add output formatting option for replace command

my co-worker noted that its hard to share pastes of the replace commands dry-run output because its colorized. supporting a two-line output of changes with +/- prefixed to denote addition and subtraction for each change is better formatted for sharing.

```
➜ build/vsh_darwin_amd64 -c 'replace -k value myValue KV1/src/a/foo -n'
/KV1/src/a/foo> vmyValue = 1
Skipping write.

➜ build/vsh_darwin_amd64 -c 'replace -k value myValue KV1/src/a/foo -n -o diff'
- /KV1/src/a/foo> value = 1
+ /KV1/src/a/foo> myValue = 1
Skipping write.

```

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master - unreleased
 
+ENHANCEMENTS:
+
+* Add `--output` flag to `replace` command to output as line diffs for each replacement in addition to the default inline format. ([#88](https://github.com/fishi0x01/vsh/pull/88))
+
 BUG FIXES:
 
 * Don't show error on empty line enter in interactive mode ([#85](https://github.com/fishi0x01/vsh/pull/85))

cli/grep.go

@@ -101,7 +101,7 @@ func (cmd *GrepCommand) Run() int {
 			return 1
 		}
 		for _, match := range matches {
-			match.print(os.Stdout, false)
+			match.print(os.Stdout, MatchOutputHighlight)
 		}
 	}
 	return 0

cli/replace.go

@@ -21,15 +21,16 @@ type ReplaceCommand struct {
 
 // ReplaceCommandArgs provides a struct for go-arg parsing
 type ReplaceCommandArgs struct {
-	Search      string `arg:"positional,required"`
-	Replacement string `arg:"positional,required"`
-	Path        string `arg:"positional,required"`
-	Regexp      bool   `arg:"-e,--regexp" help:"Treat search string and selector as a regexp"`
-	KeySelector string `arg:"-s,--key-selector" help:"Limit replacements to specified key" placeholder:"PATTERN"`
-	Keys        bool   `arg:"-k,--keys" help:"Match against keys (true if -v is not specified)"`
-	Values      bool   `arg:"-v,--values" help:"Match against values (true if -k is not specified)"`
-	Confirm     bool   `arg:"-y,--confirm" help:"Write results without prompt"`
-	DryRun      bool   `arg:"-n,--dry-run" help:"Skip writing results without prompt"`
+	Search      string         `arg:"positional,required"`
+	Replacement string         `arg:"positional,required"`
+	Path        string         `arg:"positional,required"`
+	Regexp      bool           `arg:"-e,--regexp" help:"Treat search string and selector as a regexp"`
+	KeySelector string         `arg:"-s,--key-selector" help:"Limit replacements to specified key" placeholder:"PATTERN"`
+	Keys        bool           `arg:"-k,--keys" help:"Match against keys (true if -v is not specified)"`
+	Values      bool           `arg:"-v,--values" help:"Match against values (true if -k is not specified)"`
+	Confirm     bool           `arg:"-y,--confirm" help:"Write results without prompt"`
+	DryRun      bool           `arg:"-n,--dry-run" help:"Skip writing results without prompt"`
+	Output      MatchOutputArg `arg:"-o,--output" help:"Present changes as 'inline' with color or traditional 'diff'" default:"inline"`
 }
 
 // Description provides detail on what the command does
@@ -72,6 +73,7 @@ func (cmd *ReplaceCommand) GetSearchParams() SearchParameters {
 		IsRegexp:    cmd.args.Regexp,
 		KeySelector: cmd.args.KeySelector,
 		Mode:        cmd.Mode,
+		Output:      cmd.args.Output.Value,
 		Replacement: &cmd.args.Replacement,
 		Search:      cmd.args.Search,
 	}
@@ -130,7 +132,7 @@ func (cmd *ReplaceCommand) findMatches(filePaths []string) (matchesByPath map[st
 			return matchesByPath, err
 		}
 		for _, match := range matches {
-			match.print(os.Stdout, true)
+			match.print(os.Stdout, cmd.args.Output.Value)
 		}
 		if len(matches) > 0 {
 			_, ok := matchesByPath[curPath]

cli/search.go

@@ -24,6 +24,7 @@ type SearchParameters struct {
 	KeySelector string
 	Mode        KeyValueMode
 	IsRegexp    bool
+	Output      MatchOutput
 }
 
