Replace deprecated ioutil with io and os

https://pkg.go.dev/io/ioutil is deprecated since Go 1.16.

common/herrors/error_locator.go

@@ -16,7 +16,6 @@ package herrors
 
 import (
 	"io"
-	"io/ioutil"
 	"path/filepath"
 	"strings"
 
@@ -114,7 +113,7 @@ func locateError(r io.Reader, le FileError, matches LineMatcherFn) *ErrorContext
 
 	ectx := &ErrorContext{LinesPos: -1, Position: text.Position{Offset: -1}}
 
-	b, err := ioutil.ReadAll(r)
+	b, err := io.ReadAll(r)
 	if err != nil {
 		return ectx
 	}

common/hugio/writers.go

@@ -15,7 +15,6 @@ package hugio
 
 import (
 	"io"
-	"io/ioutil"
 )
 
 // As implemented by strings.Builder.
@@ -63,7 +62,7 @@ func ToWriteCloser(w io.Writer) io.WriteCloser {
 		io.Closer
 	}{
 		w,
-		ioutil.NopCloser(nil),
+		io.NopCloser(nil),
 	}
 }
 
@@ -79,6 +78,6 @@ func ToReadCloser(r io.Reader) io.ReadCloser {
 		io.Closer
 	}{
 		r,
-		ioutil.NopCloser(nil),
+		io.NopCloser(nil),
 	}
 }

common/loggers/loggers.go

@@ -17,7 +17,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"log"
 	"os"
 	"regexp"
@@ -92,7 +91,7 @@ type logger struct {
 	*jww.Notepad
 
 	// The writer that represents stdout.
-	// Will be ioutil.Discard when in quiet mode.
+	// Will be io.Discard when in quiet mode.
 	out io.Writer
 
 	logCounters *LogCounters
@@ -232,12 +231,12 @@ func NewErrorLogger() Logger {
 
 // NewBasicLogger creates a new basic logger writing to Stdout.
 func NewBasicLogger(t jww.Threshold) Logger {
-	return newLogger(t, jww.LevelError, os.Stdout, ioutil.Discard, false)
+	return newLogger(t, jww.LevelError, os.Stdout, io.Discard, false)
 }
 
 // NewBasicLoggerForWriter creates a new basic logger writing to w.
 func NewBasicLoggerForWriter(t jww.Threshold, w io.Writer) Logger {
-	return newLogger(t, jww.LevelError, w, ioutil.Discard, false)
+	return newLogger(t, jww.LevelError, w, io.Discard, false)
 }
 
 // RemoveANSIColours removes all ANSI colours from the given string.
@@ -291,7 +290,7 @@ func InitGlobalLogger(stdoutThreshold, logThreshold jww.Threshold, outHandle, lo
 
 func getLogWriters(outHandle, logHandle io.Writer) (io.Writer, io.Writer) {
 	isTerm := terminal.PrintANSIColors(os.Stdout)
-	if logHandle != ioutil.Discard && isTerm {
+	if logHandle != io.Discard && isTerm {
 		// Remove any Ansi coloring from log output
 		logHandle = ansiCleaner{w: logHandle}
 	}