rename file.go to status.go, and move related code there

status.go

@@ -0,0 +1,132 @@
+package task
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/go-task/task/execext"
+	"github.com/mattn/go-zglob"
+)
+
+func (e *Executor) isTaskUpToDate(ctx context.Context, t *Task) (bool, error) {
+	if len(t.Status) > 0 {
+		return e.isUpToDateStatus(ctx, t)
+	}
+	return e.isUpToDateTimestamp(ctx, t)
+}
+
+func (e *Executor) isUpToDateStatus(ctx context.Context, t *Task) (bool, error) {
+	for _, s := range t.Status {
+		err := execext.RunCommand(&execext.RunCommandOptions{
+			Context: ctx,
+			Command: s,
+			Dir:     e.getTaskDir(t),
+			Env:     e.getEnviron(t),
+		})
+		if err != nil {
+			return false, nil
+		}
+	}
+	return true, nil
+}
+
+func (e *Executor) isUpToDateTimestamp(ctx context.Context, t *Task) (bool, error) {
+	if len(t.Sources) == 0 || len(t.Generates) == 0 {
+		return false, nil
+	}
+
+	dir := e.getTaskDir(t)
+
+	sourcesMaxTime, err := getPatternsMaxTime(dir, t.Sources)
+	if err != nil || sourcesMaxTime.IsZero() {
+		return false, nil
+	}
+
+	generatesMinTime, err := getPatternsMinTime(dir, t.Generates)
+	if err != nil || generatesMinTime.IsZero() {
+		return false, nil
+	}
+	return !generatesMinTime.Before(sourcesMaxTime), nil
+}
+
+func minTime(a, b time.Time) time.Time {
+	if !a.IsZero() && a.Before(b) {
+		return a
+	}
+	return b
+}
+func maxTime(a, b time.Time) time.Time {
+	if a.After(b) {
+		return a
+	}
+	return b
+}
+
+func getPatternsMinTime(dir string, patterns []string) (m time.Time, err error) {
+	for _, p := range patterns {
+		if !filepath.IsAbs(p) {
+			p = filepath.Join(dir, p)
+		}
+		mp, err := getPatternMinTime(p)
+		if err != nil {
+			return time.Time{}, err
+		}
+		m = minTime(m, mp)
+	}
+	return
+}
+func getPatternsMaxTime(dir string, patterns []string) (m time.Time, err error) {
+	for _, p := range patterns {
+		if !filepath.IsAbs(p) {
+			p = filepath.Join(dir, p)
+		}
+		mp, err := getPatternMaxTime(p)
+		if err != nil {
+			return time.Time{}, err
+		}
+		m = maxTime(m, mp)
+	}
+	return
+}
+
+func getPatternMinTime(pattern string) (minTime time.Time, err error) {
+	files, err := zglob.Glob(pattern)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	for _, f := range files {
+		info, err := os.Stat(f)
+		if err != nil {
+			return time.Time{}, err
+		}
+
+		modTime := info.ModTime()
+		if minTime.IsZero() || modTime.Before(minTime) {
+			minTime = modTime
+		}
+	}
+	return
+}
+
+func getPatternMaxTime(pattern string) (maxTime time.Time, err error) {
+	files, err := zglob.Glob(pattern)
+	if err != nil {
+		return time.Time{}, err
+	}
+
+	for _, f := range files {
+		info, err := os.Stat(f)
+		if err != nil {
+			return time.Time{}, err
+		}
+
+		modTime := info.ModTime()
+		if modTime.After(maxTime) {
+			maxTime = modTime
+		}
+	}
+	return
+}