qemu: Use _parse_help, add basic test case.

completions/qemu

@@ -102,20 +102,8 @@ _qemu()
 
 
     if [[ "$cur" == -* ]]; then
-        COMPREPLY=( $( compgen -W '-M -fda -fdb -hda -hdb -hdc -hdd \
-            -cdrom -boot -snapshot -no-fd-bootchk -m -smp -nographic -vnc \
-            -k -audio-help -soundhw -localtime -full-screen -pidfile \
-            -daemonize -win2k-hack -option-rom -usb -usbdevice -net -tftp \
-            -smb -redir -kernel -append -initrd -serial -parallel -monitor \
-            -s -p -S -d -hdachs -L -std-vga -no-acpi -no-reboot -loadvm \
-            -semihosting -cpu -bt -vga -drive -startdate -name -curses \
-            -no-frame -no-quit -bootp -echr -no-shutdown -icount -g \
-            -prom-env -help -version -numa -mtdblock -sd -pflash \
-            -device -uuid -alt-grab -sdl -portrait -rtc-td-hack -no-hpet \
-            -balloon -acpitable -smbios -singlestep -gdb -hdachs -bios \
-            -kernel-kqemu -enable-kqemu -enable-kvm -clock -watchdog \
-            -watchdog-action -virtioconsole -show-cursor -tb-size -incoming \
-            -chroot -runas' -- "$cur" ) )
+        COMPREPLY=( $( compgen -W '$( _parse_help "$1" -help ) -fd{a,b}
+            -hd{a..d}' -- "$cur" ) )
     else
         _filedir
     fi

test/completion/qemu.exp

@@ -0,0 +1 @@
+assert_source_completions qemu

test/lib/completions/qemu.exp

@@ -0,0 +1,20 @@
+proc setup {} {
+    save_env
+}
+
+
+proc teardown {} {
+    assert_env_unmodified
+}
+
+
+setup
+
+
+assert_complete_any "qemu "
+
+
+sync_after_int
+
+
+teardown