Add option to remove file from gist

pkg/cmd/gist/edit/edit.go

@@ -32,11 +32,12 @@ type EditOptions struct {
 
 	Edit func(string, string, string, *iostreams.IOStreams) (string, error)
 
-	Selector     string
-	EditFilename string
-	AddFilename  string
-	SourceFile   string
-	Description  string
+	Selector       string
+	EditFilename   string
+	AddFilename    string
+	RemoveFilename string
+	SourceFile     string
+	Description    string
 }
 
 func NewCmdEdit(f *cmdutil.Factory, runF func(*EditOptions) error) *cobra.Command {
@@ -82,6 +83,7 @@ func NewCmdEdit(f *cmdutil.Factory, runF func(*EditOptions) error) *cobra.Comman
 	cmd.Flags().StringVarP(&opts.AddFilename, "add", "a", "", "Add a new file to the gist")
 	cmd.Flags().StringVarP(&opts.Description, "desc", "d", "", "New description for the gist")
 	cmd.Flags().StringVarP(&opts.EditFilename, "filename", "f", "", "Select a file to edit")
+	cmd.Flags().StringVarP(&opts.RemoveFilename, "remove-file", "r", "", "Remove a file from the gist")
 
 	return cmd
 }
@@ -187,6 +189,17 @@ func editRun(opts *EditOptions) error {
 		return updateGist(apiClient, host, gist)
 	}
 
+	// Remove a file from the gist
+	if opts.RemoveFilename != "" {
+		files, err := removeFile(gist.Files, opts.RemoveFilename)
+		if err != nil {
+			return err
+		}
+
+		gist.Files = files
+		return updateGist(apiClient, host, gist)
+	}
+
 	filesToUpdate := map[string]string{}
 
 	for {
@@ -337,3 +350,16 @@ func getFilesToAdd(file string, content []byte) (map[string]*shared.GistFile, er
 		},
 	}, nil
 }
+
+func removeFile(files map[string]*shared.GistFile, filename string) (map[string]*shared.GistFile, error) {
+	if _, found := files[filename]; !found {
+		return nil, fmt.Errorf("gist has no file %q", filename)
+	}
+
+	for name := range files {
+		if strings.Compare(name, filename) == 0 {
+			files[name] = nil
+		}
+	}
+	return files, nil
+}

pkg/cmd/gist/edit/edit_test.go

@@ -80,6 +80,14 @@ func TestNewCmdEdit(t *testing.T) {
 				Description: "my new description",
 			},
 		},
+		{
+			name: "remove",
+			cli:  "123 --remove-file cool.md",
+			wants: EditOptions{
+				Selector:       "123",
+				RemoveFilename: "cool.md",
+			},
+		},
 	}
 
 	for _, tt := range tests {
@@ -394,6 +402,63 @@ func Test_editRun(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "remove file, file does not exist",
+			gist: &shared.Gist{
+				ID: "1234",
+				Files: map[string]*shared.GistFile{
+					"sample.txt": {
+						Filename: "sample.txt",
+						Content:  "bwhiizzzbwhuiiizzzz",
+						Type:     "text/plain",
+					},
+				},
+				Owner: &shared.GistOwner{Login: "octocat"},
+			},
+			opts: &EditOptions{
+				RemoveFilename: "sample2.txt",
+			},
+			wantErr: "gist has no file \"sample2.txt\"",
+		},
+		{
+			name: "remove file from existing gist",
+			gist: &shared.Gist{
+				ID: "1234",
+				Files: map[string]*shared.GistFile{
+					"sample.txt": {
+						Filename: "sample.txt",
+						Content:  "bwhiizzzbwhuiiizzzz",
+						Type:     "text/plain",
+					},
+					"sample2.txt": {
+						Filename: "sample2.txt",
+						Content:  "bwhiizzzbwhuiiizzzz",
+						Type:     "text/plain",
+					},
+				},
+				Owner: &shared.GistOwner{Login: "octocat"},
+			},
+			httpStubs: func(reg *httpmock.Registry) {
+				reg.Register(httpmock.REST("POST", "gists/1234"),
+					httpmock.StatusStringResponse(201, "{}"))
+			},
+			opts: &EditOptions{
+				RemoveFilename: "sample2.txt",
+			},
+			wantParams: map[string]interface{}{
+				"description": "",
+				"updated_at":  "0001-01-01T00:00:00Z",
+				"public":      false,
+				"files": map[string]interface{}{
+					"sample.txt": map[string]interface{}{
+						"filename": "sample.txt",
+						"content":  "bwhiizzzbwhuiiizzzz",
+						"type":     "text/plain",
+					},
+					"sample2.txt": nil,
+				},
+			},
+		},
 		{
 			name: "edit gist using file from source parameter",
 			gist: &shared.Gist{