[hackers] [st] Make selection consistent over line breaks. || Colona

[git]

commit 2323e962e6bcddba42fd8be977088fb63ed8844c
Author: Colona <col...@ycc.fr>
Date:   Tue Jun 3 04:34:58 2014 +0200

    Make selection consistent over line breaks.
    
    Currently, selection is expanded to the end of the line over line breaks 
only in
    regular selection mode, when the line in not empty and when going down 
and/or
    right. This covers all the cases including word selection mode, with the
    exception of rectangular selection because it would make this mode too 
rigid.
    This adjustment is made in selsort so I renamed it to selnormalize to better
    reflect what it does now.
    
    Signed-off-by: Roberto E. Vargas Caballero <k...@shike2.com>

diff --git a/st.c b/st.c
index 11d01df..9a41c5b 100644
--- a/st.c
+++ b/st.c
@@ -441,7 +441,7 @@ static void selclear(XEvent *);
 static void selrequest(XEvent *);
 
 static void selinit(void);
-static void selsort(void);
+static void selnormalize(void);
 static inline bool selected(int, int);
 static char *getsel(void);
 static void selcopy(void);
@@ -657,8 +657,19 @@ y2row(int y) {
        return LIMIT(y, 0, term.row-1);
 }
 
+static int tlinelen(int y) {
+       int i = term.col;
+
+       while (i > 0 && term.line[y][i - 1].c[0] == ' ')
+               --i;
+
+       return i;
+}
+
 static void
-selsort(void) {
+selnormalize(void) {
+       int i;
+
        if(sel.ob.y == sel.oe.y) {
                sel.nb.x = MIN(sel.ob.x, sel.oe.x);
                sel.ne.x = MAX(sel.ob.x, sel.oe.x);
@@ -668,6 +679,15 @@ selsort(void) {
        }
        sel.nb.y = MIN(sel.ob.y, sel.oe.y);
        sel.ne.y = MAX(sel.ob.y, sel.oe.y);
+
+       /* expand selection over line breaks */
+       if (sel.type == SEL_RECTANGULAR)
+               return;
+       i = tlinelen(sel.nb.y);
+       if (i < sel.nb.x)
+               sel.nb.x = i;
+       if (tlinelen(sel.ne.y) <= sel.ne.x)
+               sel.ne.x = term.col - 1;
 }
 
 static inline bool
@@ -683,8 +703,6 @@ selected(int x, int y) {
 
 void
 selsnap(int mode, int *x, int *y, int direction) {
-       int i;
-
        switch(mode) {
        case SNAP_WORD:
                /*
@@ -716,7 +734,7 @@ selsnap(int mode, int *x, int *y, int direction) {
                                continue;
                        }
 
-                       if(strchr(worddelimiters,
+                       if(*x >= tlinelen(*y) || strchr(worddelimiters,
                                        term.line[*y][*x+direction].c[0])) {
                                break;
                        }
@@ -747,18 +765,6 @@ selsnap(int mode, int *x, int *y, int direction) {
                        }
                }
                break;
-       default:
-               /*
-                * Select the whole line when the end of line is reached.
-                */
-               if(direction > 0) {
-                       i = term.col;
-                       while(--i > 0 && term.line[*y][i].c[0] == ' ')
-                               /* nothing */;
-                       if(i > 0 && i < *x)
-                               *x = term.col - 1;
-               }
-               break;
        }
 }
 
@@ -780,7 +786,7 @@ getbuttoninfo(XEvent *e) {
                selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
                selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
        }
-       selsort();
+       selnormalize();
 
        sel.type = SEL_REGULAR;
        for(type = 1; type < LEN(selmasks); ++type) {
@@ -896,7 +902,7 @@ bpress(XEvent *e) {
                }
                selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
                selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
-               selsort();
+               selnormalize();
 
                /*
                 * Draw selection, unless it's regular and we don't want to
@@ -1451,7 +1457,7 @@ selscroll(int orig, int n) {
                                sel.oe.x = term.col;
                        }
                }
-               selsort();
+               selnormalize();
        }
 }