Allow binding mouse buttons

Instead of hardcoding mouse button actions, allow the user to
bind mouse buttons to extended commands.  For example the new
defaults are:

BIND=mouse1:therecmdmenu
BIND=mouse2:clicklook

Currently a bit rudimentary; the defaults should be OK, but
documentation is bit lacking, and in-game binding and option
saving are missing.

Allowed commands to bind are "nothing", "therecmdmenu", "clicklook",
and "mouseaction". Clicklook replaces the "clicklook" boolean option,
and mouseaction does what mouse 1 button used to do - a context sensitive
action.

include/decl.h

@@ -506,6 +506,7 @@ struct cmd {
     const char *dirchars;      /* current movement/direction characters */
     const char *alphadirchars; /* same as dirchars if !numpad */
     const struct ext_func_tab *commands[256]; /* indexed by input character */
+    const struct ext_func_tab *mousebtn[NUM_MOUSE_BUTTONS];
     char spkeys[NUM_NHKF];
     char extcmd_char;      /* key that starts an extended command ('#') */
 };

include/extern.h

@@ -279,6 +279,7 @@ extern void rhack(char *);
 extern int doextlist(void);
 extern int extcmd_via_menu(void);
 extern int enter_explore_mode(void);
+extern boolean bind_mousebtn(int, const char *);
 extern boolean bind_key(uchar, const char *);
 extern void dokeylist(void);
 extern coordxy xytod(coordxy, coordxy);
@@ -291,7 +292,7 @@ extern const char *directionname(int);
 extern int isok(coordxy, coordxy);
 extern int get_adjacent_loc(const char *, const char *, coordxy, coordxy,
                             coord *);
-extern const char *click_to_cmd(coordxy, coordxy, int);
+extern void click_to_cmd(coordxy, coordxy, int);
 extern char get_count(const char *, char, long, cmdcount_nht *, unsigned);
 #ifdef HANGUPHANDLING
 extern void hangup(int);

include/flag.h

@@ -318,7 +318,6 @@ struct instance_flags {
 #ifdef TTY_SOUND_ESCCODES
     boolean vt_sounddata;    /* output console codes for sound support in TTY*/
 #endif
-    boolean clicklook;       /* allow right-clicking for look */
     boolean cmdassist;       /* provide detailed assistance for some comnds */
     boolean fireassist;      /* autowield launcher when using fire-command */
     boolean time_botl;       /* context.botl for 'time' (moves) only */

include/func_tab.h

@@ -19,6 +19,7 @@
 #define CMD_MOVE_PREFIXES  (CMD_M_PREFIX | CMD_gGF_PREFIX)
 #define PREFIXCMD    0x0200 /* prefix command, requires another one after it */
 #define MOVEMENTCMD  0x0400 /* used to move hero/cursor */
+#define MOUSECMD     0x0800 /* cmd allowed to be bound to mouse button */
 
 /* flags for extcmds_match() */
 #define ECM_NOFLAGS       0

include/optlist.h

@@ -162,8 +162,6 @@ static int optfn_##a(int, int, boolean, char *, char *);
     NHOPTB(checkpoint, Advanced, 0, opt_out, set_in_config,
                 Off, No, No, No, NoAlias, (boolean *) 0)
 #endif
-    NHOPTB(clicklook, Advanced, 0, opt_in, set_in_game,
-                Off, Yes, No, No, NoAlias, &iflags.clicklook)
     NHOPTB(cmdassist, Behavior, 0, opt_out, set_in_game,
                 On, Yes, No, No, NoAlias, &iflags.cmdassist)
     NHOPTB(color, Map, 0, opt_in, set_in_game,

include/wintype.h

@@ -135,6 +135,7 @@ typedef struct gi {
 /* nh_poskey() modifier types */
 #define CLICK_1 1
 #define CLICK_2 2
+#define NUM_MOUSE_BUTTONS 2
 
 /* invalid winid */
 #define WIN_ERR ((winid) -1)