feat: Add changelog command for archive comparison

cmd/changelog.go

@@ -0,0 +1,157 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/Snider/Borg/pkg/changelog"
+	"github.com/Snider/Borg/pkg/datanode"
+	"github.com/Snider/Borg/pkg/tim"
+	"github.com/Snider/Borg/pkg/trix"
+	"github.com/Snider/Borg/pkg/vcs"
+	"github.com/spf13/cobra"
+)
+
+var changelogCmd = NewChangelogCmd()
+
+func NewChangelogCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "changelog [old] [new]",
+		Short: "Generate a changelog between two archives",
+		Args: func(cmd *cobra.Command, args []string) error {
+			source, _ := cmd.Flags().GetString("source")
+			if source != "" {
+				if len(args) != 1 {
+					return errors.New("accepts one archive when --source is set")
+				}
+			} else {
+				if len(args) != 2 {
+					return errors.New("accepts two archives when --source is not set")
+				}
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			format, _ := cmd.Flags().GetString("format")
+			password, _ := cmd.Flags().GetString("password")
+			source, _ := cmd.Flags().GetString("source")
+
+			var oldNode, newNode *datanode.DataNode
+			var err error
+
+			if source != "" {
+				oldNode, err = getDataNode(args[0], password)
+				if err != nil {
+					return fmt.Errorf("failed to read old archive: %w", err)
+				}
+				newNode, err = getDataNodeFromSource(source)
+				if err != nil {
+					return fmt.Errorf("failed to read source: %w", err)
+				}
+			} else {
+				oldNode, err = getDataNode(args[0], password)
+				if err != nil {
+					return fmt.Errorf("failed to read old archive: %w", err)
+				}
+				newNode, err = getDataNode(args[1], password)
+				if err != nil {
+					return fmt.Errorf("failed to read new archive: %w", err)
+				}
+			}
+
+			report, err := changelog.GenerateReport(oldNode, newNode)
+			if err != nil {
+				return fmt.Errorf("failed to generate changelog: %w", err)
+			}
+
+			var output string
+			switch format {
+			case "markdown":
+				output, err = changelog.FormatAsMarkdown(report)
+			case "json":
+				output, err = changelog.FormatAsJSON(report)
+			default:
+				output, err = changelog.FormatAsText(report)
+			}
+
+			if err != nil {
+				return fmt.Errorf("failed to format changelog: %w", err)
+			}
+
+			fmt.Fprint(os.Stdout, output)
+
+			return nil
+		},
+	}
+
+	cmd.Flags().String("format", "text", "Output format (text, markdown, json)")
+	cmd.Flags().String("password", "", "Password for encrypted archives")
+	cmd.Flags().String("source", "", "Remote source to compare against (e.g., github:org/repo)")
+
+	return cmd
+}
+
+func getDataNode(filePath, password string) (*datanode.DataNode, error) {
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	// Handle .stim files
+	if strings.HasSuffix(filePath, ".stim") || (len(data) >= 4 && string(data[:4]) == "STIM") {
+		if password == "" {
+			return nil, fmt.Errorf("password required for .stim files")
+		}
+		m, err := tim.FromSigil(data, password)
+		if err != nil {
+			return nil, err
+		}
+		tarball, err := m.ToTar()
+		if err != nil {
+			return nil, err
+		}
+		return datanode.FromTar(tarball)
+	}
+
+	// Handle .trix files
+	if strings.HasSuffix(filePath, ".trix") {
+		dn, err := trix.FromTrix(data, password)
+		if err != nil {
+			return nil, err
+		}
+		return dn, nil
+	}
+
+	// Assume it's a tarball
+	return datanode.FromTar(data)
+}
+
+func getDataNodeFromSource(source string) (*datanode.DataNode, error) {
+	parts := strings.SplitN(source, ":", 2)
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("invalid source format: %s", source)
+	}
+
+	sourceType := parts[0]
+	sourcePath := parts[1]
+
+	switch sourceType {
+	case "github":
+		url := "https://" + sourceType + ".com/" + sourcePath
+		gitCloner := vcs.NewGitCloner()
+		return gitCloner.CloneGitRepository(url, os.Stdout)
+	default:
+		return nil, fmt.Errorf("unsupported source type: %s", sourceType)
+	}
+}
+
+
+func GetChangelogCmd() *cobra.Command {
+	return changelogCmd
+}
+
+func init() {
+	RootCmd.AddCommand(GetChangelogCmd())
+}

go.mod

@@ -5,7 +5,7 @@ go 1.25.0
 require (
 	github.com/Snider/Enchantrix v0.0.2
 	github.com/fatih/color v1.18.0
-	github.com/go-git/go-git/v5 v5.16.3
+	github.com/go-git/go-git/v5 v5.16.4
 	github.com/google/go-github/v39 v39.2.0
 	github.com/klauspost/compress v1.18.2
 	github.com/mattn/go-isatty v0.0.20
@@ -25,6 +25,7 @@ require (
 	github.com/bep/debounce v1.2.1 // indirect
 	github.com/cloudflare/circl v1.6.1 // indirect
 	github.com/cyphar/filepath-securejoin v0.4.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
 	github.com/go-git/go-billy/v5 v5.6.2 // indirect
@@ -49,11 +50,13 @@ require (
 	github.com/pjbgf/sha1cd v0.3.2 // indirect
 	github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
 	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/samber/lo v1.49.1 // indirect
 	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
 	github.com/skeema/knownhosts v1.3.1 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/stretchr/testify v1.11.1 // indirect
 	github.com/tkrajina/go-reflector v0.5.8 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.2 // indirect
@@ -65,4 +68,5 @@ require (
 	golang.org/x/term v0.37.0 // indirect
 	golang.org/x/text v0.31.0 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -39,6 +39,8 @@ github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMj
 github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
 github.com/go-git/go-git/v5 v5.16.3 h1:Z8BtvxZ09bYm/yYNgPKCzgWtaRqDTgIKRgIRHBfU6Z8=
 github.com/go-git/go-git/v5 v5.16.3/go.mod h1:4Ge4alE/5gPs30F2H1esi2gPd69R0C39lolkucHBOp8=
+github.com/go-git/go-git/v5 v5.16.4 h1:7ajIEZHZJULcyJebDLo99bGgS0jRrOxzZG4uCk2Yb2Y=
+github.com/go-git/go-git/v5 v5.16.4/go.mod h1:4Ge4alE/5gPs30F2H1esi2gPd69R0C39lolkucHBOp8=
 github.com/go-ole/go-ole v1.3.0 h1:Dt6ye7+vXGIKZ7Xtk4s6/xVdGDQynvom7xCFEdWr6uE=
 github.com/go-ole/go-ole v1.3.0/go.mod h1:5LS6F96DhAwUc7C+1HLexzMXY1xGRSryjyPPKW6zv78=
 github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=