Add ^O series to handle OSC-8 id= search and URIs

cmd.h

@@ -77,6 +77,11 @@
 #define A_X116MOUSE_IN         68
 #define A_PSHELL               69
 #define A_CLR_SEARCH           70
+#define A_OSC8_ID_SEARCH       84
+#define A_OSC8_ID_SEARCH_LOAD  85
+#define A_OSC8_GOTO_P          86
+#define A_OSC8_GOTO_N          87
+#define A_OSC8_OPEN            88
 
 /* These values must not conflict with any A_* or EC_* value. */
 #define A_INVALID              100

command.c

@@ -332,6 +332,12 @@ static void exec_mca(void)
 		if (done_msg != NULL)
 			error(done_msg, NULL_PARG);
 		break; }
+#endif
+#if OSC8_SEARCH
+	case A_OSC8_ID_SEARCH:
+	case A_OSC8_ID_SEARCH_LOAD:
+		osc8_id_search(cbuf, mca == A_OSC8_ID_SEARCH);
+		break;
 #endif
 	}
 }
@@ -2156,6 +2162,32 @@ public void commands(void)
 		case A_NOACTION:
 			break;
 
+#if !OSC8_SEARCH
+		case A_OSC8_ID_SEARCH:
+		case A_OSC8_ID_SEARCH_LOAD:
+		case A_OSC8_GOTO_P:
+		case A_OSC8_GOTO_N:
+		case A_OSC8_OPEN:
+			error("Command not available", NULL_PARG);
+			break;
+#else
+		case A_OSC8_ID_SEARCH:
+		case A_OSC8_ID_SEARCH_LOAD:
+			start_mca(action, "[OSC 8 id]:",
+				(void *)NULL, CF_QUIT_ON_ERASE);
+			c = getcc();
+			goto again;
+		case A_OSC8_GOTO_P:
+			osc8_goto(SRCH_BACK);
+			break;
+		case A_OSC8_GOTO_N:
+			osc8_goto(SRCH_FORW);
+			break;
+		case A_OSC8_OPEN:
+			osc8_open();
+			break;
+#endif /* OSC8_SEARCH */
+
 		default:
 			bell();
 			break;

configure.ac

@@ -560,6 +560,11 @@ AH_TOP([
  */
 #define	LOGFILE		(!SECURE)
 
+/*
+ * OSC8_SEARCH is 1 if you wish to support searching/following OSC8 references.
+ */
+#define	OSC8_SEARCH	(!SECURE)
+
 /*
  * GNU_OPTIONS is 1 if you wish to support the GNU-style command
  * line options --help and --version.

decode.c

@@ -179,7 +179,12 @@ static unsigned char cmdtable[] =
 	'Q',0,                          A_QUIT,
 	':','q',0,                      A_QUIT,
 	':','Q',0,                      A_QUIT,
-	'Z','Z',0,                      A_QUIT
+	'Z','Z',0,                      A_QUIT,
+	CONTROL('O'),CONTROL('I'),0,    A_OSC8_ID_SEARCH,
+	CONTROL('O'),CONTROL('L'),0,    A_OSC8_ID_SEARCH_LOAD,
+	CONTROL('O'),CONTROL('N'),0,    A_OSC8_GOTO_N,
+	CONTROL('O'),CONTROL('P'),0,    A_OSC8_GOTO_P,
+	CONTROL('O'),CONTROL('O'),0,    A_OSC8_OPEN
 };
 
 static unsigned char edittable[] =

defines.ds

@@ -97,6 +97,11 @@
  */
 #define	LOGFILE		(!SECURE)
 
+/*
+ * OSC8_SEARCH is 1 if you wish to support searching/following OSC8 references.
+ */
+#define	OSC8_SEARCH	(!SECURE)
+
 /*
  * GNU_OPTIONS is 1 if you wish to support the GNU-style command
  * line options --help and --version.

defines.o2

@@ -90,6 +90,11 @@
  */
 #define	LOGFILE		(!SECURE)
 
+/*
+ * OSC8_SEARCH is 1 if you wish to support searching/following OSC8 references.
+ */
+#define	OSC8_SEARCH	(!SECURE)
+
 /*
  * GNU_OPTIONS is 1 if you wish to support the GNU-style command
  * line options --help and --version.

defines.o9

@@ -89,6 +89,11 @@
  */
 #define	LOGFILE		(!SECURE)
 
+/*
+ * OSC8_SEARCH is 1 if you wish to support searching/following OSC8 references.
+ */
+#define	OSC8_SEARCH	(!SECURE)
+
 /*
  * GNU_OPTIONS is 1 if you wish to support the GNU-style command
  * line options --help and --version.

defines.wn

@@ -90,6 +90,11 @@
  */
 #define	LOGFILE		(!SECURE)
 
+/*
+ * OSC8_SEARCH is 1 if you wish to support searching/following OSC8 references.
+ */
+#define	OSC8_SEARCH	(!SECURE)
+
 /*
  * GNU_OPTIONS is 1 if you wish to support the GNU-style command
  * line options --help and --version.

less.h

@@ -347,6 +347,14 @@ struct wchar_range_table
 	unsigned int count;
 };
 
