support conditionally set scheme

- requires libcurl 8.9.0: the feature is called "no-guess-scheme"
- -v now lists all features in alphabetical order

Added test cases for setting scheme conditionally

Fixes #296
Closes #314

tests.json

@@ -2572,5 +2572,34 @@
           "returncode": 10,
           "stdout": ""
       }
+  },
+  {
+      "required": ["no-guess-scheme"],
+      "input": {
+          "arguments": [
+              "example.com",
+              "--set",
+              "scheme?=https"
+          ]
+      },
+      "expected": {
+          "stdout": "https://example.com/\n",
+          "stderr": "",
+          "returncode": 0
+      }
+  },
+  {
+      "input": {
+          "arguments": [
+              "ftp://example.com",
+              "--set",
+              "scheme?=https"
+          ]
+      },
+      "expected": {
+          "stdout": "ftp://example.com/\n",
+          "stderr": "",
+          "returncode": 0
+      }
   }
 ]

trurl.c

@@ -72,6 +72,11 @@ typedef enum {
 #if CURL_AT_LEAST_VERSION(7,30,0)
 #define SUPPORTS_IMAP_OPTIONS
 #endif
+#if CURL_AT_LEAST_VERSION(8,9,0)
+#define SUPPORTS_NO_GUESS_SCHEME
+#else
+#define CURLU_NO_GUESS_SCHEME 0
+#endif
 
 #define OUTPUT_URL      0  /* default */
 #define OUTPUT_SCHEME   1
@@ -276,30 +281,33 @@ static void show_version(void)
   fprintf(stdout, "%s version %s libcurl/%s [built-with %s]\n",
           PROGNAME, TRURL_VERSION_TXT, data->version, LIBCURL_VERSION);
   fprintf(stdout, "features:");
-#ifdef SUPPORTS_PUNYCODE
-  if(supports_puny)
-    fprintf(stdout, " punycode");
-#endif
-#ifdef SUPPORTS_ALLOW_SPACE
-  fprintf(stdout, " white-space");
-#endif
-#ifdef SUPPORTS_ZONEID
-  fprintf(stdout, " zone-id");
+#ifdef SUPPORTS_IMAP_OPTIONS
+  if(supports_imap)
+    fprintf(stdout, " imap-options");
 #endif
-#ifdef SUPPORTS_URL_STRERROR
-  fprintf(stdout, " url-strerror");
+#ifdef SUPPORTS_NO_GUESS_SCHEME
+  fprintf(stdout, "no-guess-scheme");
 #endif
 #ifdef SUPPORTS_NORM_IPV4
   fprintf(stdout, " normalize-ipv4");
 #endif
-#ifdef SUPPORTS_IMAP_OPTIONS
-  if(supports_imap)
-    fprintf(stdout, " imap-options");
+#ifdef SUPPORTS_PUNYCODE
+  if(supports_puny)
+    fprintf(stdout, " punycode");
 #endif
 #ifdef SUPPORTS_PUNY2IDN
   if(supports_puny)
     fprintf(stdout, " punycode2idn");
 #endif
+#ifdef SUPPORTS_URL_STRERROR
+  fprintf(stdout, " url-strerror");
+#endif
+#ifdef SUPPORTS_ALLOW_SPACE
+  fprintf(stdout, " white-space");
+#endif
+#ifdef SUPPORTS_ZONEID
+  fprintf(stdout, " zone-id");
+#endif
 
   fprintf(stdout, "\n");
   exit(0);
@@ -982,7 +990,7 @@ static const struct var *setone(CURLU *uh, const char *setline,
 
       if(conditional) {
         char *piece;
-        rc = curl_url_get(uh, v->part, &piece, 0);
+        rc = curl_url_get(uh, v->part, &piece, CURLU_NO_GUESS_SCHEME);
         if(!rc) {
           skip = true;
           curl_free(piece);