particle: add an 'on_click_template' to base constructor.

This is intended to be a format-like string, with the possibility to
use tag formatters.

The expanded string will later be passed to the system() call.

particle.c

@@ -8,15 +8,18 @@ particle_default_destroy(struct particle *particle)
 {
     if (particle->deco != NULL)
         particle->deco->destroy(particle->deco);
+    free(particle->on_click_template);
     free(particle);
 }
 
 struct particle *
-particle_common_new(int left_margin, int right_margin)
+particle_common_new(int left_margin, int right_margin,
+                    const char *on_click_template)
 {
     struct particle *p = malloc(sizeof(*p));
     p->left_margin = left_margin;
     p->right_margin = right_margin;
+    p->on_click_template = on_click_template != NULL ? strdup(on_click_template) : NULL;
     p->deco = NULL;
     return p;
 }

particle.h

@@ -7,6 +7,7 @@
 #include "font.h"
 #include "tag.h"
 
+struct bar;
 struct exposable;
 
 struct particle {
@@ -14,6 +15,7 @@ struct particle {
 
     int left_margin, right_margin;
     struct deco *deco;
+    char *on_click_template;
 
     void (*destroy)(struct particle *particle);
     struct exposable *(*instantiate)(const struct particle *particle,
@@ -30,6 +32,7 @@ struct exposable {
     void *private;
 
     int width; /* Should be set by begin_expose(), at latest */
+    char *on_click;
 
     void (*destroy)(struct exposable *exposable);
     int (*begin_expose)(struct exposable *exposable, cairo_t *cr);
@@ -40,7 +43,8 @@ struct exposable {
                      enum mouse_event event, int x, int y);
 };
 
-struct particle *particle_common_new(int left_margin, int right_margin);
+struct particle *particle_common_new(int left_margin, int right_margin,
+                                     const char *on_click_template);
 void particle_default_destroy(struct particle *particle);
 
 struct exposable *exposable_common_new(

particles/empty.c

@@ -30,7 +30,7 @@ instantiate(const struct particle *particle, const struct tag_set *tags)
 struct particle *
 particle_empty_new(int left_margin, int right_margin)
 {
-    struct particle *particle = particle_common_new(left_margin, right_margin);
+    struct particle *particle = particle_common_new(left_margin, right_margin, NULL);
     particle->destroy = &particle_default_destroy;
     particle->instantiate = &instantiate;
     return particle;

particles/list.c

@@ -123,7 +123,7 @@ particle_list_new(
     for (size_t i = 0; i < count; i++)
         p->particles[i] = particles[i];
 
-    struct particle *particle = particle_common_new(left_margin, right_margin);
+    struct particle *particle = particle_common_new(left_margin, right_margin, NULL);
 
     particle->private = p;
     particle->destroy = &particle_destroy;

particles/map.c

@@ -60,7 +60,7 @@ struct particle *
 particle_map_new(const char *tag, const struct particle_map *particle_map,
                  size_t count, struct particle *default_particle)
 {
-    struct particle *particle = particle_common_new(0, 0);
+    struct particle *particle = particle_common_new(0, 0, NULL);
     particle->destroy = &particle_destroy;
     particle->instantiate = &instantiate;
 

particles/progress_bar.c

@@ -175,7 +175,7 @@ particle_progress_bar_new(const char *tag, int width,
     priv->empty = empty;
     priv->indicator = indicator;
 
-    struct particle *particle = particle_common_new(left_margin, right_margin);
+    struct particle *particle = particle_common_new(left_margin, right_margin, NULL);
     particle->private = priv;
     particle->destroy = &particle_destroy;
     particle->instantiate = &instantiate;

particles/ramp.c

@@ -61,7 +61,7 @@ instantiate(const struct particle *particle, const struct tag_set *tags)
 struct particle *
 particle_ramp_new(const char *tag, struct particle *particles[], size_t count)
 {
-    struct particle *particle = particle_common_new(0, 0);
+    struct particle *particle = particle_common_new(0, 0, NULL);
     particle->destroy = &particle_destroy;
     particle->instantiate = &instantiate;