Show top menu buttons at the correct X position

config/config.yml

@@ -6,5 +6,5 @@ selected_style_fallback: "default-fallback" # Style for 8-color capable terminal
 show_top_menu: true
 show_line_index: true
 extend_line_index: false # Extend line index to the bottom of the screen
-buffer_info_message: "File: %f Cursor: (%x, %y, %p) Chars: %c"
+buffer_info_message: "File: %f, Filetype: %t, Cursor: (%x, %y, %p), Chars: %c"
 tab_indentation: 4 # Length of tab characters

config/styles/classic.yml

@@ -19,3 +19,15 @@ colors:
   message_bar_fg: "black" # Message bar text color
   input_bar_bg: "245" # Input bar background color
   input_bar_fg: "black" # Input bar text color
+
+  # Syntax highlighting
+  syntax_comment: "darkgray"
+  syntax_keyword: "lightgreen"
+  syntax_identifier: "yellow"
+  syntax_constant: "purple"
+  syntax_variable: "yellow"
+  syntax_string: "purple"
+  # Typer logs highlighting
+  syntax_info: "lightgreen"
+  syntax_warning: "gold"
+  syntax_error: "red"

config/styles/default-fallback.yml

@@ -19,3 +19,7 @@ colors:
   message_bar_fg: "black" # Message bar text color
   input_bar_bg: "white" # Input bar background color
   input_bar_fg: "black" # Input bar text color
+  # Typer logs highlighting
+  syntax_info: "green"
+  syntax_warning: "yellow"
+  syntax_error: "red"

config/styles/default.yml

@@ -5,6 +5,7 @@ style_type: "256-color"
 
 # Colors
 colors:
+  # Main colors
   buffer_area_bg: "234" # Buffer area background color
   buffer_area_fg: "white" # Buffer area text color
   buffer_area_sel: "243" # Buffer area selected text and cursor background color
@@ -18,4 +19,16 @@ colors:
   message_bar_bg: "236" # Message bar background color
   message_bar_fg: "white" # Message bar text color
   input_bar_bg: "236" # Input bar background color
-  input_bar_fg: "white" # Input bar text color
+  input_bar_fg: "white" # Input bar text color
+
+  # Syntax highlighting
+  syntax_comment: "gray"
+  syntax_keyword: "gold"
+  syntax_identifier: "purple"
+  syntax_constant: "teal"
+  syntax_variable: "purple"
+  syntax_string: "blue"
+  # Typer logs highlighting
+  syntax_info: "green"
+  syntax_warning: "yellow"
+  syntax_error: "red"

config/syntax/typer_logs.yml

@@ -0,0 +1,12 @@
+filetype: typer_logs
+
+rules:
+  - type: info
+    regex: '^\[INFO\].*$'
+    multiline: true
+  - type: warning
+    regex: '^\[WARNING\].*$'
+    multiline: true
+  - type: error
+    regex: '^\[ERROR\].*$'
+    multiline: true

config/syntax/yaml.yml

@@ -0,0 +1,15 @@
+filetype: yaml
+filenames: ".y[a]?ml$"
+
+rules:
+  - type: string # Strings
+    regex: '(["''])(.*?)(["''])'
+  - type: comment
+    regex: "#.*"
+  - type: identifier # Keys
+    regex: '^[[:blank:]]*(-.)?([a-z0-9\._\-])+:'
+    multiline: true
+  - type: constant # Number values
+    regex: '\d+(\.\d+)?'
+  - type: constant # True/false values
+    regex: '\b(YES|yes|Y|y|ON|on|TRUE|True|true|NO|no|N|n|OFF|off|FALSE|False|false)\b'

src/buffer.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"regexp"
 	"slices"
 	"strings"
 	"typer/runestring"
@@ -21,6 +22,8 @@ type Buffer struct {
 	Selection *Selection
 
 	canSave  bool
+	canEdit  bool
+	filetype string
 	filename string
 }
 
@@ -55,14 +58,51 @@ func drawBuffer(window *Window) {
 
 	bufferX, bufferY, _, _ := window.GetTextAreaDimensions()
 
+	parsedSyntaxes, err := HighlightString(string(buffer.GetContentsAsString()), buffer.filetype)
+	if err != nil {
+		window.PrintMessage(fmt.Sprintf("Could not parse regular expression in '%s' syntax: %s", buffer.filetype, err), TYPER_MESSAGE_ERROR)
+	}
+
+	i := -1
 	for lineIndex, line := range buffer.Contents {
 		for runeIndex, r := range append(line, ' ') {
+			i++
 			drawPosition := Position{runeIndex, lineIndex}
 
 			if x-buffer.Offset.X >= bufferX && y-buffer.Offset.Y >= bufferY {
 				// Default style
 				style := tcell.StyleDefault.Background(CurrentStyle.BufferAreaBg).Foreground(CurrentStyle.BufferAreaFg)
 
