Move remaining selection mode logic into selextend

The "done" parameter indicates a change which finalizes the selection
(e.g. a mouse button release as opposed to motion).

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

st.c

@@ -167,11 +167,11 @@ static ssize_t xwrite(int, const char *, size_t);
 
 /* Globals */
 Term term;
-Selection sel;
 int cmdfd;
 pid_t pid;
 int oldbutton   = 3; /* button event on startup: 3 = release */
 
+static Selection sel;
 static CSIEscape csiescseq;
 static STREscape strescseq;
 static int iofd = 1;
@@ -402,9 +402,17 @@ selstart(int col, int row, int snap)
 }
 
 void
-selextend(int col, int row, int type)
+selextend(int col, int row, int type, int done)
 {
 	int oldey, oldex, oldsby, oldsey, oldtype;
+
+	if (!sel.mode)
+		return;
+	if (done && sel.mode == SEL_EMPTY) {
+		selclear();
+		return;
+	}
+
 	oldey = sel.oe.y;
 	oldex = sel.oe.x;
 	oldsby = sel.nb.y;
@@ -419,6 +427,8 @@ selextend(int col, int row, int type)
 
 	if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type)
 		tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
+
+	sel.mode = done ? SEL_IDLE : SEL_READY;
 }
 
 void

st.h

@@ -184,7 +184,7 @@ void resettitle(void);
 void selclear(void);
 void selinit(void);
 void selstart(int, int, int);
-void selextend(int, int, int);
+void selextend(int, int, int, int);
 void selnormalize(void);
 int selected(int, int);
 char *getsel(void);
@@ -198,7 +198,6 @@ char *xstrdup(char *);
 
 /* Globals */
 extern Term term;
-extern Selection sel;
 extern int cmdfd;
 extern pid_t pid;
 extern int oldbutton;

x.c

@@ -157,7 +157,7 @@ static void selnotify(XEvent *);
 static void selclear_(XEvent *);
 static void selrequest(XEvent *);
 static void setsel(char *, Time);
-static void mousesel(XEvent *);
+static void mousesel(XEvent *, int);
 static void mousereport(XEvent *);
 static char *kmap(KeySym, uint);
 static int match(uint, uint);
@@ -313,7 +313,7 @@ y2row(int y)
 }
 
 void
-mousesel(XEvent *e)
+mousesel(XEvent *e, int done)
 {
 	int type, seltype = SEL_REGULAR;
 	uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
@@ -324,8 +324,9 @@ mousesel(XEvent *e)
 			break;
 		}
 	}
-
-	selextend(x2col(e->xbutton.x), y2row(e->xbutton.y), seltype);
+	selextend(x2col(e->xbutton.x), y2row(e->xbutton.y), seltype, done);
+	if (done)
+		setsel(getsel(), e->xbutton.time);
 }
 
 void
@@ -630,16 +631,10 @@ brelease(XEvent *e)
 		return;
 	}
 
-	if (e->xbutton.button == Button2) {
+	if (e->xbutton.button == Button2)
 		selpaste(NULL);
-	} else if (e->xbutton.button == Button1) {
-		if (sel.mode == SEL_READY) {
-			mousesel(e);
-			setsel(getsel(), e->xbutton.time);
-		} else
-			selclear_(NULL);
-		sel.mode = SEL_IDLE;
-	}
+	else if (e->xbutton.button == Button1)
+		mousesel(e, 1);
 }
 
 void
@@ -650,11 +645,7 @@ bmotion(XEvent *e)
 		return;
 	}
 
-	if (!sel.mode)
-		return;
-
-	sel.mode = SEL_READY;
-	mousesel(e);
+	mousesel(e, 0);
 }
 
 void