From 3efa1fc8a98d2d90c204c7bd5a0e2519e1ac7745 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Wed, 22 Nov 2017 22:04:14 -0500
Subject: split the parser up, and have read methods like write emethods

---
 cmd_comment.go | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 66 insertions(+), 1 deletion(-)

(limited to 'cmd_comment.go')

diff --git a/cmd_comment.go b/cmd_comment.go
index d783ecc..6ce801c 100644
--- a/cmd_comment.go
+++ b/cmd_comment.go
@@ -1,11 +1,15 @@
 package libfastimport
 
 import (
+	"fmt"
 	"strconv"
+	"strings"
 
 	"git.lukeshu.com/go/libfastimport/textproto"
 )
 
+// comment /////////////////////////////////////////////////////////////////////
+
 type CmdComment struct {
 	Comment string
 }
@@ -14,6 +18,16 @@ func (c CmdComment) fiCmdClass() cmdClass { return cmdClassComment }
 func (c CmdComment) fiCmdWrite(fiw *textproto.FIWriter) error {
 	return fiw.WriteLine("#" + c.Comment)
 }
+func init() { parser_registerCmd("#", CmdComment{}) }
+func (CmdComment) fiCmdRead(fir fiReader) (cmd Cmd, err error) {
+	line, err := fir.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	return CmdComment{Comment: trimLinePrefix(line, "#")}, nil
+}
+
+// get-mark ////////////////////////////////////////////////////////////////////
 
 type CmdGetMark struct {
 	Mark int
@@ -23,6 +37,21 @@ func (c CmdGetMark) fiCmdClass() cmdClass { return cmdClassComment }
 func (c CmdGetMark) fiCmdWrite(fiw *textproto.FIWriter) error {
 	return fiw.WriteLine("get-mark", ":"+strconv.Itoa(c.Mark))
 }
+func init() { parser_registerCmd("get-mark :", CmdGetMark{}) }
+func (CmdGetMark) fiCmdRead(fir fiReader) (cmd Cmd, err error) {
+	line, err := fir.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	c := CmdGetMark{}
+	c.Mark, err = strconv.Atoi(trimLinePrefix(line, "get-mark :"))
+	if err != nil {
+		return nil, fmt.Errorf("get-mark: %v", err)
+	}
+	return c, nil
+}
+
+// cat-blob ////////////////////////////////////////////////////////////////////
 
 type CmdCatBlob struct {
 	DataRef string
@@ -32,12 +61,30 @@ func (c CmdCatBlob) fiCmdClass() cmdClass { return cmdClassComment }
 func (c CmdCatBlob) fiCmdWrite(fiw *textproto.FIWriter) error {
 	return fiw.WriteLine("cat-blob", c.DataRef)
 }
+func init() { parser_registerCmd("cat-blob ", CmdCatBlob{}) }
+func (CmdCatBlob) fiCmdRead(fir fiReader) (cmd Cmd, err error) {
+	line, err := fir.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	return CmdCatBlob{DataRef: trimLinePrefix(line, "cat-blob ")}, nil
+}
+
+// ls //////////////////////////////////////////////////////////////////////////
 
 type CmdLs struct {
 	DataRef string // optional if inside of a commit
 	Path    textproto.Path
 }
 
+// If you're thinking "but wait, parser_registerCmd will see CmdLs as
+// cmdClassCommit, not cmdClassComment, that means it won't be allowed
+// embedded inside other commands! (while still allowing it both
+// inside and outside of a commit)", you're absolutely correct.
+// That's the desired behavior.  It's a happy accident that the little
+// fiCmdClass hack works out that way, instead of having to add even
+// more complexity.
+
 func (c CmdLs) fiCmdClass() cmdClass {
 	if c.DataRef == "" {
 		return cmdClassCommit
@@ -51,4 +98,22 @@ func (c CmdLs) fiCmdWrite(fiw *textproto.FIWriter) error {
 		return fiw.WriteLine("ls", c.DataRef, c.Path)
 	}
 }
-
+func init() { parser_registerCmd("ls ", CmdLs{}) }
+func (CmdLs) fiCmdRead(fir fiReader) (cmd Cmd, err error) {
+	// 'ls' SP <dataref> SP <path> LF
+	line, err := fir.ReadLine()
+	if err != nil {
+		return nil, err
+	}
+	str := trimLinePrefix(line, "ls ")
+	sp := -1
+	if !strings.HasPrefix(str, "\"") {
+		sp = strings.IndexByte(line, ' ')
+	}
+	c := CmdLs{}
+	c.Path = textproto.PathUnescape(str[sp+1:])
+	if sp >= 0 {
+		c.DataRef = str[:sp]
+	}
+	return c, nil
+}
-- 
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