+				// Check for syntax highlighting
+				for _, parsedSyntax := range parsedSyntaxes {
+					if i >= parsedSyntax.StartIndex && i < parsedSyntax.EndIndex {
+						switch parsedSyntax.Type {
+						case "comment":
+							style = style.Foreground(CurrentStyle.SyntaxComment)
+						case "keyword":
+							style = style.Foreground(CurrentStyle.SyntaxKeyword)
+						case "identifier":
+							style = style.Foreground(CurrentStyle.SyntaxIdentifier)
+						case "constant":
+							style = style.Foreground(CurrentStyle.SyntaxConstant)
+						case "variable":
+							style = style.Foreground(CurrentStyle.SyntaxVariable)
+						case "string":
+							style = style.Foreground(CurrentStyle.SyntaxString)
+
+						// Special types for typer logs
+						case "info":
+							style = style.Foreground(CurrentStyle.SyntaxInfo)
+						case "warning":
+							style = style.Foreground(CurrentStyle.SyntaxWarning)
+						case "error":
+							style = style.Foreground(CurrentStyle.SyntaxError)
+						}
+
+						break
+					}
+				}
+
 				// Change background if under cursor
 				if buffer.CursorPos.Equals(runeIndex, lineIndex) {
 					style = style.Background(CurrentStyle.BufferAreaSel)
@@ -135,6 +175,17 @@ func (buffer *Buffer) Load() error {
 		buffer.CursorPos.X = len(buffer.Contents[buffer.CursorPos.Y])
 	}
 
+	// Set buffer filetype
+	for _, syntax := range AvailableSyntaxes {
+		if syntax.Filenames == "" {
+			continue
+		}
+
+		if ok, _ := regexp.MatchString(syntax.Filenames, buffer.filename); ok {
+			buffer.filetype = syntax.Filetype
+		}
+	}
+
 	return nil
 }
 
@@ -603,6 +654,7 @@ func CreateFileBuffer(filename string, openNonExistentFile bool) (*Buffer, error
 		Contents:  make([]runestring.RuneString, 1),
 		CursorPos: Position{0, 0},
 		canSave:   true,
+		canEdit:   true,
 		filename:  abs,
 	}
 
@@ -626,6 +678,7 @@ func CreateBuffer(bufferName string) (*Buffer, error) {
 		Contents:  make([]runestring.RuneString, 1),
 		CursorPos: Position{0, 0},
 		canSave:   true,
+		canEdit:   true,
 		filename:  "",
 	}
 

src/command.go

@@ -29,7 +29,7 @@ func initCommands() {
 				selectionEnd:   Position{len(window.CurrentBuffer.Contents) - 1, len(lastLine) - 1},
 			}
 
-			window.PrintMessage("Selected all text.")
+			window.PrintMessage("Selected all text", TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -44,9 +44,9 @@ func initCommands() {
 
 			// Send appropriate message and remove text depending on copying method
 			if copyingMethod == 0 {
-				window.PrintMessage("Copied line to clipboard.")
+				window.PrintMessage("Copied line to clipboard", TYPER_MESSAGE_INFO)
 			} else {
-				window.PrintMessage("Copied selection to clipboard.")
+				window.PrintMessage("Copied selection to clipboard", TYPER_MESSAGE_INFO)
 			}
 		},
 	}
@@ -62,9 +62,9 @@ func initCommands() {
 
 			// Send appropriate message depending on copying method
 			if copyingMethod == 0 {
-				window.PrintMessage("Copied line to clipboard.")
+				window.PrintMessage("Copied line to clipboard", TYPER_MESSAGE_INFO)
 			} else {
-				window.PrintMessage("Copied selection to clipboard. ")
+				window.PrintMessage("Copied selection to clipboard", TYPER_MESSAGE_INFO)
 			}
 		},
 	}
@@ -72,9 +72,14 @@ func initCommands() {
 	pasteCmd := Command{
 		cmd: "paste",
 		run: func(window *Window, args ...string) {
+			if !window.CurrentBuffer.canEdit {
+				window.PrintMessage(fmt.Sprintf("Buffer '%s' is read-only", window.CurrentBuffer.Name), TYPER_MESSAGE_WARNING)
+				return
+			}
+
 			if len(window.Clipboard) != 0 {
 				window.CurrentBuffer.PasteText(window, window.Clipboard)
-				window.PrintMessage("Pasted text to buffer. ")
+				window.PrintMessage("Pasted text to buffer", TYPER_MESSAGE_INFO)
 			}
 		},
 	}
@@ -83,7 +88,7 @@ func initCommands() {
 		cmd: "save",
 		run: func(window *Window, args ...string) {
 			if !window.CurrentBuffer.canSave {
-				window.PrintMessage("Cannot save buffer!")
+				window.PrintMessage("Cannot save buffer", TYPER_MESSAGE_ERROR)
 				return
 			}
 
