multi: remove old logger & restructure

- Remove the old logger implementation.
- Move various helper methods to util.go
- Rename slog.go to log.go
- remove travis config file

Author: ellemouton

.travis.yml

@@ -10,8 +10,6 @@ import (
 	"sync"
 	"sync/atomic"
 	"time"
-	"unicode"
-	"unicode/utf8"
 )
 
 const (
@@ -336,139 +334,3 @@ func appendTextValue(buf *buffer, v slog.Value) {
 		appendString(buf, fmt.Sprintf("%s", v))
 	}
 }
-
-// Copied from log/slog/text_handler.go.
-//
-// needsQuoting returns true if the given strings should be wrapped in quotes.
-func needsQuoting(s string) bool {
-	if len(s) == 0 {
-		return true
-	}
-	for i := 0; i < len(s); {
-		b := s[i]
-		if b < utf8.RuneSelf {
-			// Quote anything except a backslash that would need
-			// quoting in a JSON string, as well as space and '='.
-			if b != '\\' && (b == ' ' || b == '=' || !safeSet[b]) {
-				return true
-			}
-			i++
-			continue
-		}
-		r, size := utf8.DecodeRuneInString(s[i:])
-		if r == utf8.RuneError || unicode.IsSpace(r) ||
-			!unicode.IsPrint(r) {
-
-			return true
-		}
-		i += size
-	}
-	return false
-}
-
-// Copied from encoding/json/tables.go.
-//
-// safeSet holds the value true if the ASCII character with the given array
-// position can be represented inside a JSON string without any further
-// escaping.
-//
-// All values are true except for the ASCII control characters (0-31), the
-// double quote ("), and the backslash character ("\").
-var safeSet = [utf8.RuneSelf]bool{
-	' ':      true,
-	'!':      true,
-	'"':      false,
-	'#':      true,
-	'$':      true,
-	'%':      true,
-	'&':      true,
-	'\'':     true,
-	'(':      true,
-	')':      true,
-	'*':      true,
-	'+':      true,
-	',':      true,
-	'-':      true,
-	'.':      true,
-	'/':      true,
-	'0':      true,
-	'1':      true,
-	'2':      true,
-	'3':      true,
-	'4':      true,
-	'5':      true,
-	'6':      true,
-	'7':      true,
-	'8':      true,
-	'9':      true,
-	':':      true,
-	';':      true,
-	'<':      true,
-	'=':      true,
-	'>':      true,
-	'?':      true,
-	'@':      true,
-	'A':      true,
-	'B':      true,
-	'C':      true,
-	'D':      true,
-	'E':      true,
-	'F':      true,
-	'G':      true,
-	'H':      true,
-	'I':      true,
-	'J':      true,
-	'K':      true,
-	'L':      true,
-	'M':      true,
-	'N':      true,
-	'O':      true,
-	'P':      true,
-	'Q':      true,
-	'R':      true,
-	'S':      true,
-	'T':      true,
-	'U':      true,
-	'V':      true,
-	'W':      true,
-	'X':      true,
-	'Y':      true,
-	'Z':      true,
-	'[':      true,
-	'\\':     false,
-	']':      true,
-	'^':      true,
-	'_':      true,
-	'`':      true,
-	'a':      true,
-	'b':      true,
-	'c':      true,
-	'd':      true,
-	'e':      true,
-	'f':      true,
-	'g':      true,
-	'h':      true,
-	'i':      true,
-	'j':      true,
-	'k':      true,
-	'l':      true,
-	'm':      true,
-	'n':      true,
-	'o':      true,
-	'p':      true,
-	'q':      true,
-	'r':      true,
-	's':      true,
-	't':      true,
-	'u':      true,
-	'v':      true,
-	'w':      true,
-	'x':      true,
-	'y':      true,
-	'z':      true,
-	'{':      true,
-	'|':      true,
-	'}':      true,
-	'~':      true,
-	'\u007f': true,
-}