 // Match structure to keep indices of matched and replaced terms
@@ -34,14 +35,43 @@ type Match struct {
 	// sorted slices of indices of match starts and length
 	keyIndex   [][]int
 	valueIndex [][]int
-	// in-line diffs of key and value replacements
-	keyLineDiff   string
-	valueLineDiff string
+	// diffs of chosen format for key and value replacements
+	keyDiff   string
+	valueDiff string
 	// final strings after replacement
 	replacedKey   string
 	replacedValue string
 }
 
+// MatchOutput contains the possible ways of presenting a match
+type MatchOutput string
+
+// MatchOutputArg provides a struct to custom validate an arg
+type MatchOutputArg struct {
+	Value MatchOutput
+}
+
+const (
+	// MatchOutputHighlight outputs yellow highlighted matching text
+	MatchOutputHighlight MatchOutput = "highlight"
+	// MatchOutputInline outputs red and green text to show replacements
+	MatchOutputInline MatchOutput = "inline"
+	// MatchOutputDiff outputs addition and subtraction lines to show replacements
+	MatchOutputDiff MatchOutput = "diff"
+)
+
+// UnmarshalText validates the MatchOutputArg
+func (a *MatchOutputArg) UnmarshalText(b []byte) error {
+	arg := string(b[:])
+	switch MatchOutput(arg) {
+	case MatchOutputInline, MatchOutputDiff, MatchOutputHighlight:
+		a.Value = MatchOutput(arg)
+		return nil
+	default:
+		return fmt.Errorf("invalid output format: %s", arg)
+	}
+}
+
 // Searcher provides matching and replacement methods while maintaining references to the command
 // that provides an interface to search operations. Also maintains reference to a compiled regexp.
 type Searcher struct {
@@ -80,8 +110,8 @@ func (s *Searcher) IsMode(mode KeyValueMode) bool {
 // DoSearch searches with either regexp or substring search methods
 func (s *Searcher) DoSearch(path string, k string, v string) (m []*Match) {
 	// Default to original strings
-	replacedKey, keyLineDiff := k, k
-	replacedValue, valueLineDiff := v, v
+	replacedKey, keyDiff := k, k
+	replacedValue, valueDiff := v, v
 	var keyMatchPairs, valueMatchPairs, keySelectorMatches [][]int
 
 	if s.cmd.GetSearchParams().KeySelector != "" {
@@ -91,14 +121,14 @@ func (s *Searcher) DoSearch(path string, k string, v string) (m []*Match) {
 		}
 	}
 	if s.IsMode(ModeKeys) {
-		keyMatchPairs, replacedKey, keyLineDiff = s.matchData(k)
+		keyMatchPairs, replacedKey = s.matchData(k)
 	}
 	if len(keySelectorMatches) > 0 {
-		keyLineDiff = highlightMatches(keyLineDiff, s.keySelectorMatches(keyLineDiff))
+		keyDiff = highlightMatches(keyDiff, s.keySelectorMatches(keyDiff))
 	}
 
 	if s.IsMode(ModeValues) {
-		valueMatchPairs, replacedValue, valueLineDiff = s.matchData(v)
+		valueMatchPairs, replacedValue = s.matchData(v)
 	}
 
 	if len(keyMatchPairs) > 0 || len(valueMatchPairs) > 0 {
@@ -109,8 +139,8 @@ func (s *Searcher) DoSearch(path string, k string, v string) (m []*Match) {
 				value:         v,
 				keyIndex:      keyMatchPairs,
 				valueIndex:    valueMatchPairs,
-				keyLineDiff:   keyLineDiff,
-				valueLineDiff: valueLineDiff,
+				keyDiff:       keyDiff,
+				valueDiff:     valueDiff,
 				replacedKey:   replacedKey,
 				replacedValue: replacedValue,
 			},
@@ -119,10 +149,17 @@ func (s *Searcher) DoSearch(path string, k string, v string) (m []*Match) {
 	return m
 }
 