@@ -100,7 +105,7 @@ func initCommands() {
 				input = <-inputChannel
 
 				if strings.TrimSpace(input) == "" {
-					window.PrintMessage("No save location was given!")
+					window.PrintMessage("No save location was given", TYPER_MESSAGE_ERROR)
 					return
 				}
 
@@ -108,12 +113,12 @@ func initCommands() {
 				err := window.CurrentBuffer.Save()
 				if err != nil {
 
-					window.PrintMessage(fmt.Sprintf("Could not save file: %s", err))
+					window.PrintMessage(fmt.Sprintf("Could not save file: %s", err), TYPER_MESSAGE_ERROR)
 					window.CurrentBuffer.filename = ""
 					return
 				}
 
-				window.PrintMessage("File saved.")
+				window.PrintMessage("File saved", TYPER_MESSAGE_INFO)
 			}()
 		},
 		autocomplete: func(window *Window, args ...string) []string {
@@ -133,16 +138,16 @@ func initCommands() {
 				}
 
 				if openBuffer := GetOpenFileBuffer(input); openBuffer != nil {
-					window.PrintMessage(fmt.Sprintf("File already open! Switching to buffer: %s", openBuffer.Name))
+					window.PrintMessage(fmt.Sprintf("File already open! Switching to buffer: %s", openBuffer.Name), TYPER_MESSAGE_INFO)
 					window.CurrentBuffer = openBuffer
 				} else {
 					newBuffer, err := CreateFileBuffer(input, false)
 					if err != nil {
-						window.PrintMessage(fmt.Sprintf("Could not open file: %s", err.Error()))
+						window.PrintMessage(fmt.Sprintf("Could not open file: %s", err.Error()), TYPER_MESSAGE_WARNING)
 						return
 					}
 
-					window.PrintMessage(fmt.Sprintf("Opening file at: %s", newBuffer.filename))
+					window.PrintMessage(fmt.Sprintf("Opening file at: %s", newBuffer.filename), TYPER_MESSAGE_INFO)
 					window.CurrentBuffer = newBuffer
 				}
 			}()
@@ -157,7 +162,7 @@ func initCommands() {
 				log.Fatalf("Could not reload buffer: %s", err)
 			}
 
-			window.PrintMessage("Buffer reloaded.")
+			window.PrintMessage("Buffer reloaded", TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -174,9 +179,9 @@ func initCommands() {
 				pos := window.CurrentBuffer.FindSubstring(input, window.CurrentBuffer.CursorPos)
 				if pos.X >= 0 && pos.Y >= 0 {
 					window.CurrentBuffer.CursorPos = pos
-					window.PrintMessage("Match found.")
+					window.PrintMessage("Match found", TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(input)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(input)), TYPER_MESSAGE_WARNING)
 				}
 
 				return
@@ -193,9 +198,9 @@ func initCommands() {
 				pos := window.CurrentBuffer.FindSubstring(input, window.CurrentBuffer.CursorPos)
 				if pos.X >= 0 && pos.Y >= 0 {
 					window.CurrentBuffer.CursorPos = pos
-					window.PrintMessage("Match found.")
+					window.PrintMessage("Match found", TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(input)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(input)), TYPER_MESSAGE_WARNING)
 				}
 			}()
 		},
@@ -215,9 +220,9 @@ func initCommands() {
 				pos := window.CurrentBuffer.FindAndReplaceSubstring(findStr, replaceStr, window.CurrentBuffer.CursorPos)
 				if pos.X >= 0 && pos.Y >= 0 {
 					window.CurrentBuffer.CursorPos = pos
-					window.PrintMessage("Match replaced successfully.")
+					window.PrintMessage("Match replaced successfully", TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(findStr)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(findStr)), TYPER_MESSAGE_WARNING)
 				}
 
 				return
@@ -236,9 +241,9 @@ func initCommands() {
 				pos := window.CurrentBuffer.FindAndReplaceSubstring(findStr, replaceStr, window.CurrentBuffer.CursorPos)
 				if pos.X >= 0 && pos.Y >= 0 {
 					window.CurrentBuffer.CursorPos = pos
-					window.PrintMessage("Match replaced successfully.")
+					window.PrintMessage("Match replaced successfully", TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(findStr)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(findStr)), TYPER_MESSAGE_WARNING)
 				}
 			}()
 		},
@@ -257,9 +262,9 @@ func initCommands() {
 
