feat(*sum): handle more common checksum filenames

completions/sha256sum

@@ -20,18 +20,20 @@ _comp_cmd_sha256sum()
 
     local sumtype=${1##*/}
     sumtype=${sumtype%sum}
+    local sumglob="@(*.$sumtype|@(check|${sumtype})sums?(.txt))"
 
-    local opt
+    local files opt
     for opt in "${words[@]}"; do
         if [[ $opt == -@(c|-check) ]]; then
-            _comp_compgen_filedir "$sumtype"
+            _comp_compgen -v files filedir &&
+                _comp_compgen -- -X "!$sumglob" -W '"${files[@]}"'
             return
         fi
     done
 
     local files
     _comp_compgen -v files filedir &&
-        _comp_compgen -- -X "*.$sumtype" -W '"${files[@]}"'
+        _comp_compgen -- -X "$sumglob" -W '"${files[@]}"'
 } &&
     complete -F _comp_cmd_sha256sum b2sum md5sum sha{,1,224,256,384,512}sum
 

test/fixtures/sha256sum/checksums

@@ -0,0 +1 @@
+e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  foo

test/fixtures/sha256sum/checksums.txt

@@ -0,0 +1 @@
+e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  foo

test/fixtures/sha256sum/sha256sums

@@ -0,0 +1 @@
+e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  foo

test/fixtures/sha256sum/sha256sums.txt

@@ -0,0 +1 @@
+e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  foo

test/t/test_sha256sum.py

@@ -12,4 +12,10 @@ def test_summing(self, completion):
 
     @pytest.mark.complete("sha256sum -c ", cwd="sha256sum")
     def test_checking(self, completion):
-        assert completion == "foo.sha256"
+        assert completion == [
+            "checksums",
+            "checksums.txt",
+            "foo.sha256",
+            "sha256sums",
+            "sha256sums.txt",
+        ]