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mothra: linkify text starting with gemini:// and ftp://

--- a/sys/src/cmd/mothra/rdhtml.c

+++ b/sys/src/cmd/mothra/rdhtml.c

@@ -35,6 +35,16 @@

 	"lucidasans/typeunicode.16", 0, 0,

 };

+static struct{

+	char *prefix;

+	int len;

+}links[]={

+	{"http://", 7},

+	{"https://", 8},

+	{"gemini://", 9},

+	{"ftp://", 6},

+};

+

 Font *pl_whichfont(int f, int s, int *space){

 	char name[NNAME];

@@ -296,12 +306,12 @@

 /* return url if text token looks like a hyperlink */

 char *linkify(char *s){

+	int i;

 	if(s == 0 && s[0] == 0)

 		return 0;

-	if(!cistrncmp(s, "http://", 7))

-		return strdup(s);

-	if(!cistrncmp(s, "https://", 8))

-		return strdup(s);

+	for(i = 0; i < nelem(links); i++)

+		if(!cistrncmp(s, links[i].prefix, links[i].len))

+			return strdup(s);

 	if(!cistrncmp(s, "www.", 4)){

 		int d, i;