Have made some large improvements

- Added support for multiple cursors
- Enabled wrapping
- Added uppercase, lowercase, and lorem ipsum support
- Added support for processing only selected ranges

textfilters.go

@@ -1,22 +1,46 @@
 package main
 
 import (
+	"bufio"
 	"bytes"
 	"encoding/json"
 	"strconv"
+	"strings"
 )
 
 type TextFilter func(input string) (output string, err error)
 
 var TextFilters = map[string]TextFilter{
+	"upper-case": func(input string) (output string, err error) {
+		return strings.ToUpper(input), nil
+	},
+	"lower-case": func(input string) (output string, err error) {
+		return strings.ToLower(input), nil
+	},
 	"unquote": func(input string) (output string, err error) {
 		return strconv.Unquote(input)
 	},
 	"format-json": func(input string) (output string, err error) {
 		var dst bytes.Buffer
-		if err := json.Indent(&dst, []byte(input), "", "  "); err != nil {
-			return "", err
+
+		scnr := bufio.NewScanner(strings.NewReader(input))
+		for scnr.Scan() {
+			line := scnr.Text()
+			if err := json.Indent(&dst, []byte(line), "", "  "); err == nil {
+				dst.WriteString("\n")
+			} else {
+				return "", err
+			}
 		}
+
 		return dst.String(), nil
 	},
+	"lorem-ipsum": func(input string) (output string, err error) {
+		return "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor " +
+			"incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud " +
+			"exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure " +
+			"dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. " +
+			"Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt " +
+			"mollit anim id est laborum.", nil
+	},
 }