swaybar: Add support for Airblade i3bar extensions

This extends the i3bar protocol implementation with the following
features from @Airblade/i3:

* background
* border
* border_top, border_bottom, border_left, border_right

A block will now be rendered like this:

```
(border_left + margin) + width + (margin + border_right) + sep
```

Where `border_left/border_right` and their related margin is only drawn
if the `border` is specified and the border has a width > 0 (default is
1).

`border_top` and `border_bottom` does not affect the height of the bar
(no margin is added), thus it will be drawn behind the text if it is too
big. The user should specify a bar height if more space between
top/bottom borders are required.

1 files changed, 235 insertions, 66 deletions

diff --git a/swaybar/main.c b/swaybar/main.c
index 434d7363..c9fc7de7 100644
--- a/swaybar/main.c
+++ b/swaybar/main.c
@@ -54,6 +54,13 @@ struct status_block {
         char *name, *instance;
         bool separator;
         int separator_block_width;
+        // Airblader features
+        uint32_t background;
+        uint32_t border;
+        int border_top;
+        int border_bottom;
+        int border_left;
+        int border_right;
 };
 
 list_t *status_line = NULL;
@@ -397,7 +404,185 @@ void bar_ipc_init(int outputi, const char *bar_id) {
         ipc_update_workspaces();
 }
 
