Indentation is messed up when using --pager flag

[HamzaBow]

Describe the bug
Indentation is messed up when using --pager flag

Setup

• OS: WSL2 Ubuntu 24.04 - Windows 11
• Shell: fish
• Terminal Emulator: Windows Terminal
• Terminal Multiplexer: tmux
• Locale: UTF-8

To Reproduce
Steps to reproduce the behavior:
create a file that has lines that contain varying levels of indentation, e.g. a file that contains golang code. running glow ./filename.go --pager produces different indentation levels for lines that are supposed to be at the same indentation level.

Source Code
below is the content of the file I used:

package main

import (
	"fmt"
	"strconv"
)

func main() {
	// Example with an integer
	num := 42
	str := strconv.Itoa(num) // Convert integer to string
	fmt.Println("The number as a string is: \n" + str + "\n")

	// Example with a float
	floatNum := 3.14
	strFloat := strconv.FormatFloat(floatNum, 'f', -1, 64) // Convert float to string
	fmt.Println("The float as a string is: \n" + strFloat + "\n")
}

Expected behavior
Using the --pager flag should not produced inconsistent indentations, and it should just add a pager to the same content that one would have got if they didn't use the -pager flag.

Screenshots
Without --pager flag:

With --pager flag:

[prithvijj]

So when I copied over your codeblock, noticed that it would shift the indentation, when there is a comment, and then a code line right underneath it,

Example: Assuming this file lol.go and running go run . --pager lol.go

package main

import (
	"fmt"
	"strconv"
)

func main2() {
	// Example with an integer
	num := 42
	str := strconv.Itoa(num) // Convert integer to string
	fmt.Println("The number as a string is: \n" + str + "\n")

	// Example with a float
	floatNum := 3.14
	strFloat := strconv.FormatFloat(floatNum, 'f', -1, 64) // Convert float to strin
	fmt.Println("The float as a string is: \n" + strFloat + "\n")
}

func main3() {

	num := 42
	str := strconv.Itoa(num)
	fmt.Println("The number as a string is: \n" + str + "\n")

	// comments
	floatNum := 3.14
	strFloat := strconv.FormatFloat(floatNum, 'f', -1, 64)
	fmt.Println("The float as a string is: \n" + strFloat + "\n")
}

But then after making a small change to the pager itself being used, i.e. change from less -r to less -R, the formatting is fixed,

glow/main.go

Lines 301 to 308 in 7b3bfac

	if pager || cmd.Flags().Changed("pager") {
	pagerCmd := os.Getenv("PAGER")
	if pagerCmd == "" {
	pagerCmd = "less -r"
	}
	pa := strings.Split(pagerCmd, " ")
	c := exec.Command(pa[0], pa[1:]...) // nolint:gosec

---

Hence could probably create a PR that changes it from -r to -R but not sure if there are unintended consequences to it?

OS: Windows 10