lilo: honor -C when completing labels

completions/lilo

@@ -3,7 +3,8 @@
 _lilo_labels()
 {
     COMPREPLY=( $(compgen -W "$(awk -F'=' '/label/ {print $2}' \
-        /etc/lilo.conf | command sed -e 's/\"//g')" -- "$cur") )
+        ${1:-/etc/lilo.conf} 2>/dev/null | command sed -e 's/\"//g')" \
+        -- "$cur") )
 }
 
 _lilo()
@@ -22,7 +23,14 @@ _lilo()
             ;;
         -I|-D|-R)
             # label completion
-            _lilo_labels
+            local i conf
+            for i in ${!words[@]}; do
+                if [[ ${words[i]} == -C ]]; then
+                    conf=${words[i+1]}
+                    break
+                fi
+            done
+            _lilo_labels $conf
             return
             ;;
         -A|-b|-M|-u|-U)

test/fixtures/lilo/lilo.conf

@@ -0,0 +1,34 @@
+#  global options:
+boot=/dev/hda
+prompt
+timeout=150
+lba32
+compact
+vga=normal
+root=/dev/hda1
+read-only
+menu-title=" John's Computer "
+#
+### bootable kernel images ###
+image=/boot/vmlinuz-2.6.29-1-i386
+     label=try
+     initrd=/boot/initrd.img-2.6.29-1-i386
+image=/boot/vmlinuz-2.4.33-1-i386
+     label=2.4.33
+image=/tamu/vmlinuz
+     label=tamu
+     initrd=/tamu/initrd.img
+     root=/dev/hdb2
+     vga=ask
+#
+### other operating systems ###
+other=/dev/hda3
+     label=PCDOS
+     boot-as=0x80    # must be C:
+other=/dev/hdb1
+     label=WinXP
+     boot-as=0x80    # must be C:
+other=/dev/hdb5
+     label=oldDOS
+     loader=chain
+     table=/dev/hdb5

test/t/test_lilo.py

@@ -5,3 +5,13 @@ class TestLilo:
     @pytest.mark.complete("lilo -")
     def test_1(self, completion):
         assert completion
+
+    @pytest.mark.complete("lilo -C lilo/lilo.conf -D ")
+    def test_labels(self, completion):
+        assert completion == sorted(
+            "try 2.4.33 tamu PCDOS WinXP oldDOS".split()
+        )
+
+    @pytest.mark.complete("lilo -C -D ")
+    def test_labels_incorrect_command(self, completion):
+        assert not completion