+/**
+ * Renders a sharp line of any width and height.
+ *
+ * The line is drawn from (x,y) to (x+width,y+height) where width/height is 0
+ * if the line has a width/height of one pixel, respectively.
+ */
+void render_sharp_line(cairo_t *cairo, uint32_t color, double x, double y, double width, double height) {
+        cairo_set_source_u32(cairo, color);
+
+        if (width > 1 && height > 1) {
+                cairo_rectangle(cairo, x, y, width, height);
+                cairo_fill(cairo);
+        } else {
+                if (width == 1) {
+                        x += 0.5;
+                        height += y;
+                        width = x;
+                }
+
+                if (height == 1) {
+                        y += 0.5;
+                        width += x;
+                        height = y;
+                }
+
+                cairo_move_to(cairo, x, y);
+                cairo_set_line_width(cairo, 1.0);
+                cairo_line_to(cairo, width, height);
+                cairo_stroke(cairo);
+        }
+}
+
+void render_block(struct status_block *block, double *x, bool edge) {
+        int width, height;
+        get_text_size(window, &width, &height, "%s", block->full_text);
+
+        int textwidth = width;
+        double block_width = width;
+
+        if (width < block->min_width) {
+                width = block->min_width;
+        }
+
+        *x -= width;
+
+        if (block->border != 0 && block->border_left > 0) {
+                *x -= (block->border_left + margin);
+                block_width += block->border_left + margin;
+        }
+
+        if (block->border != 0 && block->border_right > 0) {
+                *x -= (block->border_right + margin);
+                block_width += block->border_right + margin;
+        }
+
+        // Add separator
+        if (!edge) {
+                *x -= block->separator_block_width;
+        } else {
+                *x -= margin;
+        }
+
+        double pos = *x;
+
+        // render background
+        if (block->background != 0x0) {
+                cairo_set_source_u32(window->cairo, block->background);
+                cairo_rectangle(window->cairo, pos - 0.5, 1, block_width, window->height - 2);
+                cairo_fill(window->cairo);
+        }
+
+        // render top border
+        if (block->border != 0 && block->border_top > 0) {
+                render_sharp_line(window->cairo, block->border,
+                                pos - 0.5,
+                                1,
+                                block_width,
+                                block->border_top);
+        }
+
+        // render bottom border
+        if (block->border != 0 && block->border_bottom > 0) {
+                render_sharp_line(window->cairo, block->border,
+                                pos - 0.5,
+                                window->height - 1 - block->border_bottom,
+                                block_width,
+                                block->border_bottom);
+        }
+
+        // render left border
+        if (block->border != 0 && block->border_left > 0) {
+                render_sharp_line(window->cairo, block->border,
+                                pos - 0.5,
+                                1,
+                                block->border_left,
+                                window->height - 2);
+
+                pos += block->border_left + margin;
+        }
+
+        // render text
+        double offset = 0;
+
+        if (strncmp(block->align, "left", 5) == 0) {
+                offset = pos;
+        } else if (strncmp(block->align, "right", 5) == 0) {
+                offset = pos + width - textwidth;
+        } else if (strncmp(block->align, "center", 6) == 0) {
+                offset = pos + (width - textwidth) / 2;
+        }
+
+        cairo_move_to(window->cairo, offset, margin);
+        cairo_set_source_u32(window->cairo, block->color);
+        pango_printf(window, "%s", block->full_text);
+
+        pos += width;
+
+        // render right border
+        if (block->border != 0 && block->border_right > 0) {
+                pos += margin;
+
+                render_sharp_line(window->cairo, block->border,
+                                pos - 0.5,
+                                1,
+                                block->border_right,
+                                window->height - 2);
+
+                pos += block->border_right;
+        }
+
+        // render separator
+        // TODO: Handle custom separator
+        if (!edge && block->separator) {
+                cairo_set_source_u32(window->cairo, colors.separator);
+                cairo_set_line_width(window->cairo, 1);
+                cairo_move_to(window->cairo, pos + block->separator_block_width/2, margin);
+                cairo_line_to(window->cairo, pos + block->separator_block_width/2, window->height - margin);
+                cairo_stroke(window->cairo);
+        }
+
+}
+
+void render_workspace_button(struct workspace *ws, double *x) {
+        int width, height;
+        get_text_size(window, &width, &height, "%s", ws->name);
+        struct box_colors box_colors;
+        if (ws->urgent) {
+                box_colors = colors.urgent_workspace;
+        } else if (ws->focused) {
+                box_colors = colors.focused_workspace;
+        } else if (ws->visible) {
+                box_colors = colors.active_workspace;
+        } else {
+                box_colors = colors.inactive_workspace;
+        }
+
+        // background
+        cairo_set_source_u32(window->cairo, box_colors.background);
+        cairo_rectangle(window->cairo, *x, 1.5, width + ws_hor_padding * 2 - 1,
+                        height + ws_ver_padding * 2);
+        cairo_fill(window->cairo);
+
+        // border
+        cairo_set_source_u32(window->cairo, box_colors.border);
+        cairo_rectangle(window->cairo, *x, 1.5, width + ws_hor_padding * 2 - 1,
+                        height + ws_ver_padding * 2);
+        cairo_stroke(window->cairo);
+
+        // text
+        cairo_set_source_u32(window->cairo, box_colors.text);
+        cairo_move_to(window->cairo, (int)*x + ws_hor_padding, margin);
+        pango_printf(window, "%s", ws->name);
+
+        *x += width + ws_hor_padding * 2 + ws_spacing;
+}
+
 void render() {
+        int i;
+
         // Clear
         cairo_save(window->cairo);
         cairo_set_operator(window->cairo, CAIRO_OPERATOR_CLEAR);
@@ -417,49 +602,13 @@ void render() {
                 cairo_move_to(window->cairo, window->width - margin - width, margin);
                 pango_printf(window, "%s", line);
         } else if (protocol == I3BAR && status_line) {
-                int i, blockpos;
-                int moved = 0;
-                bool corner = true;
+                double pos = window->width - 0.5;
+                bool edge = true;
                 for (i = status_line->length - 1; i >= 0; --i) {
                         struct status_block *block = status_line->items[i];
                         if (block->full_text && block->full_text[0]) {
-                                get_text_size(window, &width, &height, "%s", block->full_text);
-
-                                int textwidth = width;
-
-                                if (width < block->min_width) {
-                                        width = block->min_width;
-                                }
-
-                                moved += width + block->separator_block_width;
-                                blockpos = window->width - margin - moved;
-
-                                int offset = 0;
-
-                                if (strncmp(block->align, "left", 5) == 0) {
-                                        offset = blockpos;
-                                }
-                                else if (strncmp(block->align, "right", 5) == 0) {
-                                        offset = blockpos + width - textwidth;
-                                }
-                                else if (strncmp(block->align, "center", 6) == 0) {
-                                        offset = blockpos + (width - textwidth) / 2;
-                                }
-
-                                cairo_move_to(window->cairo, offset, margin);
-                                cairo_set_source_u32(window->cairo, block->color);
-                                pango_printf(window, "%s", block->full_text);
-                                if (corner) {
-                                        corner = false;
-                                } else if (block->separator) {
-                                        cairo_set_source_u32(window->cairo, colors.separator);
-                                        cairo_set_line_width(window->cairo, 1);
-                                        cairo_move_to(window->cairo, blockpos + width
-                                                                + block->separator_block_width/2, margin);
-                                        cairo_line_to(window->cairo, blockpos + width
-                                                                + block->separator_block_width/2, window->height - margin);
-                                        cairo_stroke(window->cairo);
-                                }
+                                render_block(block, &pos, edge);
+                                edge = false;
                         }
                 }
         }
@@ -467,34 +616,9 @@ void render() {
         // Workspaces
         cairo_set_line_width(window->cairo, 1.0);
         double x = 0.5;
-        int i;
         for (i = 0; i < workspaces->length; ++i) {
                 struct workspace *ws = workspaces->items[i];
-                get_text_size(window, &width, &height, "%s", ws->name);
-                struct box_colors box_colors;
-                if (ws->urgent) {
-                        box_colors = colors.urgent_workspace;
-                } else if (ws->focused) {
-                        box_colors = colors.focused_workspace;
-                } else if (ws->visible) {
-                        box_colors = colors.active_workspace;
-                } else {
-                        box_colors = colors.inactive_workspace;
-                }
-
-                cairo_set_source_u32(window->cairo, box_colors.background);
-                cairo_rectangle(window->cairo, x, 1.5, width + ws_hor_padding * 2 - 1, height + ws_ver_padding * 2);
-                cairo_fill(window->cairo);
-
-                cairo_set_source_u32(window->cairo, box_colors.border);
-                cairo_rectangle(window->cairo, x, 1.5, width + ws_hor_padding * 2 - 1, height + ws_ver_padding * 2);
-                cairo_stroke(window->cairo);
-
-                cairo_set_source_u32(window->cairo, box_colors.text);
-                cairo_move_to(window->cairo, (int)x + ws_hor_padding, margin);
-                pango_printf(window, "%s", ws->name);
-
-                x += width + ws_hor_padding * 2 + ws_spacing;
+                render_workspace_button(ws, &x);
         }
 }
 
