feat: analyze commits for conventional commit messages

commits.go

@@ -0,0 +1,55 @@
+package rp
+
+import (
+	"fmt"
+
+	"github.com/leodido/go-conventionalcommits"
+	"github.com/leodido/go-conventionalcommits/parser"
+)
+
+type AnalyzedCommit struct {
+	Commit
+	Type        string
+	Description string
+	Scope       *string
+}
+
+func AnalyzeCommits(commits []Commit) ([]AnalyzedCommit, conventionalcommits.VersionBump, error) {
+	parserMachine := parser.NewMachine(
+		parser.WithBestEffort(),
+		parser.WithTypes(conventionalcommits.TypesConventional),
+	)
+
+	analyzedCommits := make([]AnalyzedCommit, 0, len(commits))
+
+	highestVersionBump := conventionalcommits.UnknownVersion
+
+	for _, commit := range commits {
+		msg, err := parserMachine.Parse([]byte(commit.Message))
+		if err != nil {
+			return nil, conventionalcommits.UnknownVersion, fmt.Errorf("failed to parse message of commit %q: %w", commit.Hash, err)
+		}
+		conventionalCommit, ok := msg.(*conventionalcommits.ConventionalCommit)
+		if !ok {
+			return nil, conventionalcommits.UnknownVersion, fmt.Errorf("unable to get ConventionalCommit from parser result: %T", msg)
+		}
+
+		commitVersionBump := conventionalCommit.VersionBump(conventionalcommits.DefaultStrategy)
+		if commitVersionBump > conventionalcommits.UnknownVersion {
+			// We only care about releasable commits
+			analyzedCommits = append(analyzedCommits, AnalyzedCommit{
+				Commit:      commit,
+				Type:        conventionalCommit.Type,
+				Description: conventionalCommit.Description,
+				Scope:       conventionalCommit.Scope,
+			})
+		}
+
+		if commitVersionBump > highestVersionBump {
+			// Get max version bump from all releasable commits
+			highestVersionBump = commitVersionBump
+		}
+	}
+
+	return analyzedCommits, highestVersionBump, nil
+}