From 2e955d89d9ce0d1a08d5da0f670f9e8254b73fa4 Mon Sep 17 00:00:00 2001
From: Francesc Campoy <francesc@campoy.cat>
Date: Wed, 11 Feb 2026 17:21:29 -0800
Subject: [PATCH] Replace deprecated io/ioutil with io and os equivalents

io/ioutil has been deprecated since Go 1.16. This migrates all
usages to their modern replacements:
- ioutil.ReadAll -> io.ReadAll
- ioutil.ReadFile -> os.ReadFile
- ioutil.NopCloser -> io.NopCloser

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 embedmd/content.go  | 7 ++++---
 integration_test.go | 4 ++--
 main.go             | 3 +--
 main_test.go        | 3 +--
 4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/embedmd/content.go b/embedmd/content.go
index b9001af..be23501 100644
--- a/embedmd/content.go
+++ b/embedmd/content.go
@@ -15,8 +15,9 @@ package embedmd
 
 import (
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
 )
@@ -36,7 +37,7 @@ type fetcher struct{}
 func (fetcher) Fetch(dir, path string) ([]byte, error) {
 	if !strings.HasPrefix(path, "http://") && !strings.HasPrefix(path, "https://") {
 		path = filepath.Join(dir, filepath.FromSlash(path))
-		return ioutil.ReadFile(path)
+		return os.ReadFile(path)
 	}
 
 	res, err := http.Get(path)
@@ -47,5 +48,5 @@ func (fetcher) Fetch(dir, path string) ([]byte, error) {
 	if res.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("status %s", res.Status)
 	}
-	return ioutil.ReadAll(res.Body)
+	return io.ReadAll(res.Body)
 }
diff --git a/integration_test.go b/integration_test.go
index f6e4ace..352c328 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -1,7 +1,7 @@
 package main
 
 import (
-	"io/ioutil"
+	"os"
 	"os/exec"
 	"path/filepath"
 	"testing"
@@ -14,7 +14,7 @@ func TestIntegration(t *testing.T) {
 	if err != nil {
 		t.Fatalf("could not process file (%v): %s", err, got)
 	}
-	wants, err := ioutil.ReadFile(filepath.Join("sample", "result.md"))
+	wants, err := os.ReadFile(filepath.Join("sample", "result.md"))
 	if err != nil {
 		t.Fatalf("could not read result: %v", err)
 	}
diff --git a/main.go b/main.go
index bdbe8d4..018bcf4 100644
--- a/main.go
+++ b/main.go
@@ -37,7 +37,6 @@ import (
 	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -132,7 +131,7 @@ func readFile(path string) ([]byte, error) {
 		return nil, err
 	}
 	defer f.Close()
-	return ioutil.ReadAll(f)
+	return io.ReadAll(f)
 }
 
 func processFile(path string, rewrite, doDiff bool) (foundDiff bool, err error) {
diff --git a/main_test.go b/main_test.go
index 17ba4f1..904bcf5 100644
--- a/main_test.go
+++ b/main_test.go
@@ -16,7 +16,6 @@ package main
 import (
 	"bytes"
 	"io"
-	"io/ioutil"
 	"os"
 	"strings"
 	"testing"
@@ -146,7 +145,7 @@ func (f *fakeFile) WriteAt(b []byte, offset int64) (int, error) { return f.buf.W
 func (f *fakeFile) Truncate(int64) error                        { return nil }
 
 func newFakeFile(s string) *fakeFile {
-	return &fakeFile{ReadCloser: ioutil.NopCloser(strings.NewReader(s))}
+	return &fakeFile{ReadCloser: io.NopCloser(strings.NewReader(s))}
 }
 
 func newOpenFunc(files map[string]string) func(string) (file, error) {