From 6a27593800438c104b139685b332b7084f550a30 Mon Sep 17 00:00:00 2001
From: Zachary Yedidia <zyedidia@gmail.com>
Date: Sun, 20 Mar 2016 15:24:40 -0400
Subject: [PATCH] Load syntax rules from file

---
 highlighter.go | 43 ++++++++++++++++++++-----------------------
 micro.go       | 13 +++++++++++--
 view.go        | 10 +++++++---
 3 files changed, 38 insertions(+), 28 deletions(-)

diff --git a/highlighter.go b/highlighter.go
index 003c7bdc..1da383a2 100644
--- a/highlighter.go
+++ b/highlighter.go
@@ -1,40 +1,35 @@
 package main
 
 import (
-	"fmt"
 	"github.com/gdamore/tcell"
+	"io/ioutil"
 	"regexp"
 	"strings"
 )
 
+var syntaxRules string
+
+func GetRules() string {
+	file, err := ioutil.ReadFile("syntax.micro")
+	if err != nil {
+		return ""
+	}
+	return string(file)
+}
+
 // Match ...
 func Match(str string) map[int]tcell.Style {
-	rules := `color blue "[A-Za-z_][A-Za-z0-9_]*[[:space:]]*[()]"
-color blue "\b(append|cap|close|complex|copy|delete|imag|len)\b"
-color blue "\b(make|new|panic|print|println|protect|real|recover)\b"
-color green     "\b(u?int(8|16|32|64)?|float(32|64)|complex(64|128))\b"
-color green     "\b(uintptr|byte|rune|string|interface|bool|map|chan|error)\b"
-color cyan  "\b(package|import|const|var|type|struct|func|go|defer|nil|iota)\b"
-color cyan  "\b(for|range|if|else|case|default|switch|return)\b"
-color red     "\b(go|goto|break|continue)\b"
-color cyan "\b(true|false)\b"
-color red "[-+/*=<>!~%&|^]|:="
-color blue   "\b([0-9]+|0x[0-9a-fA-F]*)\b|'.'"
-color magenta   "\\([0-7]{3}|x[A-Fa-f0-9]{2}|u[A-Fa-f0-9]{4}|U[A-Fa-f0-9]{8})"
-color yellow   "` + "`" + `[^` + "`" + `]*` + "`" + `"
-color green "(^|[[:space:]])//.*"
-color brightwhite,cyan "TODO:?"
-color ,green "[[:space:]]+$"
-color ,red "	+ +| +	+"`
+	rules := strings.TrimSpace(GetRules())
 
 	lines := strings.Split(rules, "\n")
 	m := make(map[int]tcell.Style)
+	parser, _ := regexp.Compile(`color (.*?)\s+"(.*)"`)
 	for _, line := range lines {
-		split := strings.Split(line, "\"")
-		color := strings.Split(split[0], " ")[1]
-		regex, err := regexp.Compile(split[1])
+		submatch := parser.FindSubmatch([]byte(line))
+		color := string(submatch[1])
+		regex, err := regexp.Compile(string(submatch[2]))
 		if err != nil {
-			fmt.Println("\a")
+			continue
 			// Error with the regex!
 		}
 		st := StringToStyle(color)
@@ -48,7 +43,9 @@ color ,red "	+ +| +	+"`
 					}
 				}
 				m[value[0]] = st
-				m[value[1]] = tcell.StyleDefault
+				if _, exists := m[value[1]]; !exists {
+					m[value[1]] = tcell.StyleDefault
+				}
 			}
 		}
 	}
diff --git a/micro.go b/micro.go
index f8958f76..32d2d828 100644
--- a/micro.go
+++ b/micro.go
@@ -2,11 +2,11 @@ package main
 
 import (
 	"fmt"
+	"github.com/gdamore/tcell"
+	"github.com/go-errors/errors"
 	"github.com/mattn/go-isatty"
 	"io/ioutil"
 	"os"
-
-	"github.com/gdamore/tcell"
 )
 
 const (
@@ -47,6 +47,15 @@ func main() {
 		os.Exit(1)
 	}
 
+	defer func() {
+		if err := recover(); err != nil {
+			s.Fini()
+			fmt.Println("Micro encountered an error:", err)
+			fmt.Print(errors.Wrap(err, 2).ErrorStack())
+			os.Exit(1)
+		}
+	}()
+
 	defStyle := tcell.StyleDefault.
 		Background(tcell.ColorDefault).
 		Foreground(tcell.ColorDefault)
diff --git a/view.go b/view.go
index 3566b51e..657bc4df 100644
--- a/view.go
+++ b/view.go
@@ -309,7 +309,7 @@ func (v *View) Display() {
 	// + 1 for the little space after the line number
 	v.lineNumOffset = maxLineLength + 1
 
-	var lineStyle tcell.Style
+	var highlightStyle tcell.Style
 
 	for lineN := 0; lineN < v.height; lineN++ {
 		if lineN+v.topline >= len(v.buf.lines) {
@@ -337,15 +337,19 @@ func (v *View) Display() {
 		// Write the line
 		tabchars := 0
 		for _, ch := range line {
+			var lineStyle tcell.Style
 			st, ok := matches[charNum]
 			if ok {
-				lineStyle = st
+				highlightStyle = st
 			}
 
 			if v.cursor.HasSelection() &&
 				(charNum >= v.cursor.selectionStart && charNum <= v.cursor.selectionEnd ||
 					charNum <= v.cursor.selectionStart && charNum >= v.cursor.selectionEnd) {
+				lineStyle = tcell.StyleDefault
 				lineStyle = lineStyle.Reverse(true)
+			} else {
+				lineStyle = highlightStyle
 			}
 
 			if ch == '\t' {
@@ -363,7 +367,7 @@ func (v *View) Display() {
 		x = 0
 		st, ok := matches[charNum]
 		if ok {
-			lineStyle = st
+			highlightStyle = st
 		}
 		charNum++
 	}