support comments (#8)

* support comments

internal/build/version.go

@@ -7,6 +7,8 @@
 package build
 
 import (
+	"encoding/binary"
+	"encoding/hex"
 	"flag"
 	"fmt"
 	"os"
@@ -21,6 +23,7 @@ var (
 	buildTimestamp  string
 	machine         string
 	commit          string
+	commitTag       uint32
 	commitTimestamp string
 	version         string
 	number          string
@@ -52,6 +55,11 @@ func Commit() string {
 	return commit
 }
 
+// appropriate for inserting into statshouse raw key
+func CommitTag() uint32 {
+	return commitTag
+}
+
 // UNIX timestampt seconds, so stable in any TZ
 func CommitTimestamp() uint32 {
 	return commitTimestampUint32
@@ -82,6 +90,10 @@ func init() {
 	ts, _ := strconv.ParseUint(commitTimestamp, 10, 32)
 	commitTimestampUint32 = uint32(ts)
 
+	if commitTagRaw, _ := hex.DecodeString(commit); len(commitTagRaw) >= 4 {
+		commitTag = binary.BigEndian.Uint32(commitTagRaw[:])
+	}
+
 	if buildTimestamp != "" {
 		ts, _ = strconv.ParseUint(buildTimestamp, 10, 32)
 		buildTimestampUint32 = uint32(ts)

internal/tlast/tlparser.go

@@ -102,6 +102,9 @@ type Field struct {
 
 	PR     PositionRange
 	PRName PositionRange
+
+	CommentBefore string // comment before field
+	CommentRight  string // comment to the right of field
 }
 
 type Combinator struct {
@@ -119,6 +122,9 @@ type Combinator struct {
 
 	TemplateArgumentsPR PositionRange // especially useful when 0 arguments
 	PR                  PositionRange
+
+	CommentBefore string // comment before combinator
+	CommentRight  string // comment to the right of combinator
 }
 
 type TL []*Combinator