 				replacements := window.CurrentBuffer.FindAndReplaceAll(findStr, replaceStr)
 				if replacements > 0 {
-					window.PrintMessage(fmt.Sprintf("Replaced all %d matches successfully.", replacements))
+					window.PrintMessage(fmt.Sprintf("Replaced all %d matches successfully", replacements), TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(findStr)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(findStr)), TYPER_MESSAGE_WARNING)
 				}
 
 				return
@@ -277,9 +282,9 @@ func initCommands() {
 
 				replacements := window.CurrentBuffer.FindAndReplaceAll(findStr, replaceStr)
 				if replacements > 0 {
-					window.PrintMessage(fmt.Sprintf("Replaced all %d matches successfully.", replacements))
+					window.PrintMessage(fmt.Sprintf("Replaced all %d matches successfully", replacements), TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer!", string(findStr)))
+					window.PrintMessage(fmt.Sprintf("'%s' not found in buffer", string(findStr)), TYPER_MESSAGE_WARNING)
 				}
 			}()
 		},
@@ -300,7 +305,7 @@ func initCommands() {
 			}
 
 			window.CurrentBuffer = Buffers[index]
-			window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'.", window.CurrentBuffer.Name))
+			window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'", window.CurrentBuffer.Name), TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -319,7 +324,7 @@ func initCommands() {
 			}
 
 			window.CurrentBuffer = Buffers[index]
-			window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'.", window.CurrentBuffer.Name))
+			window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'", window.CurrentBuffer.Name), TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -335,7 +340,7 @@ func initCommands() {
 			}
 
 			window.CursorMode = CursorModeBuffer
-			window.PrintMessage(fmt.Sprintf("New buffer created with the name '%s'.", window.CurrentBuffer.Name))
+			window.PrintMessage(fmt.Sprintf("New buffer created with the name '%s'", window.CurrentBuffer.Name), TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -354,7 +359,7 @@ func initCommands() {
 				window.CurrentBuffer = Buffers[bufferIndex]
 			}
 			window.CursorMode = CursorModeBuffer
-			window.PrintMessage("Buffer closed.")
+			window.PrintMessage("Buffer closed", TYPER_MESSAGE_INFO)
 		},
 	}
 
@@ -383,14 +388,14 @@ func initCommands() {
 				}
 
 				if _, ok := AvailableStyles[input]; !ok {
-					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input), TYPER_MESSAGE_ERROR)
 					return
 				}
 
 				if ok := SetCurrentStyle(window.screen, input); ok {
-					window.PrintMessage(fmt.Sprintf("Setting style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Setting style to '%s'", input), TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input), TYPER_MESSAGE_ERROR)
 				}
 
 				return
@@ -405,25 +410,70 @@ func initCommands() {
 				}
 
 				if _, ok := AvailableStyles[input]; !ok {
-					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input), TYPER_MESSAGE_ERROR)
 					return
 				}
 
 				if ok := SetCurrentStyle(window.screen, input); ok {
-					window.PrintMessage(fmt.Sprintf("Setting style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Setting style to '%s'", input), TYPER_MESSAGE_INFO)
 				} else {
-					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input))
+					window.PrintMessage(fmt.Sprintf("Could not set style to '%s'", input), TYPER_MESSAGE_ERROR)
 				}
 			}()
 		},
 	}
 
