parser/metadecoders: Add CSV lazyQuotes option to transform.Unmarshal

If true, a quote may appear in an unquoted field and a non-doubled quote
may appear in a quoted field. It defaults to false.

Closes #11884

docs/content/en/functions/transform/Unmarshal.md

@@ -125,6 +125,9 @@ delimiter
 comment
 : (`string`) The comment character used in the CSV. If set, lines beginning with the comment character without preceding whitespace are ignored.
 
+lazyQuotes
+: (`bool`) If true, a quote may appear in an unquoted field and a non-doubled quote may appear in a quoted field. Default is `false`.
+
 ```go-html-template
 {{ $csv := "a;b;c" | transform.Unmarshal (dict "delimiter" ";") }}
 ```

parser/metadecoders/decoder.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"log"
 	"regexp"
+	"strconv"
 	"strings"
 
 	"github.com/gohugoio/hugo/common/herrors"
@@ -41,13 +42,18 @@ type Decoder struct {
 	// Comment, if not 0, is the comment character used in the CSV decoder. Lines beginning with the
 	// Comment character without preceding whitespace are ignored.
 	Comment rune
+
+	// If true, a quote may appear in an unquoted field and a non-doubled quote
+	// may appear in a quoted field. It defaults to false.
+	LazyQuotes bool
 }
 
 // OptionsKey is used in cache keys.
 func (d Decoder) OptionsKey() string {
 	var sb strings.Builder
 	sb.WriteRune(d.Delimiter)
 	sb.WriteRune(d.Comment)
+	sb.WriteString(strconv.FormatBool(d.LazyQuotes))
 	return sb.String()
 }
 
@@ -205,6 +211,7 @@ func (d Decoder) unmarshalCSV(data []byte, v any) error {
 	r := csv.NewReader(bytes.NewReader(data))
 	r.Comma = d.Delimiter
 	r.Comment = d.Comment
+	r.LazyQuotes = d.LazyQuotes
 
 	records, err := r.ReadAll()
 	if err != nil {

tpl/transform/integration_test.go

@@ -107,3 +107,29 @@ disableKinds = ['page','rss','section','sitemap','taxonomy','term']
 	_, err := b.BuildE()
 	b.Assert(err.Error(), qt.Contains, "error calling highlight: invalid Highlight option: 0")
 }
+
+// Issue #11884
+func TestUnmarshalCSVLazyDecoding(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+disableKinds = ['page','rss','section','sitemap','taxonomy','term']
+-- assets/pets.csv --
+name,description,age
+Spot,a nice dog,3
+Rover,"a big dog",5
+Felix,a "malicious" cat,7
+Bella,"an "evil" cat",9
+Scar,"a "dead cat",11
+-- layouts/index.html --
+{{ $opts := dict "lazyQuotes" true }}
+{{ $data := resources.Get "pets.csv" | transform.Unmarshal $opts }}
+{{ printf "%v" $data | safeHTML }}
+  `
+	b := hugolib.Test(t, files)
+
+	b.AssertFileContent("public/index.html", `
+[[name description age] [Spot a nice dog 3] [Rover a big dog 5] [Felix a "malicious" cat 7] [Bella an "evil" cat 9] [Scar a "dead cat 11]]
+	`)
+}