snapshot of https://github.com/sqlc-dev/sqlc.git (main, 2026-09-16; blobs > 131072B omitted)

internal/cmd/diff.go

@@ -0,0 +1,59 @@
+package cmd
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"runtime/trace"
+	"sort"
+	"strings"
+
+	"github.com/cubicdaiya/gonp"
+)
+
+func Diff(ctx context.Context, dir, name string, opts *Options) error {
+	stderr := opts.Stderr
+	output, err := Generate(ctx, dir, name, opts)
+	if err != nil {
+		return err
+	}
+	defer trace.StartRegion(ctx, "checkfiles").End()
+	var errored bool
+
+	keys := make([]string, 0, len(output))
+	for k, _ := range output {
+		kk := k
+		keys = append(keys, kk)
+	}
+	sort.Strings(keys)
+
+	for _, filename := range keys {
+		source := output[filename]
+		if _, err := os.Stat(filename); errors.Is(err, os.ErrNotExist) {
+			errored = true
+			// stdout message
+			continue
+		}
+		existing, err := os.ReadFile(filename)
+		if err != nil {
+			errored = true
+			fmt.Fprintf(stderr, "%s: %s\n", filename, err)
+			continue
+		}
+		diff := gonp.New(getLines(existing), getLines([]byte(source)))
+		diff.Compose()
+		uniHunks := filterHunks(diff.UnifiedHunks())
+
+		if len(uniHunks) > 0 {
+			errored = true
+			fmt.Fprintf(stderr, "--- a%s\n", strings.TrimPrefix(filename, dir))
+			fmt.Fprintf(stderr, "+++ b%s\n", strings.TrimPrefix(filename, dir))
+			diff.FprintUniHunks(stderr, uniHunks)
+		}
+	}
+	if errored {
+		return errors.New("diff found")
+	}
+	return nil
+}