From 865c6dc23099e129cb3ba9709b2926734144e605 Mon Sep 17 00:00:00 2001
From: tjp <tjp@ctrl-c.club>
Date: Tue, 23 Jan 2024 22:42:18 -0700
Subject: Printer abstraction

---
 state.go | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'state.go')

diff --git a/state.go b/state.go
index 57767a8..918346f 100644
--- a/state.go
+++ b/state.go
@@ -1,7 +1,11 @@
 package main
 
 import (
+	"bytes"
+	"errors"
 	"net/url"
+	"os"
+	"os/exec"
 
 	"github.com/chzyer/readline"
 )
@@ -21,6 +25,7 @@ type BrowserState struct {
 	CurrentTour *Tour
 
 	Readline *readline.Instance
+	Printer  Printer
 }
 
 type History struct {
@@ -60,3 +65,43 @@ func NewBrowserState(conf *Config) *BrowserState {
 	state.CurrentTour = &state.DefaultTour
 	return state
 }
+
+type Printer interface {
+	PrintModal(*BrowserState, []byte) error
+	PrintPage(*BrowserState, string) error
+}
+
+type PromptPrinter struct{}
+
+func (_ PromptPrinter) PrintModal(state *BrowserState, contents []byte) error {
+	_, err := os.Stdout.Write(contents)
+	return err
+}
+
+func (_ PromptPrinter) PrintPage(state *BrowserState, body string) error {
+	if state.Quiet {
+		return nil
+	}
+
+	lessarg := []string{}
+	switch state.Pager {
+	case "auto":
+		lessarg = []string{"-F"}
+		fallthrough
+	case "always":
+		less, err := exec.LookPath("less")
+		if err != nil {
+			return err
+		}
+		cmd := exec.Command(less, lessarg...)
+		cmd.Stdin = bytes.NewBufferString(body)
+		cmd.Stdout = os.Stdout
+		cmd.Stderr = os.Stderr
+		return cmd.Run()
+	case "never":
+		_, err := os.Stdout.WriteString(body)
+		return err
+	default:
+		return errors.New("invalid 'pager' value in configuration")
+	}
+}
-- 
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