+	setFiletypeCmd := Command{
+		cmd: "set-filetype",
+		run: func(window *Window, args ...string) {
+			if len(args) >= 1 {
+				input := args[0]
+
+				if input == "" {
+					return
+				}
+
+				if strings.ToLower(input) == "none" {
+					window.CurrentBuffer.filetype = ""
+					window.PrintMessage("Setting filetype to 'none'", TYPER_MESSAGE_INFO)
+					return
+				} else if _, ok := AvailableSyntaxes[input]; !ok {
+					window.PrintMessage(fmt.Sprintf("Could not set filetype to '%s'", input), TYPER_MESSAGE_ERROR)
+					return
+				}
+
+				window.CurrentBuffer.filetype = input
+				window.PrintMessage(fmt.Sprintf("Setting filetype to '%s'", input), TYPER_MESSAGE_INFO)
+
+				return
+			}
+
+			inputChannel := RequestInput(window, "Filetype to switch to:", "")
+			go func() {
+				input := <-inputChannel
+
+				if input == "" {
+					return
+				}
+
+				if _, ok := AvailableSyntaxes[input]; !ok {
+					window.PrintMessage(fmt.Sprintf("Could not set filetype to '%s'", input), TYPER_MESSAGE_ERROR)
+					return
+				}
+
+				window.CurrentBuffer.filetype = input
+				window.PrintMessage(fmt.Sprintf("Setting filetype to '%s'", input), TYPER_MESSAGE_INFO)
+
+			}()
+		},
+	}
+
 	menuFileCmd := Command{
 		cmd: "menu-file",
 		run: func(window *Window, args ...string) {
 			for _, button := range TopMenuButtons {
 				if button.Name == "File" {
-					button.Action(window)
+					button.Action(window, &button)
 					break
 				}
 			}
@@ -435,7 +485,7 @@ func initCommands() {
 		run: func(window *Window, args ...string) {
 			for _, button := range TopMenuButtons {
 				if button.Name == "Edit" {
-					button.Action(window)
+					button.Action(window, &button)
 					break
 				}
 			}
@@ -447,7 +497,7 @@ func initCommands() {
 		run: func(window *Window, args ...string) {
 			for _, button := range TopMenuButtons {
 				if button.Name == "Buffers" {
-					button.Action(window)
+					button.Action(window, &button)
 					break
 				}
 			}
@@ -521,6 +571,7 @@ func initCommands() {
 	commands["toggle-top-bar"] = &toggleTopBar
 	commands["toggle-line-index"] = &toggleLineIndex
 	commands["set-style"] = &setStyleCmd
+	commands["set-filetype"] = &setFiletypeCmd
 	commands["menu-file"] = &menuFileCmd
 	commands["menu-edit"] = &menuEditCmd
 	commands["menu-buffers"] = &menuBuffersCmd
@@ -533,7 +584,7 @@ func RunCommand(window *Window, cmd string, args ...string) bool {
 		command.run(window, args...)
 		return true
 	} else {
-		window.PrintMessage(fmt.Sprintf("Could not find command '%s'!", cmd))
+		window.PrintMessage(fmt.Sprintf("Could not find command '%s'", cmd), TYPER_MESSAGE_ERROR)
 		return false
 	}
 }

src/highlighting.go

@@ -0,0 +1,109 @@
+package main
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+
+	"gopkg.in/yaml.v3"
+)
+
+type SyntaxRule struct {
+	Type      string `yaml:"type"`
+	Regex     string `yaml:"regex"`
+	Multiline bool   `yaml:"multiline"`
+}
+
+type Syntax struct {
+	Filetype  string       `yaml:"filetype"`
+	Filenames string       `yaml:"filenames"`
+	Rules     []SyntaxRule `yaml:"rules"`
+}
+
+type ParsedSyntax struct {
+	StartIndex int
+	EndIndex   int
+	Type       string
+}
+
+var AvailableSyntaxes map[string]Syntax = make(map[string]Syntax)
+
+func ReadSyntaxHighlighters() {
+	// Get syntax directory path
+	syntaxDirPath := GetConfigPath("syntax")
+
+	// Ensure directory exists at path
+	if stat, err := os.Stat(syntaxDirPath); syntaxDirPath == "" || err != nil || !stat.IsDir() {
+		return
+	}
+
+	// Get directory entries
+	entries, err := os.ReadDir(syntaxDirPath)
+	if err != nil {
+		log.Fatalf("Could not read syntax directory: %s", err)
+	}
+
+	// Read entries in directory
+	for _, entry := range entries {
+		entryPath := filepath.Join(syntaxDirPath, entry.Name())
+
+		data, err := os.ReadFile(entryPath)
+		if err != nil {
+			log.Fatalf("Could not read syntax file (%s): %s", entryPath, err)
+		}
+
+		syntax := Syntax{}
+		err = yaml.Unmarshal(data, &syntax)
+		if err != nil {
+			log.Fatalf("Could not read syntax file (%s): %s", entryPath, err)
+		}
+
+		if _, ok := AvailableSyntaxes[syntax.Filetype]; !ok {
+			AvailableSyntaxes[syntax.Filetype] = syntax
+		}
+	}
+}
+
+func HighlightString(s string, filetype string) (parsedSyntaxes []ParsedSyntax, err error) {
+	// Get syntax for filetype
+	syntax, ok := AvailableSyntaxes[filetype]
+	if !ok {
+		return nil, nil
+	}
+
+	for _, rule := range syntax.Rules {
+
+		regex := rule.Regex
+		if rule.Multiline {
+			regex = "(?m)" + rule.Regex
+		}
+		r, err := regexp.Compile(regex)
+		if err != nil {
+			return nil, err
+		}
+
+		matches := r.FindAllStringIndex(s, -1)
+		for _, match := range matches {
+			skip := false
+			for _, parsedSyntax := range parsedSyntaxes {
+				if (match[0] >= parsedSyntax.StartIndex && match[0] < parsedSyntax.EndIndex) || (match[1] >= parsedSyntax.StartIndex && match[1] < parsedSyntax.EndIndex) {
+					skip = true
+				}
+			}
+			if skip {
+				continue
+			}
+
+			parsedSyntax := ParsedSyntax{
+				StartIndex: match[0],
+				EndIndex:   match[1],
+				Type:       rule.Type,
+			}
+
+			parsedSyntaxes = append(parsedSyntaxes, parsedSyntax)
+		}
+	}
+
+	return parsedSyntaxes, nil
+}

src/main.go

@@ -23,6 +23,9 @@ func main() {
 	// Read styles directory
 	readStyles()
 
