Add pixel offset

Add a formatting command to offset the text position by a pixel amount.

README.pod

@@ -76,6 +76,10 @@ Aligns the following text to the center of the screen.
 
 Aligns the following text to the right side of the screen.
 
+=item B<O>I<width>
+
+Offset the current position by I<width> pixels in the alignment direction.
+
 =item B<B>I<color>
 
 Set the text background color. The parameter I<color> can be I<-> or a color in one of the formats mentioned before. The special value I<-> resets the color to the default one.

bar.c

@@ -101,10 +101,8 @@ fill_rect (xcb_drawable_t d, xcb_gcontext_t gc, int x, int y, int width, int hei
 }
 
 int
-draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
+shift (monitor_t *mon, int x, int align, int ch_width)
 {
-    int ch_width = cur_font->width_lut[ch - cur_font->char_min].character_width;
-
     switch (align) {
         case ALIGN_C:
             xcb_copy_area(c, mon->pixmap, mon->pixmap, gc[GC_DRAW], mon->width / 2 - x / 2, 0,
@@ -118,8 +116,33 @@ draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
             break;
     }
 
-    /* Draw the background first */
     fill_rect(mon->pixmap, gc[GC_CLEAR], x, by, ch_width, bh);
+    return x;
+}
+
+void
+draw_lines (monitor_t *mon, int x, int w)
+{
+    /* We can render both at the same time */
+    if (attrs & ATTR_OVERL)
+        fill_rect(mon->pixmap, gc[GC_ATTR], x, 0, w, bu);
+    if (attrs & ATTR_UNDERL)
+        fill_rect(mon->pixmap, gc[GC_ATTR], x, bh - bu, w, bu);
+}
+
+void
+draw_shift (monitor_t *mon, int x, int align, int w)
+{
+    x = shift(mon, x, align, w);
+    draw_lines(mon, x, w);
+}
+
+int
+draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
+{
+    int ch_width = cur_font->width_lut[ch - cur_font->char_min].character_width;
+
+    x = shift(mon, x, align, ch_width);
 
     /* xcb accepts string in UCS-2 BE, so swap */
     ch = (ch >> 8) | (ch << 8);
@@ -127,11 +150,7 @@ draw_char (monitor_t *mon, font_t *cur_font, int x, int align, uint16_t ch)
     /* String baseline coordinates */
     xcb_image_text_16(c, 1, mon->pixmap, gc[GC_DRAW], x, bh / 2 + cur_font->height / 2 - cur_font->descent, (xcb_char2b_t *)&ch);
 
-    /* We can render both at the same time */
+    draw_lines(mon, x, ch_width);
-    if (attrs & ATTR_OVERL)
-        fill_rect(mon->pixmap, gc[GC_ATTR], x, 0, ch_width, bu);
-    if (attrs & ATTR_UNDERL)
-        fill_rect(mon->pixmap, gc[GC_ATTR], x, bh - bu, ch_width, bu);
 
     return ch_width;
 }
@@ -358,6 +377,7 @@ parse (char *text)
 
         if (*p == '%' && p++ && *p == '{' && (end = strchr(p++, '}'))) {
             while (p < end) {
+                int w;
                 while (isspace(*p))
                     p++;
 
@@ -409,6 +429,17 @@ parse (char *text)
                               p++;
                               pos_x = 0;
                               break;
+                    case 'O':
+                              errno = 0;
+                              w = (int) strtoul(p, &p, 10);
+                              if (errno)
+                                  continue;
+
+                              draw_shift(cur_mon, pos_x, align, w);
+
+                              pos_x += w;
+                              area_shift(cur_mon->window, align, w);
+                              break;
 
                     /* In case of error keep parsing after the closing } */
                     default: