Fix task fingerprinting to account for the dir sources and generates

Author: Matt Keeler

internal/fingerprint/fingerprint_key.go

@@ -0,0 +1,60 @@
+package fingerprint
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/zeebo/xxh3"
+
+	"github.com/go-task/task/v3/taskfile/ast"
+)
+
+type fingerprintIdentity struct {
+	Task      string   `json:"task"`
+	Dir       string   `json:"dir"`
+	Sources   []string `json:"sources,omitempty"`
+	Generates []string `json:"generates,omitempty"`
+}
+
+func taskFingerprintKey(t *ast.Task) string {
+	name := taskIdentityName(t)
+	identity := fingerprintIdentity{
+		Task:      name,
+		Dir:       t.Dir,
+		Sources:   globPatterns(t.Sources),
+		Generates: globPatterns(t.Generates),
+	}
+
+	encoded, err := json.Marshal(identity)
+	if err != nil {
+		return normalizeFilename(name)
+	}
+
+	return normalizeFilename(fmt.Sprintf("%s-%x", name, xxh3.Hash(encoded)))
+}
+
+func taskIdentityName(t *ast.Task) string {
+	if t.FullName != "" {
+		return t.FullName
+	}
+	return t.Task
+}
+
+func globPatterns(globs []*ast.Glob) []string {
+	if len(globs) == 0 {
+		return nil
+	}
+
+	patterns := make([]string, 0, len(globs))
+	for _, glob := range globs {
+		if glob == nil {
+			continue
+		}
+		if glob.Negate {
+			patterns = append(patterns, "!"+glob.Glob)
+			continue
+		}
+		patterns = append(patterns, glob.Glob)
+	}
+	return patterns
+}

internal/fingerprint/sources_checksum.go

@@ -115,7 +115,7 @@ func (c *ChecksumChecker) checksum(t *ast.Task) (string, error) {
 }
 
 func (checker *ChecksumChecker) checksumFilePath(t *ast.Task) string {
-	return filepath.Join(checker.tempDir, "checksum", normalizeFilename(t.Name()))
+	return filepath.Join(checker.tempDir, "checksum", taskFingerprintKey(t))
 }
 
 var checksumFilenameRegexp = regexp.MustCompile("[^A-z0-9]")

internal/fingerprint/sources_timestamp.go

@@ -147,5 +147,5 @@ func (*TimestampChecker) OnError(t *ast.Task) error {
 }
 
 func (checker *TimestampChecker) timestampFilePath(t *ast.Task) string {
-	return filepath.Join(checker.tempDir, "timestamp", normalizeFilename(t.Task))
+	return filepath.Join(checker.tempDir, "timestamp", taskFingerprintKey(t))
 }