Add pager support

actions.go

@@ -311,7 +311,11 @@ func ActionViewDescription(_ []string) {
 		printError("Failed to get issue", err)
 		return
 	}
-	println(issue.Fields.Description)
+	err = ShowPaged(issue.Fields.Description)
+	if err != nil {
+		printError("Failed to show description", err)
+		return
+	}
 }
 
 func ActionViewComments(_ []string) {
@@ -327,12 +331,18 @@ func ActionViewComments(_ []string) {
 	if len(issue.Fields.Comments.Comments) == 0 {
 		println("This issue has no comments")
 	}
+	content := ""
 	for i, comment := range issue.Fields.Comments.Comments {
 		if i != 0 {
 			println()
 		}
-		fmt.Printf("%s at %s:\n", red(comment.Author.DisplayName), blue(comment.Created))
+		content += fmt.Sprintf("%s at %s:\n", red(comment.Author.DisplayName), blue(comment.Created))
-		fmt.Printf("  %s\n", comment.Body)
+		content += fmt.Sprintf("  %s\n", comment.Body)
+	}
+	err = ShowPaged(content)
+	if err != nil {
+		printError("Failed to show comments", err)
+		return
 	}
 }
 

pager.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func GetPager() (string, []string) {
+	pager, hasPager := os.LookupEnv("PAGER")
+	if hasPager {
+		return pager, nil
+	}
+	return "less", []string{"--RAW-CONTROL-CHARS"}
+}
+
+func ShowPaged(content string) error {
+	pager, args := GetPager()
+	cmd := exec.Command(pager, args...)
+	cmd.Stdin = strings.NewReader(content)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return cmd.Run()
+}