Rewrite buggy middle pane logic.

1 files changed, 24 insertions, 47 deletions

diff --git a/pw.c b/pw.c
index a8a8bef..dca5cff 100644
--- a/pw.c
+++ b/pw.c
@@ -399,56 +399,33 @@ static void drawline(pwstate *pw, const char *line, int lineno)
   }
 
   if (vsplit2 > 0) {
-    unsigned pos = line - oline;
-    unsigned delta = vs2pos - pos;
-    if (pos + len <= vs2pos) {
-      unsigned i = vsplit2;
-      if (vsplit1) {
-        hlchar(pw, '|');
-        i--;
-      }
-      for (; i > 0; i--)
-        putchar(' ');
-      columns -= vsplit2;
-      if (len < vsplit2) {
-        line += len;
-        len = 0;
-      } else {
-        len -= vsplit2;
-        line += vsplit2;
-      }
-      endmark = 1;
-    } else if (len - delta <= vsplit2) {
-      unsigned spaces = vsplit2 - (len - delta) + 1;
-      if (vsplit1) {
-        hlchar(pw, '|');
-        delta++;
-      }
-      fputs(line + delta, stdout);
-      for (unsigned i = spaces; i > 0; i--)
-        putchar(' ');
-      columns -= vsplit2;
-      if (len < vsplit2) {
-        line += len;
-        len = 0;
-      } else {
-        len -= vsplit2;
-        line += vsplit2;
-      }
-      endmark = 1;
-    } else {
-      unsigned start = 0;
-      if (vsplit1) {
-        hlchar(pw, '|');
-        start++;
-      }
-      for (unsigned i = start; i < vsplit2; i++)
-        putchar(line[delta + i]);
+    unsigned width = vsplit2;
+    unsigned i = 0;
+
+    if (vsplit1) {
+      hlchar(pw, '|');
+      width--;
+    }
+    if (vs2pos < olen) {
+      unsigned nchar = min(olen - vs2pos, width);
+      const char *ptr = oline + vs2pos;
+      for (; i < nchar; i++)
+        putchar(*ptr++);
+    }
+    for (; i < width; i++)
+      putchar(' ');
+
+    columns -= vsplit2;
+
+    if (len >= vsplit2) {
       line += vsplit2;
       len -= vsplit2;
-      columns -= vsplit2;
-      endmark = 1;
+    } else {
+      line += len;
+      len = 0;
     }
+
+    endmark = 1;
   }
 
   if ((size_t) pw->hpos + 1 <= len) {