Merge branch 'dev' of github.com:reeflective/console into dev

console.go

@@ -12,14 +12,16 @@ import (
 // Console is an integrated console application instance.
 type Console struct {
 	// Application
-	name        string           // Used in the prompt, and for readline `.inputrc` application-specific settings.
-	shell       *readline.Shell  // Provides readline functionality (inputs, completions, hints, history)
-	printLogo   func(c *Console) // Simple logo printer.
-	menus       map[string]*Menu // Different command trees, prompt engines, etc.
-	filters     []string         // Hide commands based on their attributes and current context.
-	isExecuting bool             // Used by log functions, which need to adapt behavior (print the prompt, , etc)
-	printed     bool             // Used to adjust asynchronous messages too.
-	mutex       *sync.RWMutex    // Concurrency management.
+	name          string           // Used in the prompt, and for readline `.inputrc` application-specific settings.
+	shell         *readline.Shell  // Provides readline functionality (inputs, completions, hints, history)
+	printLogo     func(c *Console) // Simple logo printer.
+	cmdHighlight  string           // Ansi code for highlighting of command in default highlighter. Green by default.
+	flagHighlight string           // Ansi code for highlighting of flag in default highlighter. Grey by default.
+	menus         map[string]*Menu // Different command trees, prompt engines, etc.
+	filters       []string         // Hide commands based on their attributes and current context.
+	isExecuting   bool             // Used by log functions, which need to adapt behavior (print the prompt, etc.)
+	printed       bool             // Used to adjust asynchronous messages too.
+	mutex         *sync.RWMutex    // Concurrency management.
 
 	// Execution
 
@@ -33,6 +35,17 @@ type Console struct {
 	// know how to handle it in all situations.
 	NewlineAfter bool
 
+	// Leave empty lines with NewlineBefore and NewlineAfter, even if the provided input was empty.
+	// Empty characters are defined as any number of spaces and tabs. The 'empty' character set
+	// can be changed by modifying Console.EmptyChars
+	// This field is false by default.
+	NewlineWhenEmpty bool
+
+	// Characters that are used to determine whether an input line was empty. If a line is not entirely
+	// made up by any of these characters, then it is not considered empty. The default characters
+	// are ' ' and '\t'.
+	EmptyChars []rune
+
 	// PreReadlineHooks - All the functions in this list will be executed,
 	// in their respective orders, before the console starts reading
 	// any user input (ie, before redrawing the prompt).
@@ -82,13 +95,17 @@ func New(app string) *Console {
 	}
 
 	// Syntax highlighting, multiline callbacks, etc.
+	console.cmdHighlight = seqFgGreen
+	console.flagHighlight = seqBrightWigth
 	console.shell.AcceptMultiline = console.acceptMultiline
 	console.shell.SyntaxHighlighter = console.highlightSyntax
 
 	// Completion
 	console.shell.Completer = console.complete
 	console.defaultStyleConfig()
 
+	// Defaults
+	console.EmptyChars = []rune{' ', '\t'}
 	return console
 }
 

highlighter.go

@@ -31,6 +31,22 @@ var (
 	reverseReset    = "\x1b[27m"
 )
 
+// SetDefaultCommandHighlight allows the user to change the highlight color for a command in the default syntax
+// highlighter using an ansi code.
+// This action has no effect if a custom syntax highlighter for the shell is set.
+// By default, the highlight code is green ("\x1b[32m").
+func (c *Console) SetDefaultCommandHighlight(seq string) {
+	c.cmdHighlight = seq
+}
+
+// SetDefaultFlagHighlight allows the user to change the highlight color for a flag in the default syntax
+// highlighter using an ansi color code.
+// This action has no effect if a custom syntax highlighter for the shell is set.
+// By default, the highlight code is grey ("\x1b[38;05;244m").
+func (c *Console) SetDefaultFlagHighlight(seq string) {
+	c.flagHighlight = seq
+}
+
 // highlightSyntax - Entrypoint to all input syntax highlighting in the Wiregost console.
 func (c *Console) highlightSyntax(input []rune) (line string) {
 	// Split the line as shellwords
@@ -82,7 +98,7 @@ func (c *Console) highlightCommand(done, args []string, _ *cobra.Command) ([]str
 		}
 
 		if cmdFound {
-			highlighted = append(highlighted, bold+seqFgGreen+args[0]+seqFgReset+boldReset)
+			highlighted = append(highlighted, bold+c.cmdHighlight+args[0]+seqFgReset+boldReset)
 			rest = args[1:]
 
 			return append(done, highlighted...), rest
@@ -102,7 +118,7 @@ func (c *Console) highlightCommandFlags(done, args []string, _ *cobra.Command) (
 
 	for _, arg := range args {
 		if strings.HasPrefix(arg, "-") || strings.HasPrefix(arg, "--") {
-			highlighted = append(highlighted, bold+seqBrightWigth+arg+seqFgReset+boldReset)
+			highlighted = append(highlighted, bold+c.flagHighlight+arg+seqFgReset+boldReset)
 		} else {
 			highlighted = append(highlighted, arg)
 		}

line.go

@@ -267,3 +267,14 @@ func trimSpacesMatch(remain []string) (trimmed []string) {
 
 	return
 }
+
+func (c *Console) lineEmpty(line string) bool {
+	empty := true
+	for _, r := range line {
+		if !strings.ContainsRune(string(c.EmptyChars), r) {
+			empty = false
+			break
+		}
+	}
+	return empty
+}

run.go

@@ -29,11 +29,24 @@ func (c *Console) StartContext(ctx context.Context) error {
 		c.printLogo(c)
 	}
 
-	for {
+	lastLine := "" // used to check if last read line is empty.
+
+	for i := 0; ; i++ {
 		// Identical to printing it at the end of the loop, and
 		// leaves some space between the logo and the first prompt.
+
+		// If NewlineAfter is set but NewlineWhenEmpty is not set, we do a check to see
+		// if the last line was empty. If it wasn't, then we can print.
+		//fmt.Println(lastLine, len(lastLine))
 		if c.NewlineAfter {
-			fmt.Println()
+			if !c.NewlineWhenEmpty && i != 0 {
+				// Print on the condition that the last input wasn't empty.
+				if !c.lineEmpty(lastLine) {
+					fmt.Println()
+				}
+			} else {
+				fmt.Println()
+			}
 		}
 
 		// Always ensure we work with the active menu, with freshly
@@ -51,13 +64,19 @@ func (c *Console) StartContext(ctx context.Context) error {
 
 		// Block and read user input.
 		line, err := c.shell.Readline()
-
 		if c.NewlineBefore {
-			fmt.Println()
+			if !c.NewlineWhenEmpty {
+				if !c.lineEmpty(line) {
+					fmt.Println()
+				}
+			} else {
+				fmt.Println()
+			}
 		}
 
 		if err != nil {
 			menu.handleInterrupt(err)
+			lastLine = line
 			continue
 		}
 
@@ -74,6 +93,7 @@ func (c *Console) StartContext(ctx context.Context) error {
 		}
 
 		if len(args) == 0 {
+			lastLine = line
 			continue
 		}
 
@@ -93,6 +113,7 @@ func (c *Console) StartContext(ctx context.Context) error {
 		if err := c.execute(ctx, menu, args, false); err != nil {
 			menu.ErrorHandler(ExecutionError{newError(err, "")})
 		}
+		lastLine = line
 	}
 }