From 5e1e95852821e138caf20c3f8ee23e3941e42bbc Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@sbcglobal.net>
Date: Tue, 15 Nov 2016 00:16:06 -0500
Subject: better progressive enhancement of editor

---
 src/edit/enhancers.go | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/edit/enhancers.go

(limited to 'src/edit/enhancers.go')

diff --git a/src/edit/enhancers.go b/src/edit/enhancers.go
new file mode 100644
index 0000000..b732ab2
--- /dev/null
+++ b/src/edit/enhancers.go
@@ -0,0 +1,79 @@
+package main
+
+import (
+	"io"
+	"io/ioutil"
+	"os"
+	"mime/multipart"
+	"strings"
+	"path"
+
+	"fmt"
+)
+
+type enhancer struct {
+	pattern []string
+	head    string
+	tail    string
+}
+
+func loadEnhancers(filename string) []enhancer {
+	file, err := os.Open(filename)
+	errcheck(err)
+
+	reader := multipart.NewReader(file, "boundary")
+	
+	var s uint8 = 0
+	var e enhancer
+	var ret []enhancer
+	for {
+		part, err := reader.NextPart()
+		if err == io.EOF {
+			return ret
+		}
+		errcheck(err)
+		
+		k := part.Header.Get("X-Thing")
+		v, err := ioutil.ReadAll(part)
+		errcheck(err)
+
+		switch k {
+		case "Pattern":
+			patterns := strings.Split(string(v), ";")
+			for i := range patterns {
+				patterns[i] = strings.TrimSpace(patterns[i])
+			}
+			s |= 1<<0
+			e.pattern = patterns
+		case "Head":
+			s |= 1<<1
+			e.head = string(v)
+		case "Tail":
+			s |= 1<<2
+			e.tail = string(v)
+		default:
+			panic("unknown X-Thing: "+k)
+		}
+		if s == 1<<0 | 1<<1 | 1<<2 {
+			ret = append(ret, e)
+			s = 0
+		}
+	}
+}
+
+var enhancers = loadEnhancers("enhancers.txt")
+
+func getEnhancer(ctype string) (head, tail string) {
+	fmt.Fprintf(os.Stderr, "enhancers = %q\n", enhancers)
+	for _, enhancer := range enhancers {
+		for _, pattern := range enhancer.pattern {
+			matched, err := path.Match(pattern, ctype)
+			errcheck(err)
+			fmt.Fprintf(os.Stderr, "Match(%q, %q) => %q\n", pattern, ctype, matched)
+			if matched {
+				return enhancer.head, enhancer.tail
+			}
+		}
+	}
+	return "", ""
+}
-- 
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