[PATCH xinput 3/3] Add --id-only flag for 'xinput list'.

[Peter Hutterer]

The default output of xinput list is hard to parse by scripts. Provide a
--id-only option to print the device ID only, without any other
information.

Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
---
 man/xinput.man |    5 ++++-
 src/list.c     |   13 ++++++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/man/xinput.man b/man/xinput.man
index 035becc..9d7e9a7 100644
--- a/man/xinput.man
+++ b/man/xinput.man
@@ -17,7 +17,7 @@ of the program and the version supported by the server. This option does not
 require a device name.
 .PP
 .TP 8
-.B --list [--short || --long || --name-only] [\fIdevice\fP]
+.B --list [--short || --long || --name-only || --id-only] [\fIdevice\fP]
 If no argument is given list all the input devices. If an argument is given,
 show all the features of \fIdevice\fP.
 If --long is provided, the output includes detailed information about the
@@ -26,6 +26,9 @@ device names and some minimal information is listed.
 If --name-only is provided, the output is limited to the device names. One
 device name is listed per line. Note that the order the devices are listed
 is undefined.
+If --id-only is provided, the output is limited to the device IDs. One
+device ID is listed per line. Note that the order the devices are listed is
+undefined.
 .PP
 .TP 8
 .B --get-feedbacks \fIdevice\fP
diff --git a/src/list.c b/src/list.c
index 0e6f9be..ca3c6bf 100644
--- a/src/list.c
+++ b/src/list.c
@@ -27,7 +27,8 @@
 enum print_format {
     FORMAT_SHORT,
     FORMAT_LONG,
-    FORMAT_NAME
+    FORMAT_NAME,
+    FORMAT_ID,
 };
 
 
@@ -45,6 +46,10 @@ print_info(Display* dpy, XDeviceInfo	*info, enum print_format format)
     {
         printf("%s\n", info->name);
         return;
+    } else if (format == FORMAT_ID)
+    {
+        printf("%ld\n", info->id);
+        return;
     }
 
     printf("\"%s\"\tid=%ld\t[", info->name, info->id);
@@ -203,6 +208,10 @@ print_info_xi2(Display* display, XIDeviceInfo *dev, enum print_format format)
     {
         printf("%s\n", dev->name);
         return;
+    } else if (format == FORMAT_ID)
+    {
+        printf("%d\n", dev->deviceid);
+        return;
     }
 
     printf("%-40s\tid=%d\t[", dev->name, dev->deviceid);
@@ -317,6 +326,8 @@ list(Display	*display,
             format = FORMAT_LONG;
         else if (strcmp(argv[0], "--name-only") == 0)
             format = FORMAT_NAME;
+        else if (strcmp(argv[0], "--id-only") == 0)
+            format = FORMAT_ID;
         arg_dev++;
     }
 
-- 
1.7.3.4