Update build dependencies and edition

Use the 2021 Rust edition. To use current version of clap changes were
adapted.

Cargo.lock

@@ -13,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.44"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61604a8f862e1d5c3229fdd78f8b02c68dcf73a4c4b05fd636d12240aaa242c1"
+checksum = "8b26702f315f53b6071259e15dd9d64528213b44d61de1ec926eca7715d62203"
 
 [[package]]
 name = "atty"
@@ -42,9 +42,9 @@ checksum = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 
 [[package]]
 name = "cc"
-version = "1.0.71"
+version = "1.0.72"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79c2681d6594606957bbb8631c4b90a7fcaaa72cdb714743a437b156d6a7eedd"
+checksum = "22a9137b95ea06864e018375b72adfb7db6e6f68cfc8df5a04d00288050485ee"
 
 [[package]]
 name = "cfg-if"
@@ -67,9 +67,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.0.0-beta.4"
+version = "3.0.0-beta.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fcd70aa5597dbc42f7217a543f9ef2768b2ef823ba29036072d30e1d88e98406"
+checksum = "feff3878564edb93745d58cf63e17b63f24142506e7a20c87a5521ed7bfb1d63"
 dependencies = [
  "atty",
  "bitflags",
@@ -80,14 +80,14 @@ dependencies = [
  "strsim",
  "termcolor",
  "textwrap",
- "vec_map",
+ "unicase",
 ]
 
 [[package]]
 name = "clap_derive"
-version = "3.0.0-beta.4"
+version = "3.0.0-beta.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b5bb0d655624a0b8770d1c178fb8ffcb1f91cc722cb08f451e3dc72465421ac"
+checksum = "8b15c6b4f786ffb6192ffe65a36855bc1fc2444bcd0945ae16748dcd6ed7d0d3"
 dependencies = [
  "heck",
  "proc-macro-error",
@@ -157,9 +157,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.103"
+version = "0.2.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8f7255a17a627354f321ef0055d63b898c6fb27eff628af4d1b66b7331edf6"
+checksum = "8521a1b57e76b1ec69af7599e75e38e7b7fad6610f037db8c79b127201b5d119"
 
 [[package]]
 name = "log"
@@ -233,9 +233,12 @@ dependencies = [
 
 [[package]]
 name = "os_str_bytes"
-version = "3.1.0"
+version = "4.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6acbef58a60fe69ab50510a55bc8cdd4d6cf2283d27ad338f54cb52747a9cf2d"
+checksum = "addaa943333a514159c80c97ff4a93306530d965d27e139188283cd13e06a799"
+dependencies = [
+ "memchr",
+]
 
 [[package]]
 name = "posixmq"
@@ -272,9 +275,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.29"
+version = "1.0.32"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9f5105d4fdaab20335ca9565e106a5d9b82b6219b5ba735731124ac6711d23d"
+checksum = "ba508cc11742c0dc5c1659771673afbab7a0efab23aa17e854cbab0837ed0b43"
 dependencies = [
  "unicode-xid",
 ]
@@ -313,9 +316,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.80"
+version = "1.0.82"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d010a1623fbd906d51d650a9916aaefc05ffa0e4053ff7fe601167f3e715d194"
+checksum = "8daf5dd0bb60cbd4137b1b587d2fc0ae729bc07cf01cd70b36a1ed5ade3b9d59"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -380,6 +383,15 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "unicase"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.8.0"
@@ -398,12 +410,6 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
 
-[[package]]
-name = "vec_map"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
-
 [[package]]
 name = "version_check"
 version = "0.9.3"

Cargo.toml

@@ -2,7 +2,7 @@
 name = "mqrs"
 version = "0.1.1"
 authors = ["finga <mqrs@onders.org>"]
-edition = "2018"
+edition = "2021"
 repository = "https://git.onders.org/finga/mqrs"
 license = "GPL-3.0-or-later"
 readme = "README.md"

src/main.rs

@@ -1,10 +1,10 @@
 use anyhow::Result;
-use clap::{crate_authors, crate_version, AppSettings, Clap};
+use clap::{crate_authors, crate_version, AppSettings, Parser};
 
 mod posix;
 mod sysv;
 
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 enum Backend {
     /// Handle POSIX message queues
     #[clap(subcommand)]
@@ -14,7 +14,7 @@ enum Backend {
     Sysv(SysvCommand),
 }
 
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 enum PosixCommand {
     Create(posix::Create),
     Info(posix::Info),
@@ -24,7 +24,7 @@ enum PosixCommand {
     Recv(posix::Recv),
 }
 
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 enum SysvCommand {
     Create(sysv::Create),
     Info(sysv::Info),
@@ -32,7 +32,7 @@ enum SysvCommand {
     Unlink(sysv::Unlink),
 }
 
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 #[clap(
     version = crate_version!(),
     author = crate_authors!(", "),

src/posix/create.rs

@@ -1,11 +1,11 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use log::{info, log_enabled, Level::Info};
 use posixmq::PosixMq;
 use std::fs;
 
 /// Create a POSIX message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Create {
     /// Permissions (octal) to create the queue with
     #[clap(short, long)]

src/posix/info.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use posixmq::PosixMq;
 
 /// Print information about an existing message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Info {
     /// Name of the queue
     #[clap(value_name = "QUEUE")]

src/posix/list.rs

@@ -1,11 +1,11 @@
 use anyhow::{anyhow, Result};
 use chrono::{DateTime, Local};
-use clap::Clap;
+use clap::Parser;
 use log::warn;
 use std::{fs, os::unix::fs::PermissionsExt};
 
 /// Print a list of existing message queues
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct List {
     /// Show all parameters
     #[clap(short, long)]

src/posix/recv.rs

@@ -1,13 +1,13 @@
 use anyhow::Result;
 use chrono::{DateTime, Local};
-use clap::Clap;
+use clap::Parser;
 use humantime::Duration;
 use log::info;
 use posixmq::PosixMq;
 use std::str;
 
 /// Receive and print a message from a message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Recv {
     /// Do not block
     #[clap(short, long)]

src/posix/send.rs

@@ -1,11 +1,11 @@
 use anyhow::Result;
 use chrono::DateTime;
-use clap::Clap;
+use clap::Parser;
 use humantime::Duration;
 use log::info;
 
 /// Send a message to a message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Send {
     /// Set a different priority, priority >= 0
     #[clap(short, long, default_value = "0")]

src/posix/unlink.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use log::info;
 
 /// Delete a message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Unlink {
     /// Name of the queue
     #[clap(value_name = "QUEUE")]

src/sysv/create.rs

@@ -1,10 +1,10 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use log::info;
 use sysvmq::SysvMq;
 
 /// Create a SysV message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Create {
     /// Permissions (octal) to create the queue with (default: 0644)
     #[clap(short, long)]

src/sysv/info.rs

@@ -1,12 +1,12 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use std::{
     fs::File,
     io::{BufRead, BufReader},
 };
 
 /// Print information about an existing message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Info {
     /// Id of the queue
     #[clap(short, long, required_unless_present_any = &["key"], conflicts_with = "key")]

src/sysv/list.rs

@@ -1,12 +1,12 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use std::{
     fs::File,
     io::{BufRead, BufReader},
 };
 
 /// Print a list of existing message queues
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct List {}
 
 impl List {

src/sysv/unlink.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
-use clap::Clap;
+use clap::Parser;
 use log::info;
 
 /// Delete a message queue
-#[derive(Clap, Debug)]
+#[derive(Debug, Parser)]
 pub struct Unlink {
     /// Id of the queue
     #[clap(