3 files changed, 74 insertions, 14 deletions

diff --git a/config.def.h b/config.def.h
index d1c20bd..b44fe17 100644
--- a/config.def.h
+++ b/config.def.h
@@ -20,6 +20,9 @@ static bool allowaltscreen = true;
 static unsigned int xfps = 60;
 static unsigned int actionfps = 30;
 
+/* blinking timeout (set to 0 to disable blinking) */
+static unsigned int blinktimeout = 800;
+
 /* TERM value */
 static char termname[] = "st-256color";
 
diff --git a/st.c b/st.c
index 8d27c94..8065ebe 100644
--- a/st.c
+++ b/st.c
@@ -116,6 +116,8 @@ enum term_mode {
         MODE_APPCURSOR   = 2048,
         MODE_MOUSESGR    = 4096,
         MODE_8BIT        = 8192,
+        MODE_BLINK       = 16384,
+        MODE_FBLINK      = 32768,
 };
 
 enum escape_state {
@@ -313,6 +315,7 @@ static void strhandle(void);
 static void strparse(void);
 static void strreset(void);
 
+static int tattrset(int);
 static void tclearregion(int, int, int, int);
 static void tcursor(int);
 static void tdeletechar(int);
@@ -334,6 +337,7 @@ static void tsetchar(char *, Glyph *, int, int);
 static void tsetscroll(int, int);
 static void tswapscreen(void);
 static void tsetdirt(int, int);
+static void tsetdirtattr(int);
 static void tsetmode(bool, bool, int *, int);
 static void tfulldirt(void);
 static void techo(char *, int);
@@ -1175,6 +1179,20 @@ ttyresize(void) {
                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 }
 
+int
+tattrset(int attr) {
+        int i, j;
+
+        for(i = 0; i < term.row-1; i++) {
+                for(j = 0; j < term.col-1; j++) {
+                        if(term.line[i][j].mode & attr)
+                                return 1;
+                }
+        }
+
+        return 0;
+}
+
 void
 tsetdirt(int top, int bot) {
         int i;
@@ -1187,6 +1205,20 @@ tsetdirt(int top, int bot) {
 }
 
 void
+tsetdirtattr(int attr) {
+        int i, j;
+
+        for(i = 0; i < term.row-1; i++) {
+                for(j = 0; j < term.col-1; j++) {
+                        if(term.line[i][j].mode & attr) {
+                                tsetdirt(i, i);
+                                break;
+                        }
+                }
+        }
+}
+
+void
 tfulldirt(void) {
         tsetdirt(0, term.row-1);
 }
@@ -2838,6 +2870,9 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
                 bg = temp;
         }
 
+        if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
+                fg = bg;
+
         /* Intelligent cleaning up of the borders. */
         if(x == 0) {
                 xclear(0, (y == 0)? 0 : winy, borderpx,
@@ -3345,34 +3380,55 @@ void
 run(void) {
         XEvent ev;
         fd_set rfd;
-        int xfd = XConnectionNumber(xw.dpy), xev;
-        struct timeval drawtimeout, *tv = NULL, now, last;
+        int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
+        struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
 
+        gettimeofday(&lastblink, NULL);
         gettimeofday(&last, NULL);
 
         for(xev = actionfps;;) {
                 FD_ZERO(&rfd);
                 FD_SET(cmdfd, &rfd);
                 FD_SET(xfd, &rfd);
-                if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
+
+                switch(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
+                case -1:
                         if(errno == EINTR)
                                 continue;
                         die("select failed: %s\n", SERRNO);
-                }
+                default:
+                        if(FD_ISSET(cmdfd, &rfd)) {
+                                ttyread();
+                                if(blinktimeout) {
+                                        blinkset = tattrset(ATTR_BLINK);
+                                        if(!blinkset && term.mode & ATTR_BLINK)
+                                                term.mode &= ~(MODE_BLINK);
+                                }
+                        }
 
+                        if(FD_ISSET(xfd, &rfd))
+                                xev = actionfps;
+                        break;
+                }
                 gettimeofday(&now, NULL);
                 drawtimeout.tv_sec = 0;
                 drawtimeout.tv_usec = (1000/xfps) * 1000;
                 tv = &drawtimeout;
 
-                if(FD_ISSET(cmdfd, &rfd))
-                        ttyread();
-
-                if(FD_ISSET(xfd, &rfd))
-                        xev = actionfps;
+                dodraw = 0;
+                if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
+                        tsetdirtattr(ATTR_BLINK);
+                        term.mode ^= MODE_BLINK;
+                        gettimeofday(&lastblink, NULL);
+                        dodraw = 1;
+                }
+                if(TIMEDIFF(now, last) \
+                                > (xev? (1000/xfps) : (1000/actionfps))) {
+                        dodraw = 1;
+                        last = now;
+                }
 
-                if(TIMEDIFF(now, last) > \
-                                (xev ? (1000/xfps) : (1000/actionfps))) {
+                if(dodraw) {
                         while(XPending(xw.dpy)) {
                                 XNextEvent(xw.dpy, &ev);
                                 if(XFilterEvent(&ev, None))
@@ -3383,12 +3439,13 @@ run(void) {
 
                         draw();
                         XFlush(xw.dpy);
-                        last = now;
 
                         if(xev && !FD_ISSET(xfd, &rfd))
                                 xev--;
-                        if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd))
+                        if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd) \
+                                        && !blinkset) {
                                 tv = NULL;
+                        }
                 }
         }
 }
diff --git a/st.info b/st.info
index 79b881f..ff01c80 100644
--- a/st.info
+++ b/st.info
@@ -5,7 +5,7 @@ st| simpleterm,
         am,
         bce,
         bel=^G,
-#       blink=\E[5m,
+        blink=\E[5m,
         bold=\E[1m,
         cbt=\E[Z,
         cvvis=\E[?25h,