refactor: replace failure

- failure is deprecated
- thiserror for deriving Error impl
- anyhow for highlevel error handling

examples/repl/cmdline.rs

@@ -1,6 +1,7 @@
 use std::path::Path;
 use std::str::FromStr;
 
+use anyhow::{bail, ensure};
 use deltachat::chat::{self, Chat, ChatId, ChatVisibility};
 use deltachat::chatlist::*;
 use deltachat::constants::*;
@@ -91,7 +92,7 @@ fn dc_reset_tables(context: &Context, bits: i32) -> i32 {
     1
 }
 
-fn dc_poke_eml_file(context: &Context, filename: impl AsRef<Path>) -> Result<(), Error> {
+fn dc_poke_eml_file(context: &Context, filename: impl AsRef<Path>) -> Result<(), anyhow::Error> {
     let data = dc_read_file(context, filename)?;
 
     if let Err(err) = dc_receive_imf(context, &data, "import", 0, false) {
@@ -297,7 +298,7 @@ fn chat_prefix(chat: &Chat) -> &'static str {
     chat.typ.into()
 }
 
-pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::Error> {
+pub fn dc_cmdline(context: &Context, line: &str) -> Result<(), Error> {
     let chat_id = *context.cmdline_sel_chat_id.read().unwrap();
     let mut sel_chat = if !chat_id.is_unset() {
         Chat::load_from_db(context, chat_id).ok()

examples/repl/main.rs

@@ -7,8 +7,6 @@
 #[macro_use]
 extern crate deltachat;
 #[macro_use]
-extern crate failure;
-#[macro_use]
 extern crate lazy_static;
 #[macro_use]
 extern crate rusqlite;
@@ -20,6 +18,7 @@ use std::process::Command;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex, RwLock};
 
+use anyhow::{bail, Error};
 use deltachat::chat::ChatId;
 use deltachat::config;
 use deltachat::context::*;
@@ -370,10 +369,10 @@ impl Highlighter for DcHelper {
 
 impl Helper for DcHelper {}
 
-fn main_0(args: Vec<String>) -> Result<(), failure::Error> {
+fn main_0(args: Vec<String>) -> Result<(), Error> {
     if args.len() < 2 {
         println!("Error: Bad arguments, expected [db-name].");
-        return Err(format_err!("No db-name specified"));
+        bail!("No db-name specified");
     }
     let context = Context::new(
         Box::new(receive_event),
@@ -443,7 +442,7 @@ enum ExitResult {
     Exit,
 }
 
-fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult, failure::Error> {
+fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult, Error> {
     let mut args = line.splitn(2, ' ');
     let arg0 = args.next().unwrap_or_default();
     let arg1 = args.next().unwrap_or_default();
@@ -526,7 +525,7 @@ fn handle_cmd(line: &str, ctx: Arc<RwLock<Context>>) -> Result<ExitResult, failu
     Ok(ExitResult::Continue)
 }
 
-pub fn main() -> Result<(), failure::Error> {
+pub fn main() -> Result<(), Error> {
     let _ = pretty_env_logger::try_init();
 
     let args: Vec<String> = std::env::args().collect();