prototype syntax highlighter semi works!

cfg/config.go

@@ -1,6 +1,7 @@
 package cfg
 
 import (
+	"errors"
 	"log"
 	"runtime"
 	"strconv"
@@ -8,11 +9,32 @@ import (
 )
 
 type TomlConfig struct {
-	Editor   EditorConfig
-	Cursor   CursorConfig
-	Render   RenderConfig
-	Theme    ThemeConfig
-	Commands map[string]Command
+	Editor       EditorConfig                         `toml:"editor"`
+	Cursor       CursorConfig                         `toml:"cursor"`
+	Render       RenderConfig                         `toml:"render"`
+	Theme        ThemeConfig                          `toml:"theme"`
+	Associations map[string]FileAssociations          `toml:"file_associations"`
+	Commands     map[string]Command                   `toml:"commands"`
+	Syntax       map[string]map[string]SyntaxCriteria `toml:"syntax"`
+
+	// this maps ext => language
+	// when we have file associations from
+	// the Associations field we take
+	// each extension and put them here
+	// pointing it to the language.
+	// basically the reverse/opposite
+	associations map[string]string
+}
+
+func (t *TomlConfig) GetLanguageFromExt(ext string) (string, error) {
+	if val, ok := t.associations[ext]; ok {
+		return val, nil
+	}
+	return "", errors.New("no language for extension '" + ext + "'")
+}
+
+type FileAssociations struct {
+	Extensions []string
 }
 
 var DEFUALT_TOML_CONFIG string = getDefaultConfig()
@@ -31,6 +53,11 @@ func getDefaultConfig() string {
 	return DEFAULT_WINDOWS_TOML_CONFIG
 }
 
+type SyntaxCriteria struct {
+	Colour int      `toml:"colouring"`
+	Match  []string `toml:"match"`
+}
+
 type Command struct {
 	Shortcut string
 }

cfg/loader.go

@@ -36,10 +36,10 @@ var Shortcuts = &shortcutRegister{
 	Controls: map[string]string{},
 }
 
-func configureAndValidate(conf TomlConfig) {
+func configureAndValidate(conf *TomlConfig) {
+	// config & validate the keyboard shortcuts
+	log.Println("Configuring keyboard shortcuts")
 	{
-		log.Println("Configuring keyboard shortcuts")
-
 		// keyboard commands
 		for commandName, cmd := range conf.Commands {
 			shortcut := cmd.Shortcut
@@ -55,6 +55,27 @@ func configureAndValidate(conf TomlConfig) {
 			}
 		}
 	}
+
+	log.Println("Syntax Highlighting")
+	{
+		conf.associations = map[string]string{}
+
+		for lang, extSet := range conf.Associations {
+			log.Println(lang, "=>", extSet.Extensions)
+
+			for _, ext := range extSet.Extensions {
+				log.Println("registering", ext, "as", lang)
+				conf.associations[ext] = lang
+			}
+		}
+
+		for name, conf := range conf.Syntax {
+			log.Println(name + ":")
+			for name, val := range conf {
+				log.Println(name, val)
+			}
+		}
+	}
 }
 
 func Setup() TomlConfig {
@@ -103,6 +124,6 @@ func Setup() TomlConfig {
 		panic(err)
 	}
 
-	configureAndValidate(conf)
+	configureAndValidate(&conf)
 	return conf
 }

gui/buffer.go

@@ -3,6 +3,7 @@ package gui
 import (
 	"io/ioutil"
 	"log"
+	"path"
 	"strings"
 	"time"
 	"unicode"
@@ -38,6 +39,8 @@ type Buffer struct {
 	cfg      *cfg.TomlConfig
 	cam      *camera
 	filePath string
+
+	languageInfo string
 }
 
 func NewBuffer(conf *cfg.TomlConfig, parent *View, index int) *Buffer {
@@ -63,6 +66,17 @@ func NewBuffer(conf *cfg.TomlConfig, parent *View, index int) *Buffer {
 func (b *Buffer) OpenFile(filePath string) {
 	b.filePath = filePath
 
+	log.Println("Opening file ", filePath)
+
+	ext := path.Ext(filePath)
+	lang, err := b.cfg.GetLanguageFromExt(ext)
+	if err != nil {
+		log.Println(err.Error())
+	} else {
+		log.Println("- this file is a ", lang, " language program")
+		b.languageInfo = lang
+	}
+
 	contents, err := ioutil.ReadFile(filePath)
 	if err != nil {
 		panic(err)
@@ -717,8 +731,42 @@ func (b *Buffer) renderAt(ctx *strife.Renderer, rx int, ry int) {
 			continue
 		}
 
+		source := []rune(rope.String())
+
+		// char index => colour
+		matches := map[int]int{}
+
+		subjects := [][]string{}
+		colours := []int{}
+
+		stuff := b.cfg.Syntax[b.languageInfo]
+		for _, criteria := range stuff {
+			colours = append(colours, criteria.Colour)
+			subj := criteria.Match
+			subjects = append(subjects, subj)
+		}
+
+		// HOLY SLOW BATMAN
+		for idx, _ := range source {
+			for syntaxIndex, syntax := range subjects {
+				for _, subject := range syntax {
+					if idx+len(subject) > len(source) {
+						continue
+					}
+
+					a := source[idx : idx+len(subject)]
+					if strings.Compare(string(a), subject) == 0 {
+						for i := 0; i < len(subject); i++ {
+							matches[i+idx] = colours[syntaxIndex]
+						}
+						idx += len(subject)
+					}
+				}
+			}
+		}
+
 		var x_col int
-		for _, char := range rope.String() {
+		for idx, char := range source {
 			switch char {
 			case '\n':
 				x_col = 0
@@ -739,6 +787,9 @@ func (b *Buffer) renderAt(ctx *strife.Renderer, rx int, ry int) {
 			if b.HasFocus && b.curs.x+1 == x_col && b.curs.y == y_col && should_draw {
 				ctx.SetColor(strife.HexRGB(b.cfg.Theme.Cursor_Invert))
 			}
+			if col, ok := matches[idx]; ok {
+				ctx.SetColor(strife.HexRGB(int32(col)))
+			}
 
 			last_w, last_h = ctx.String(string(char), (rx + ((x_col - 1) * last_w)), (ry + (y_col * last_h)))
 		}