Remove the word middleware (#1067)

* Rename middleware to plugin

first pass; mostly used 'sed', few spots where I manually changed
text.

This still builds a coredns binary.

* fmt error

* Rename AddMiddleware to AddPlugin

* Readd AddMiddleware to remain backwards compat

1 files changed, 0 insertions, 59 deletions

diff --git a/middleware/file/tree/less.go b/middleware/file/tree/less.go
deleted file mode 100644
index 3b8340088..000000000
--- a/middleware/file/tree/less.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package tree
-
-import (
-	"bytes"
-
-	"github.com/miekg/dns"
-)
-
-// less returns <0 when a is less than b, 0 when they are equal and
-// >0 when a is larger than b.
-// The function orders names in DNSSEC canonical order: RFC 4034s section-6.1
-//
-// See http://bert-hubert.blogspot.co.uk/2015/10/how-to-do-fast-canonical-ordering-of.html
-// for a blog article on this implementation, although here we still go label by label.
-//
-// The values of a and b are *not* lowercased before the comparison!
-func less(a, b string) int {
-	i := 1
-	aj := len(a)
-	bj := len(b)
-	for {
-		ai, oka := dns.PrevLabel(a, i)
-		bi, okb := dns.PrevLabel(b, i)
-		if oka && okb {
-			return 0
-		}
-
-		// sadly this []byte will allocate... TODO(miek): check if this is needed
-		// for a name, otherwise compare the strings.
-		ab := []byte(a[ai:aj])
-		bb := []byte(b[bi:bj])
-		doDDD(ab)
-		doDDD(bb)
-
-		res := bytes.Compare(ab, bb)
-		if res != 0 {
-			return res
-		}
-
-		i++
-		aj, bj = ai, bi
-	}
-}
-
-func doDDD(b []byte) {
-	lb := len(b)
-	for i := 0; i < lb; i++ {
-		if i+3 < lb && b[i] == '\\' && isDigit(b[i+1]) && isDigit(b[i+2]) && isDigit(b[i+3]) {
-			b[i] = dddToByte(b[i:])
-			for j := i + 1; j < lb-3; j++ {
-				b[j] = b[j+3]
-			}
-			lb -= 3
-		}
-	}
-}
-
-func isDigit(b byte) bool     { return b >= '0' && b <= '9' }
-func dddToByte(s []byte) byte { return (s[1]-'0')*100 + (s[2]-'0')*10 + (s[3] - '0') }