+	// Read syntax directory
+	ReadSyntaxHighlighters()
+
 	// Initialize commands
 	initCommands()
 
@@ -35,7 +38,7 @@ func main() {
 		for i, file := range flag.Args() {
 			b, err := CreateFileBuffer(file, true)
 			if err != nil {
-				window.PrintMessage("Could not open file: " + file)
+				window.PrintMessage("Could not open file: "+file, TYPER_MESSAGE_ERROR)
 				continue
 			}
 
@@ -46,6 +49,14 @@ func main() {
 		}
 	}
 
+	// Create logs buffer
+	logsBuffer, err := CreateBuffer("Logs")
+	if err != nil {
+		log.Fatalf("Could not create logs buffer")
+	}
+	logsBuffer.filetype = "typer_logs"
+	logsBuffer.canEdit = false
+
 	for !window.closed {
 		window.Draw()
 		window.ProcessEvents()

src/message_bar.go

@@ -1,20 +1,60 @@
 package main
 
 import (
+	"slices"
 	"time"
+	"typer/runestring"
 
 	"github.com/gdamore/tcell/v2"
 )
 
+type TyperMessageUrgency uint
+
+const (
+	TYPER_MESSAGE_INFO TyperMessageUrgency = iota
+	TYPER_MESSAGE_WARNING
+	TYPER_MESSAGE_ERROR
+)
+
 type TyperMessage struct {
-	timestamp int64
-	message   string
+	Timestamp int64
+	Urgency   TyperMessageUrgency
+	Message   string
 }
 
-var messageLog = make([]TyperMessage, 0)
+var lastMessage *TyperMessage
 
-func (window *Window) PrintMessage(message string) {
-	messageLog = append(messageLog, TyperMessage{timestamp: time.Now().UnixMilli(), message: message})
+func (window *Window) PrintMessage(message string, urgency TyperMessageUrgency) {
+	lastMessage = &TyperMessage{Timestamp: time.Now().UnixMilli(), Message: message, Urgency: urgency}
+
+	logsBuffer := GetBufferByName("Logs")
+	if logsBuffer != nil {
+		messageToPrint := ""
+		switch lastMessage.Urgency {
+		case TYPER_MESSAGE_INFO:
+			messageToPrint = "[INFO] "
+		case TYPER_MESSAGE_WARNING:
+			messageToPrint = "[WARNING] "
+		case TYPER_MESSAGE_ERROR:
+			messageToPrint = "[ERROR] "
+		default:
+			messageToPrint = "[???] "
+		}
+
+		messageToPrint += "[" + time.UnixMilli(lastMessage.Timestamp).Format("15:04:05") + "] "
+		messageToPrint += lastMessage.Message + "\n"
+
+		if len(logsBuffer.Contents) >= 1000 {
+			logsBuffer.Contents = slices.Delete(logsBuffer.Contents, 0, len(logsBuffer.Contents)-999)
+		}
+
+		logsBuffer.CursorPos = Position{
+			X: len(logsBuffer.Contents[len(logsBuffer.Contents)-1]),
+			Y: len(logsBuffer.Contents) - 1,
+		}
+
+		logsBuffer.WriteString(runestring.RuneString(messageToPrint))
+	}
 
 	err := window.screen.PostEvent(tcell.NewEventInterrupt(nil))
 	if err != nil {
@@ -39,8 +79,18 @@ func drawMessageBar(window *Window) {
 	sizeX, sizeY := screen.Size()
 
 	messageToPrint := ""
-	if len(messageLog) > 0 && time.Since(time.UnixMilli(messageLog[len(messageLog)-1].timestamp)).Seconds() < 5 {
-		messageToPrint = messageLog[len(messageLog)-1].message
+	if lastMessage != nil && time.Since(time.UnixMilli(lastMessage.Timestamp)).Seconds() < 5 {
+		switch lastMessage.Urgency {
+		case TYPER_MESSAGE_INFO:
+			messageToPrint = "[INFO] "
+		case TYPER_MESSAGE_WARNING:
+			messageToPrint = "[WARNING] "
+		case TYPER_MESSAGE_ERROR:
+			messageToPrint = "[ERROR] "
+		default:
+			messageToPrint = "[???] "
+		}
+		messageToPrint += lastMessage.Message
 	}
 
 	for x := 0; x < sizeX; x++ {

src/style.go

@@ -20,7 +20,7 @@ type TyperStyle struct {
 	Description string
 	StyleType   string
 
