feat(deltachat-repl): built-in QR code printer

Print QR codes with Rust code
instead of depending on external `qrencode`.

deltachat-repl/Cargo.toml

@@ -11,6 +11,7 @@ deltachat = { workspace = true, features = ["internals"]}
 dirs = "5"
 log = { workspace = true }
 nu-ansi-term = { workspace = true }
+qr2term = "0.3.3"
 rusqlite = { workspace = true }
 rustyline = "14"
 tokio = { workspace = true, features = ["fs", "rt-multi-thread", "macros"] }

deltachat-repl/src/cmdline.rs

@@ -1,9 +1,7 @@
 #![allow(clippy::format_push_string)]
 extern crate dirs;
 
-use std::io::Write;
 use std::path::Path;
-use std::process::Command;
 use std::str::FromStr;
 use std::time::Duration;
 
@@ -491,12 +489,7 @@ pub async fn cmdline(context: Context, line: &str, chat_id: &mut ChatId) -> Resu
             let provider = BackupProvider::prepare(&context).await?;
             let qr = format_backup(&provider.qr())?;
             println!("QR code: {}", qr);
-            let output = Command::new("qrencode")
-                .args(["-t", "ansiutf8", qr.as_str(), "-o", "-"])
-                .output()
-                .expect("failed to execute process");
-            std::io::stdout().write_all(&output.stdout).unwrap();
-            std::io::stderr().write_all(&output.stderr).unwrap();
+            qr2term::print_qr(qr.as_str())?;
             provider.await?;
         }
         "receive-backup" => {

deltachat-repl/src/main.rs

@@ -9,8 +9,6 @@
 extern crate deltachat;
 
 use std::borrow::Cow::{self, Borrowed, Owned};
-use std::io::{self, Write};
-use std::process::Command;
 
 use anyhow::{bail, Error};
 use deltachat::chat::ChatId;
@@ -450,12 +448,7 @@ async fn handle_cmd(
                     qr.replace_range(12..22, "0000000000")
                 }
                 println!("{qr}");
-                let output = Command::new("qrencode")
-                    .args(["-t", "ansiutf8", qr.as_str(), "-o", "-"])
-                    .output()
-                    .expect("failed to execute process");
-                io::stdout().write_all(&output.stdout).unwrap();
-                io::stderr().write_all(&output.stderr).unwrap();
+                qr2term::print_qr(qr.as_str())?;
             }
         }
         "getqrsvg" => {