-func (match *Match) print(out io.Writer, diff bool) {
-	if diff == true {
-		fmt.Fprintf(out, "%s> %s = %s\n", match.path, match.keyLineDiff, match.valueLineDiff)
-	} else {
+func (match *Match) print(out io.Writer, format MatchOutput) {
+	switch format {
+	case MatchOutputInline:
+		coloredKey := colorizeLineDiff(diff.CharacterDiff(match.key, match.replacedKey))
+		coloredValue := colorizeLineDiff(diff.CharacterDiff(match.value, match.replacedValue))
+		fmt.Fprintf(out, "%s> %s = %s\n", match.path, coloredKey, coloredValue)
+	case MatchOutputDiff:
+		before := fmt.Sprintf(" %s> %s = %s\n", match.path, match.key, match.value)
+		after := fmt.Sprintf(" %s> %s = %s\n", match.path, match.replacedKey, match.replacedValue)
+		fmt.Fprint(out, diff.LineDiff(before, after)+"\n")
+	case MatchOutputHighlight:
 		fmt.Fprintf(out, "%s> %s = %s\n", match.path, highlightMatches(match.key, match.keyIndex), highlightMatches(match.value, match.valueIndex))
 	}
 }
@@ -156,8 +193,8 @@ func highlightMatches(s string, matches [][]int) (result string) {
 	return result
 }
 
-// highlightLineDiff will consume (~~del~~)(++add++) markup and colorize in its place
-func (s *Searcher) highlightLineDiff(d string) string {
+// colorizeLineDiff will consume (~~del~~)(++add++) markup and colorize in its place
+func colorizeLineDiff(d string) string {
 	var buf, res []byte
 	removeMode, addMode := false, false
 	removeColor := color.New(color.FgWhite).Add(color.BgRed)
@@ -201,8 +238,8 @@ func (s *Searcher) regexpMatchData(subject string, re *regexp.Regexp) (matchPair
 	return re.FindAllStringIndex(subject, -1)
 }
 
-func (s *Searcher) matchData(subject string) (matchPairs [][]int, replaced string, inlineDiff string) {
-	replaced, inlineDiff = subject, subject
+func (s *Searcher) matchData(subject string) (matchPairs [][]int, replaced string) {
+	replaced = subject
 	matchPairs = make([][]int, 0)
 
 	if s.cmd.GetSearchParams().IsRegexp {
@@ -217,8 +254,7 @@ func (s *Searcher) matchData(subject string) (matchPairs [][]int, replaced strin
 		} else {
 			replaced = strings.ReplaceAll(subject, s.cmd.GetSearchParams().Search, *s.cmd.GetSearchParams().Replacement)
 		}
-		inlineDiff = s.highlightLineDiff(diff.CharacterDiff(subject, replaced))
 	}
 
-	return matchPairs, replaced, inlineDiff
+	return matchPairs, replaced
 }

doc/commands/replace.md

@@ -1,3 +1,7 @@
 # replace
 
 `replace` works similarly to `grep`, but has the ability to mutate data inside Vault. By default, confirmation is required before writing data. You may skip confirmation by using the `-y`/`--confirm` flags. Conversely, you may use the `-n`/`--dry-run` flags to skip both confirmation and any writes. Changes that would be made are presented in red (delete) and green (add) coloring.
+
+This command has two output formats available via the `--output` flag:
+- `inline`: A colorized inline format where deletions are in red background text and additions are in green background text. This is the default.
+- `diff`: A non-colorized format that prints changes in two lines prefixed with a `-` for before and `+` for after replacement. This is more useful for copying and pasting the result.

test/suites/commands/replace.bats

@@ -66,6 +66,19 @@ load ../../bin/plugins/bats-assert/load
   run get_vault_value "value" "${KV_BACKEND}/src/prod/all"
   assert_line all
 
+  #######################################
+  echo "==== case: replace with invalid output format ===="
+  run ${APP_BIN} -c "replace -s 'produce' 'apple' 'orange' ${KV_BACKEND}/src/selector/1 -o invalid"
+  assert_failure
+  assert_line --partial "invalid output format: invalid"
+
+  #######################################
+  echo "==== case: replace with diff output format ===="
+  run ${APP_BIN} -c "replace -s 'produce' 'apple' 'orange' ${KV_BACKEND}/src/selector/1 -n -o diff"
+  assert_success
+  assert_line "- /${KV_BACKEND}/src/selector/1> produce = apple"
+  assert_line "+ /${KV_BACKEND}/src/selector/1> produce = orange"
+
   #######################################
   echo "==== case: replace value in single path with selector ===="
   run ${APP_BIN} -c "replace -s 'produce' 'apple' 'orange' ${KV_BACKEND}/src/selector/1 -y"