-	// Colors
+	// Main Colors
 	BufferAreaBg  tcell.Color `name:"buffer_area_bg"`
 	BufferAreaFg  tcell.Color `name:"buffer_area_fg"`
 	BufferAreaSel tcell.Color `name:"buffer_area_sel"`
@@ -35,6 +35,18 @@ type TyperStyle struct {
 	MessageBarFg  tcell.Color `name:"message_bar_fg"`
 	InputBarBg    tcell.Color `name:"input_bar_bg"`
 	InputBarFg    tcell.Color `name:"input_bar_fg"`
+
+	// Syntax highlighting
+	SyntaxComment    tcell.Color `name:"syntax_comment"`
+	SyntaxKeyword    tcell.Color `name:"syntax_keyword"`
+	SyntaxIdentifier tcell.Color `name:"syntax_identifier"`
+	SyntaxConstant   tcell.Color `name:"syntax_constant"`
+	SyntaxVariable   tcell.Color `name:"syntax_variable"`
+	SyntaxString     tcell.Color `name:"syntax_string"`
+	// Typer logs highlighting
+	SyntaxInfo    tcell.Color `name:"syntax_info"`
+	SyntaxWarning tcell.Color `name:"syntax_warning"`
+	SyntaxError   tcell.Color `name:"syntax_error"`
 }
 
 type typerStyleYaml struct {

src/top_menu.go

@@ -11,7 +11,8 @@ import (
 
 type TopMenuButton struct {
 	Name   string
-	Action func(w *Window)
+	PosX   int
+	Action func(w *Window, b *TopMenuButton)
 }
 
 var TopMenuButtons = make([]TopMenuButton, 0)
@@ -20,7 +21,7 @@ func initTopMenu() {
 	// Buttons
 	fileButton := TopMenuButton{
 		Name: "File",
-		Action: func(window *Window) {
+		Action: func(window *Window, button *TopMenuButton) {
 			ClearDropdowns()
 
 			y := 0
@@ -28,7 +29,7 @@ func initTopMenu() {
 				y++
 			}
 
-			d := CreateDropdownMenu([]string{"New", "Save", "Open", "Close", "Quit"}, 0, y, 0, func(i int) {
+			d := CreateDropdownMenu([]string{"New", "Save", "Open", "Close", "Quit"}, button.PosX, y, 0, func(i int) {
 				switch i {
 				case 0:
 					RunCommand(window, "new-buffer")
@@ -49,7 +50,7 @@ func initTopMenu() {
 	}
 	EditButton := TopMenuButton{
 		Name: "Edit",
-		Action: func(window *Window) {
+		Action: func(window *Window, button *TopMenuButton) {
 			ClearDropdowns()
 
 			y := 0
@@ -57,7 +58,7 @@ func initTopMenu() {
 				y++
 			}
 
-			d := CreateDropdownMenu([]string{"Cut", "Copy", "Paste"}, 0, y, 0, func(i int) {
+			d := CreateDropdownMenu([]string{"Cut", "Copy", "Paste"}, button.PosX, y, 0, func(i int) {
 				switch i {
 				case 0:
 					RunCommand(window, "cut")
@@ -75,7 +76,7 @@ func initTopMenu() {
 	}
 	Buffers := TopMenuButton{
 		Name: "Buffers",
-		Action: func(window *Window) {
+		Action: func(window *Window, button *TopMenuButton) {
 			ClearDropdowns()
 
 			y := 0
@@ -92,9 +93,9 @@ func initTopMenu() {
 				}
 			}
 
-			d := CreateDropdownMenu(buffersSlice, 0, y, 0, func(i int) {
+			d := CreateDropdownMenu(buffersSlice, button.PosX, y, 0, func(i int) {
 				window.CurrentBuffer = Buffers[i]
-				window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'.", window.CurrentBuffer.Name))
+				window.PrintMessage(fmt.Sprintf("Set current buffer to '%s'", window.CurrentBuffer.Name), TYPER_MESSAGE_INFO)
 				ClearDropdowns()
 				window.CursorMode = CursorModeBuffer
 			})
@@ -119,8 +120,9 @@ func drawTopMenu(window *Window) {
 	}
 
 	currentX := 1
-	for _, button := range TopMenuButtons {
+	for i, button := range TopMenuButtons {
 		drawText(screen, currentX, 0, currentX+len(button.Name), 0, topMenuStyle, button.Name)
+		TopMenuButtons[i].PosX = currentX
 		currentX += len(button.Name) + 1
 	}
 
@@ -134,6 +136,7 @@ func drawTopMenu(window *Window) {
 func getBufferInfoMsg(window *Window) string {
 	pathToFile := "Not set"
 	filename := "Not set"
+	filetype := "Not set"
 	if window.CurrentBuffer.filename != "" {
 		pathToFile = window.CurrentBuffer.filename
 	}
@@ -141,6 +144,10 @@ func getBufferInfoMsg(window *Window) string {
 		filename = filepath.Base(window.CurrentBuffer.filename)
 	}
 
+	if window.CurrentBuffer.filetype != "" {
+		filetype = window.CurrentBuffer.filetype
+	}
+
 	contents := window.CurrentBuffer.GetContentsAsString()
 	chars := len(contents)
 	words := len(strings.Fields(string(contents)))
@@ -150,6 +157,7 @@ func getBufferInfoMsg(window *Window) string {
 	ret = strings.ReplaceAll(ret, "\n", " ")
 	ret = strings.ReplaceAll(ret, "%F", pathToFile)
 	ret = strings.ReplaceAll(ret, "%f", filename)
+	ret = strings.ReplaceAll(ret, "%t", filetype)
 	ret = strings.ReplaceAll(ret, "%x", strconv.Itoa(window.CurrentBuffer.CursorPos.X+1))
 	ret = strings.ReplaceAll(ret, "%y", strconv.Itoa(window.CurrentBuffer.CursorPos.Y+1))
 	ret = strings.ReplaceAll(ret, "%p", strconv.Itoa(window.CurrentBuffer.PositionToAbsolutePosition(window.CurrentBuffer.CursorPos)+1))

src/window.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"slices"
 	"strconv"
@@ -86,7 +87,7 @@ func CreateWindow() (*Window, error) {
 		if ok := SetCurrentStyle(screen, Config.FallbackStyle); !ok {
 			// Use hard-coded fallback style
 			screen.SetStyle(tcell.StyleDefault.Foreground(CurrentStyle.BufferAreaFg).Background(CurrentStyle.BufferAreaBg))
-			window.PrintMessage("Could not set style either to selected one nor to fallback one!")
+			window.PrintMessage("Could not set style either to selected one nor to fallback one", TYPER_MESSAGE_ERROR)
 		}
 	}
 
@@ -396,6 +397,11 @@ func (window *Window) handleKeyInput(ev *tcell.EventKey) {
 	// Typing
 	if ev.Key() == tcell.KeyBackspace || ev.Key() == tcell.KeyBackspace2 {
 		if window.CursorMode == CursorModeBuffer {
+			if !window.CurrentBuffer.canEdit {
+				window.PrintMessage(fmt.Sprintf("Buffer '%s' is read-only", window.CurrentBuffer.Name), TYPER_MESSAGE_WARNING)
+				return
+			}
+
 			if window.CurrentBuffer.Selection != nil {
 				window.CurrentBuffer.CutText(window)
 			} else {
@@ -413,6 +419,11 @@ func (window *Window) handleKeyInput(ev *tcell.EventKey) {
 		}
 	} else if ev.Key() == tcell.KeyTab {
 		if window.CursorMode == CursorModeBuffer {
+			if !window.CurrentBuffer.canEdit {
+				window.PrintMessage(fmt.Sprintf("Buffer '%s' is read-only", window.CurrentBuffer.Name), TYPER_MESSAGE_WARNING)
+				return
+			}
+
 			// Remove selected text
 			if window.CurrentBuffer.Selection != nil {
 				window.CurrentBuffer.CutText(window)
@@ -422,6 +433,11 @@ func (window *Window) handleKeyInput(ev *tcell.EventKey) {
 		}
 	} else if ev.Key() == tcell.KeyEnter {
 		if window.CursorMode == CursorModeBuffer {
+			if !window.CurrentBuffer.canEdit {
+				window.PrintMessage(fmt.Sprintf("Buffer '%s' is read-only", window.CurrentBuffer.Name), TYPER_MESSAGE_WARNING)
+				return
+			}
+
 			// Remove selected text
 			if window.CurrentBuffer.Selection != nil {
 				window.CurrentBuffer.CutText(window)
@@ -441,6 +457,11 @@ func (window *Window) handleKeyInput(ev *tcell.EventKey) {
 		}
 	} else if ev.Key() == tcell.KeyRune {
 		if window.CursorMode == CursorModeBuffer {
+			if !window.CurrentBuffer.canEdit {
+				window.PrintMessage(fmt.Sprintf("Buffer '%s' is read-only", window.CurrentBuffer.Name), TYPER_MESSAGE_WARNING)
+				return
+			}
+
 			// Remove selected text
 			if window.CurrentBuffer.Selection != nil {
 				window.CurrentBuffer.CutText(window)