Add --properties-separator option (#1951)

This commit adds the --properties-separator option, which lets users
specify the separator used between keys and values in the properties
output format. This is done by adjusting the value of
github.com/magiconair/properties#Properties.WriteSeparator at encode
time.

Some refactoring of the properties encoder unit tests was done to make
it easier to write unit tests that include different separator values.

Fixes: #1864

Signed-off-by: Ryan Drew <ryan.drew@isovalent.com>

cmd/root.go

@@ -120,6 +120,8 @@ yq -P -oy sample.json
 	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.UnquotedKeys, "lua-unquoted", yqlib.ConfiguredLuaPreferences.UnquotedKeys, "output unquoted string keys (e.g. {foo=\"bar\"})")
 	rootCmd.PersistentFlags().BoolVar(&yqlib.ConfiguredLuaPreferences.Globals, "lua-globals", yqlib.ConfiguredLuaPreferences.Globals, "output keys as top-level global variables")
 
+	rootCmd.PersistentFlags().StringVar(&yqlib.ConfiguredPropertiesPreferences.KeyValueSeparator, "properties-separator", yqlib.ConfiguredPropertiesPreferences.KeyValueSeparator, "separator to use between keys and values")
+
 	rootCmd.PersistentFlags().BoolVarP(&nullInput, "null-input", "n", false, "Don't read input, simply evaluate the expression given. Useful for creating docs from scratch.")
 	rootCmd.PersistentFlags().BoolVarP(&noDocSeparators, "no-doc", "N", false, "Don't print document separators (---)")
 

cmd/utils.go

@@ -187,7 +187,7 @@ func createEncoder(format yqlib.PrinterOutputFormat) (yqlib.Encoder, error) {
 	case yqlib.JSONOutputFormat:
 		return yqlib.NewJSONEncoder(indent, colorsEnabled, unwrapScalar), nil
 	case yqlib.PropsOutputFormat:
-		return yqlib.NewPropertiesEncoder(unwrapScalar), nil
+		return yqlib.NewPropertiesEncoder(unwrapScalar, yqlib.ConfiguredPropertiesPreferences), nil
 	case yqlib.CSVOutputFormat:
 		return yqlib.NewCsvEncoder(yqlib.ConfiguredCsvPreferences), nil
 	case yqlib.TSVOutputFormat: