github: working incremental + comment history for the first comment

2 files changed, 72 insertions, 1 deletions

diff --git a/cache/bug_cache.go b/cache/bug_cache.go
index b7c80a0c..52e9eafb 100644
--- a/cache/bug_cache.go
+++ b/cache/bug_cache.go
@@ -1,6 +1,8 @@
 package cache
 
 import (
+	"fmt"
+	"strings"
 	"time"
 
 	"github.com/MichaelMure/git-bug/bug"
@@ -35,6 +37,51 @@ func (c *BugCache) notifyUpdated() error {
 	return c.repoCache.bugUpdated(c.bug.Id())
 }
 
+var ErrNoMatchingOp = fmt.Errorf("no matching operation found")
+
+type ErrMultipleMatchOp struct {
+	Matching []git.Hash
+}
+
+func (e ErrMultipleMatchOp) Error() string {
+	casted := make([]string, len(e.Matching))
+
+	for i := range e.Matching {
+		casted[i] = string(e.Matching[i])
+	}
+
+	return fmt.Sprintf("Multiple matching operation found:\n%s", strings.Join(casted, "\n"))
+}
+
+// ResolveTargetWithMetadata will find an operation that has the matching metadata
+func (c *BugCache) ResolveTargetWithMetadata(key string, value string) (git.Hash, error) {
+	// preallocate but empty
+	matching := make([]git.Hash, 0, 5)
+
+	it := bug.NewOperationIterator(c.bug)
+	for it.Next() {
+		op := it.Value()
+		opValue, ok := op.GetMetadata(key)
+		if ok && value == opValue {
+			h, err := op.Hash()
+			if err != nil {
+				return "", err
+			}
+			matching = append(matching, h)
+		}
+	}
+
+	if len(matching) == 0 {
+		return "", ErrNoMatchingOp
+	}
+
+	if len(matching) > 1 {
+		return "", ErrMultipleMatchOp{Matching: matching}
+	}
+
+	return matching[0], nil
+}
+
 func (c *BugCache) AddComment(message string) error {
 	return c.AddCommentWithFiles(message, nil)
 }
diff --git a/cache/repo_cache.go b/cache/repo_cache.go
index 74fc87c0..2cb6a030 100644
--- a/cache/repo_cache.go
+++ b/cache/repo_cache.go
@@ -244,7 +244,31 @@ func (c *RepoCache) ResolveBugPrefix(prefix string) (*BugCache, error) {
 	}
 
 	if len(matching) > 1 {
-		return nil, fmt.Errorf("Multiple matching bug found:\n%s", strings.Join(matching, "\n"))
+		return nil, bug.ErrMultipleMatch{Matching: matching}
+	}
+
+	if len(matching) == 0 {
+		return nil, bug.ErrBugNotExist
+	}
+
+	return c.ResolveBug(matching[0])
+}
+
+// ResolveBugCreateMetadata retrieve a bug that has the exact given metadata on
+// its Create operation, that is, the first operation. It fails if multiple bugs
+// match.
+func (c *RepoCache) ResolveBugCreateMetadata(key string, value string) (*BugCache, error) {
+	// preallocate but empty
+	matching := make([]string, 0, 5)
+
+	for id, excerpt := range c.excerpts {
+		if excerpt.CreateMetadata[key] == value {
+			matching = append(matching, id)
+		}
+	}
+
+	if len(matching) > 1 {
+		return nil, bug.ErrMultipleMatch{Matching: matching}
 	}
 
 	if len(matching) == 0 {