@@ -543,6 +667,8 @@ void parse_json(const char *text) {
         for (i = 0; i < json_object_array_length(results); ++i) {
                 json_object *full_text, *short_text, *color, *min_width, *align, *urgent;
                 json_object *name, *instance, *separator, *separator_block_width;
+                json_object *background, *border, *border_top, *border_bottom;
+                json_object *border_left, *border_right;
 
                 json_object *json = json_object_array_get_idx(results, i);
                 if (!json) {
@@ -559,6 +685,12 @@ void parse_json(const char *text) {
                 json_object_object_get_ex(json, "instance", &instance);
                 json_object_object_get_ex(json, "separator", &separator);
                 json_object_object_get_ex(json, "separator_block_width", &separator_block_width);
+                json_object_object_get_ex(json, "background", &background);
+                json_object_object_get_ex(json, "border", &border);
+                json_object_object_get_ex(json, "border_top", &border_top);
+                json_object_object_get_ex(json, "border_bottom", &border_bottom);
+                json_object_object_get_ex(json, "border_left", &border_left);
+                json_object_object_get_ex(json, "border_right", &border_right);
 
                 struct status_block *new = malloc(sizeof(struct status_block));
                 memset(new, 0, sizeof(struct status_block));
@@ -623,6 +755,43 @@ void parse_json(const char *text) {
                         new->separator_block_width = 9; // i3bar spec
                 }
 
+                // Airblader features
+                if (background) {
+                        new->background = parse_color(json_object_get_string(background));
+                } else {
+                        new->background = 0x0; // transparent
+                }
+
+                if (border) {
+                        new->border = parse_color(json_object_get_string(border));
+                } else {
+                        new->border = 0x0; // transparent
+                }
+
+                if (border_top) {
+                        new->border_top = json_object_get_int(border_top);
+                } else {
+                        new->border_top = 1;
+                }
+
+                if (border_bottom) {
+                        new->border_bottom = json_object_get_int(border_bottom);
+                } else {
+                        new->border_bottom = 1;
+                }
+
+                if (border_left) {
+                        new->border_left = json_object_get_int(border_left);
+                } else {
+                        new->border_left = 1;
+                }
+
+                if (border_right) {
+                        new->border_right = json_object_get_int(border_right);
+                } else {
+                        new->border_right = 1;
+                }
+
                 list_add(status_line, new);
         }