tools: list the kernel name together with the event node

This changes the YAML output of libwacom-list-local-devices but I'm
assuming no-one uses this anyway. The new output lists the device name
together with the kernel name, e.g.

```
  devices:
  - name: 'Wacom Intuos Pro M'
    bus: 'usb'
    vid: '0x056a'
    pid: '0x0357'
    nodes:
    - /dev/input/event21: 'Wacom Intuos Pro M Finger'
    - /dev/input/event20: 'Wacom Intuos Pro M Pad'
    - /dev/input/event19: 'Wacom Intuos Pro M Pen'
```

This output should make it easier to associate duplicate entries with
their respective event node.

Fixes #558

1 files changed, 20 insertions, 3 deletions

diff --git a/tools/list-local-devices.c b/tools/list-local-devices.c
index 2f2c043..8920c34 100644
--- a/tools/list-local-devices.c
+++ b/tools/list-local-devices.c
@@ -90,9 +90,26 @@ tablet_print(gpointer data, gpointer user_data)
 }
 
 static void
-print_str(gpointer data, gpointer user_data)
+print_devnode(gpointer data, gpointer user_data)
 {
-	printf("  - %s\n", (char *)data);
+	const gchar *devnode = data;
+	gchar *name = NULL;
+	gsize size;
+	GError *error = NULL;
+
+	gchar *basename = g_path_get_basename(devnode);
+	char *path = g_strdup_printf("/sys/class/input/%s/device/name", basename);
+
+	g_free(basename);
+	if (g_file_get_contents(path, &name, &size, &error)) {
+		printf("  - %s: '%.*s'\n", devnode, (int)(size - 1), name);
+	} else {
+		fprintf(stderr, "%s\n", error->message);
+	}
+	if (error)
+		g_error_free(error);
+	g_free(name);
+	g_free(path);
 }
 
 static void
@@ -119,7 +136,7 @@ tablet_print_yaml(gpointer data, gpointer user_data)
 	printf("  vid: '0x%04x'\n", vid);
 	printf("  pid: '0x%04x'\n", pid);
 	printf("  nodes: \n");
-	g_list_foreach(d->nodes, print_str, NULL);
+	g_list_foreach(d->nodes, print_devnode, NULL);
 }
 
 static void