[xdg-desktop-portal-gnome/gbsneto/screencast-session-restore: 8/10] displaystatetracker: Add match string

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 36594e191980d84ca77ba09faddf3f160a9839cf
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Sep 28 21:00:35 2021 -0300

    displaystatetracker: Add match string
    
    The monitor's match string is a unique string that can be used to compare
    monitors and check for equality. It's composed of the product, vendor, and
    serial numbers. It'll be used by the next commit to restore sessions.

 src/displaystatetracker.c | 18 +++++++++++++++---
 src/displaystatetracker.h |  2 ++
 2 files changed, 17 insertions(+), 3 deletions(-)
---
diff --git a/src/displaystatetracker.c b/src/displaystatetracker.c
index 6affd8a..fc9109e 100644
--- a/src/displaystatetracker.c
+++ b/src/displaystatetracker.c
@@ -35,6 +35,7 @@ static guint signals[N_SIGNALS];
 typedef struct _Monitor
 {
   char *connector;
+  char *match_string;
   char *display_name;
 } Monitor;
 
@@ -65,6 +66,7 @@ static void
 monitor_free (Monitor *monitor)
 {
   g_free (monitor->connector);
+  g_free (monitor->match_string);
   g_free (monitor->display_name);
   g_free (monitor);
 }
@@ -75,6 +77,12 @@ monitor_get_connector (Monitor *monitor)
   return monitor->connector;
 }
 
+const char *
+monitor_get_match_string (Monitor *monitor)
+{
+  return monitor->match_string;
+}
+
 const char *
 monitor_get_display_name (Monitor *monitor)
 {
@@ -109,6 +117,9 @@ generate_monitors (DisplayStateTracker *tracker,
   g_variant_iter_init (&monitors_iter, monitors);
   while ((monitor_variant = g_variant_iter_next_value (&monitors_iter)))
     {
+      g_autofree char *vendor = NULL;
+      g_autofree char *product = NULL;
+      g_autofree char *serial = NULL;
       Monitor *monitor;
       char *connector;
       char *display_name;
@@ -116,9 +127,9 @@ generate_monitors (DisplayStateTracker *tracker,
 
       g_variant_get (monitor_variant, "((ssss)a(siiddada{sv})@a{sv})",
                      &connector,
-                     NULL /* vendor */,
-                     NULL /* product */,
-                     NULL /* serial */,
+                     &vendor,
+                     &product,
+                     &serial,
                      NULL /* modes */,
                      &properties);
 
@@ -128,6 +139,7 @@ generate_monitors (DisplayStateTracker *tracker,
       monitor = g_new0 (Monitor, 1);
       *monitor = (Monitor) {
         .connector = connector,
+        .match_string = g_strdup_printf ("%s:%s:%s", vendor, product, serial),
         .display_name = display_name
       };
 
diff --git a/src/displaystatetracker.h b/src/displaystatetracker.h
index 54c63fa..1c3a7dc 100644
--- a/src/displaystatetracker.h
+++ b/src/displaystatetracker.h
@@ -28,6 +28,8 @@ G_DECLARE_FINAL_TYPE (DisplayStateTracker, display_state_tracker,
 
 const char * monitor_get_connector (Monitor *monitor);
 
+const char * monitor_get_match_string (Monitor *monitor);
+
 const char * monitor_get_display_name (Monitor *monitor);
 
 GList * logical_monitor_get_monitors (LogicalMonitor *logical_monitor);