int escape = 0;
+    char lnkbuf[2048] = {0};
+    int lnkidx = 0;
+
     while ((c = getchar()) != EOF) {
         /* Handle Escapes before all else */
         if (escape) {
@@ -141,6 +144,11 @@ int parse() {
             escape = 0;
             continue;
         }
+
+        /* Store links as we go */
+        if (in_link == LINK_URL_PARSE && c != ']') {
+            lnkbuf[lnkidx++] = c;
+        }
         
         /* Handle unique state changes by char */
         switch (c) {
@@ -247,24 +255,26 @@ int parse() {
                 }
                 break;
             case '[':
-                if (in_link == NONE) {
+                if (in_link == NONE && !in_code) {
                     if (in == NONE) {
                         /* Assume this is a new paragraph */
                         in = PARAGRAPH;
                         printf("<p>\n");
                     }
-                    /* XXX: need to print the first link */
                     in_link = LINK_URL_PARSE;
+                    lnkidx = 0;
                     printf("<a href=\"");
-                } else if (in_link == LINK_URL_PARSE) {
-                    /* TODO: save to linkbuf to support [url] links? */
-                    putesc(c);
                 } else {
                     putesc(c);
                 }
                 break;
             case ']':
-                if (in_link == LINK_DESC_PARSE) {
+                if (in_link == LINK_URL_PARSE) {
+                    /* no description */
+                    in_link = NONE;
+                    lnkbuf[lnkidx] = '\0';
+                    printf("\">%s</a>", lnkbuf);
+                } else if (in_link == LINK_DESC_PARSE) {
                     in_link = NONE;
                     printf("</a>");
                 } else {
--
libgit2 1.1.1