Switch to go-toml v2

We have been using `go-toml` for language files only. This commit makes it the only TOML library.

It's spec compliant and very fast.

A benchark building a site with 200 pages with TOML front matter:

```bash
name                                  old time/op    new time/op    delta
SiteNew/Regular_TOML_front_matter-16    48.5ms ± 1%    47.1ms ± 1%  -2.85%  (p=0.029 n=4+4)

name                                  old alloc/op   new alloc/op   delta
SiteNew/Regular_TOML_front_matter-16    16.9MB ± 0%    16.7MB ± 0%  -1.56%  (p=0.029 n=4+4)

name                                  old allocs/op  new allocs/op  delta
SiteNew/Regular_TOML_front_matter-16      302k ± 0%      296k ± 0%  -2.20%  (p=0.029 n=4+4)
```

Note that the front matter unmarshaling is only a small part of building a site, so the above is very good.

Fixes #8801

1 files changed, 13 insertions, 2 deletions

diff --git a/common/herrors/line_number_extractors.go b/common/herrors/line_number_extractors.go
index 13e94614d..3df62bdfe 100644
--- a/common/herrors/line_number_extractors.go
+++ b/common/herrors/line_number_extractors.go
@@ -16,6 +16,10 @@ package herrors
 import (
 	"regexp"
 	"strconv"
+
+	"github.com/pkg/errors"
+
+	"github.com/pelletier/go-toml/v2"
 )
 
 var lineNumberExtractors = []lineNumberExtractor{
@@ -24,8 +28,7 @@ var lineNumberExtractors = []lineNumberExtractor{
 	newLineNumberErrHandlerFromRegexp(".*:(\\d+):"),
 
 	// TOML parse errors
-	newLineNumberErrHandlerFromRegexp(".*Near line (\\d+)(\\s.*)"),
-
+	tomlLineNumberExtractor,
 	// YAML parse errors
 	newLineNumberErrHandlerFromRegexp("line (\\d+):"),
 
@@ -35,6 +38,14 @@ var lineNumberExtractors = []lineNumberExtractor{
 
 type lineNumberExtractor func(e error) (int, int)
 
+var tomlLineNumberExtractor = func(e error) (int, int) {
+	e = errors.Cause(e)
+	if terr, ok := e.(*toml.DecodeError); ok {
+		return terr.Position()
+	}
+	return -1, -1
+}
+
 func newLineNumberErrHandlerFromRegexp(expression string) lineNumberExtractor {
 	re := regexp.MustCompile(expression)
 	return extractLineNo(re)