feat: add shortcuts plugin

plugins/shortcuts/README.md

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+## About
+
+This code automatically redirects shortcuts to their longer expansions. Similar to DuckDuckGo's bangs (<https://duckduckgo.com/bangs>)

plugins/shortcuts/shortcuts.c

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+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "../libre_redirect/str_replace_start.h"
+
+#define SHORTCUT_N 20
+
+/* Uncomment for debug */
+/* #define DEBUG */
+
+/* Inspired by https://duckduckgo.com/bangs */
+
+void str_init(char* str, int n)
+{
+    for (int i = 0; i < n; i++)
+        str[i] = ' ';
+    str[n] = '\0';
+} // could also use <https://manpages.ubuntu.com/manpages/impish/man3/strinit.3pub.html>
+
+int shortcut_expand(const char* uri, char* output)
+{
+    int l1 = strlen(uri);
+    int l2 = strlen(output);
+    int len;
+    char tmp_uri[l2++];
+    char tmp_output[l2++];
+
+    if ((l2 - l1) < SHORTCUT_N) {
+#ifdef DEBUG
+        printf("Not enough memory\n");
+#endif
+        return 1; // not enough memory.
+    } else {
+        strcpy(tmp_uri, uri); // strcpy also copies the terminating '\0'
+        strcpy(tmp_output, output);
+
+        char* shortcuts[] = {
+            "!fnf",
+            "!fnc",
+						"!hn",
+						"!hnb"
+        };
+
+        char* expansions[] = {
+            "https://forum.nunosempere.com/frontpage",
+            "https://forum.nunosempere.com/comments",
+            "https://news.ycombinator.com",
+            "https://news.ycombinator.com/best",
+        };
+
+        // len = sizeof(shortcuts) / sizeof(shortcuts[0]);
+        len = sizeof(shortcuts) / sizeof(char *);
+
+        for (int i = 0; i < len; i++) {
+            int replace_check = str_replace_start(tmp_uri, shortcuts[i],
+                expansions[i], output);
+            if (replace_check == 2) {
+#ifdef DEBUG
+                printf("tmp_uri: %s\n", tmp_uri);
+                printf("output: %s\n", output);
+#endif
+                return 2;
+            } else if (replace_check == 1) {
+#ifdef DEBUG
+                printf("replace_check failed\n");
+#endif
+                return 1;
+            }
+            strcpy(tmp_uri, output);
+            str_init(output, l2);
+        }
+        strcpy(output, tmp_uri);
+    }
+#ifdef DEBUG
+    printf("No match found\n\n");
+#endif
+    return 0;
+}

plugins/shortcuts/shortcuts.h

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+#pragma once
+
+#define SHORTCUT_N 20
+
+int shortcut_expand(const char* uri, char* output);
+void str_init(char* str, int n);