+/* State while processing an ANSI escape sequence */
+struct ansi_state
+{
+        int hindex;   /* Index into hyperlink prefix */
+        int hlink;    /* Processing hyperlink address? */
+        int prev_esc; /* Prev char was ESC (to detect ESC-\ seq) */
+};
+
 #if HAVE_POLL
 typedef short POLL_EVENTS;
 #endif
@@ -395,6 +403,9 @@ typedef short POLL_EVENTS;
 #define SRCH_SUBSEARCH(i) (1 << (16+(i))) /* Search for subpattern */
 /* {{ Depends on NUM_SEARCH_COLORS==5 }} */
 #define SRCH_SUBSEARCH_ALL (SRCH_SUBSEARCH(1)|SRCH_SUBSEARCH(2)|SRCH_SUBSEARCH(3)|SRCH_SUBSEARCH(4)|SRCH_SUBSEARCH(5))
+#if OSC8_SEARCH
+# define SRCH_OSC8	(1 << 22) /* OSC 8 id= search */
+#endif
 
 #define SRCH_REVERSE(t) (((t) & SRCH_FORW) ? \
                                 (((t) & ~SRCH_FORW) | SRCH_BACK) : \
@@ -625,7 +636,6 @@ typedef enum {
 struct mlist;
 struct loption;
 struct hilite_tree;
-struct ansi_state;
 #include "pattern.h"
 #include "xbuf.h"
 #include "funcs.h"

less.hlp

@@ -75,6 +75,11 @@
 
   m_<_l_e_t_t_e_r_>            Mark the current top line with <letter>.
   M_<_l_e_t_t_e_r_>            Mark the current bottom line with <letter>.
+  ^O^I_<_i_d_>             Search for an OSC 8 <id> in the file.
+  ^O^P                 Go to previous OSC 8 link.
+  ^O^N                 Go to next OSC 8 link.
+  ^O^O                 Open current OSC 8 link with LESSOSC8OPEN.
+  ^O^L_<_i_d_>             Combined ^O^I plus ^O^O.
   '_<_l_e_t_t_e_r_>            Go to a previously marked position.
   ''                   Go to the previous position.
   ^X^X                 Same as '.

less.nro.VER

@@ -105,6 +105,17 @@ and LEFTARROW commands.
 Scroll horizontally right to show the end of the longest displayed line.
 .IP "ESC-{ or \(haLEFTARROW"
 Scroll horizontally left back to the first column.
+.IP "^O^I"
+Search for an OSC 8 ID in the file.
+.IP "^O^P"
+Go to the previous OSC 8 link.
+.IP "^O^N"
+Go to the next OSC 8 link.
+.IP "^O^O"
+Open the current OSC 8 link with the command specified
+in the LESSOSC8OPEN environment variable.
+.IP "^O^L"
+Combined ^O^I plus ^O^O.
 .IP "r or \(haR or \(haL"
 Repaint the screen.
 .IP R
@@ -2316,6 +2327,11 @@ Enables individual features which are normally disabled by LESSSECURE.
 See discussion under SECURITY.
 .IP LESSSEPARATOR
 String to be appended to a directory name in filename completion.
+.IP LESSOSC8OPEN
+Command line to invoke when following OSC 8 links.
+Without this being set only
+.IR man (1)
+references like "man:ls(1)" can be opened.
 .IP LESSUTFBINFMT
 Format for displaying non-printable Unicode code points.
 .IP LESSUTFCHARDEF 

lesskey.nro.VER

@@ -179,6 +179,11 @@ g	goto-line
 \ekh	goto-line
 <	goto-line
 \ee<	goto-line
+^O^I	osc8-id-search
+^O^L	osc8-id-search-load
+^O^N	osc8-goto-next
+^O^P	osc8-goto-prev
+^O^O	osc8-open
 p	percent
 %	percent
 \ee[	left-scroll

lesskey_parse.c

@@ -72,6 +72,13 @@ static constant struct lesskey_cmdname cmdnames[] =
 	{ "next-tag",             A_NEXT_TAG },
 	{ "noaction",             A_NOACTION },
 	{ "no-scroll",            A_LLSHIFT },
+#if OSC8_SEARCH
+	{ "osc8-id-search",       A_OSC8_ID_SEARCH },
+	{ "osc8-id-search-load",  A_OSC8_ID_SEARCH_LOAD },
+	{ "osc8-goto-next",       A_OSC8_GOTO_N },
+	{ "osc8-goto-prev",       A_OSC8_GOTO_P },
+	{ "osc8-open",            A_OSC8_OPEN },
+#endif
 	{ "percent",              A_PERCENT },
 	{ "pipe",                 A_PIPE },
 	{ "prev-file",            A_PREV_FILE },

line.c

@@ -135,13 +135,6 @@ static struct color_map color_map[] = {
 	{ AT_COLOR_SUBSEARCH(5),   "Wc" },
 };
 
-/* State while processing an ANSI escape sequence */
-struct ansi_state {
-	int hindex;   /* Index into hyperlink prefix */
-	int hlink;    /* Processing hyperlink address? */
-	int prev_esc; /* Prev char was ESC (to detect ESC-\ seq) */
-};
-
 /*
  * Initialize from environment variables.
  */