Replace Clap by Structopt which seems to be nicer

Cargo.lock

@@ -40,8 +40,8 @@ name = "bekape"
 version = "0.1.0"
 dependencies = [
  "chrono",
- "clap",
  "regex",
+ "structopt",
 ]
 
 [[package]]
@@ -76,6 +76,15 @@ dependencies = [
  "vec_map",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "hermit-abi"
 version = "0.1.14"
@@ -122,6 +131,50 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc175e9777c3116627248584e8f8b3e2987405cabe1c0adf7d1dd28f09dc7880"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cc9795ca17eb581285ec44936da7fc2335a3f34f2ddd13118b6f4d515435c50"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "syn-mid",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
+dependencies = [
+ "unicode-xid",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "regex"
 version = "1.3.9"
@@ -146,6 +199,52 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 
+[[package]]
+name = "structopt"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de2f5e239ee807089b62adce73e48c625e0ed80df02c7ab3f068f5db5281065c"
+dependencies = [
+ "clap",
+ "lazy_static",
+ "structopt-derive",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "510413f9de616762a4fbeab62509bf15c729603b72d7cd71280fbca431b1c118"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8d5d96e8cbb005d6959f119f773bfaebb5684296108fb32600c00cde305b2cd"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "syn-mid"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7be3539f6c128a931cf19dcee741c1af532c7fd387baa739c03dd2e96479338a"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "textwrap"
 version = "0.11.0"
@@ -174,18 +273,36 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "unicode-segmentation"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
+
 [[package]]
 name = "unicode-width"
 version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
 
+[[package]]
+name = "unicode-xid"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
+
 [[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 = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
+
 [[package]]
 name = "winapi"
 version = "0.3.9"

Cargo.toml

@@ -6,5 +6,5 @@ edition = "2018"
 
 [dependencies]
 chrono = "0.4"
-clap = "2.33"
 regex = "1.3"
+structopt = "0.3"

src/main.rs

@@ -1,8 +1,21 @@
-use clap::{App, Arg};
 use regex::Regex;
 use std::fs;
 use std::time::SystemTime;
 use std::vec::Vec;
+use structopt::StructOpt;
+
+/// A simple backup program
+#[derive(StructOpt, Debug)]
+#[structopt(name = "Bekape")]
+struct Opt {
+    /// The folder to backup
+    #[structopt(name = "source")]
+    source: String,
+
+    /// The folder to store the backup
+    #[structopt(name = "destination")]
+    destination: String,
+}
 
 fn browse_recursively(dir: &str) -> (Vec<String>, Vec<String>) {
     let mut content = Vec::new();
@@ -64,24 +77,10 @@ fn backup_element(path: &str, src_root: &str, bkp_root: &str, prev_bkp_root: &Op
 }
 
 fn main() {
-    let matches = App::new("bekape")
+    let opt = Opt::from_args();
-        .about("Simple backup program.")
-        .arg(
-            Arg::with_name("source")
-                .help("The folder to backup")
-                .required(true),
-        )
-        .arg(
-            Arg::with_name("destination")
-                .help("The folder to store the backup")
-                .required(true),
-        )
-        .get_matches();
-    let bkp_src = matches.value_of("source").unwrap();
-    let bkp_dst = matches.value_of("destination").unwrap();
 
     let dt = chrono::offset::Utc::now().format("%Y-%m-%d_%H-%M-%S");
-    let backup_folder = format!("{}/backup_{}_wip", bkp_dst, dt);
+    let backup_folder = format!("{}/backup_{}_wip", opt.destination, dt);
     if fs::create_dir(&backup_folder).is_err() {
         eprintln!("Could not create backup directory: {}", &backup_folder);
         std::process::exit(1);
@@ -89,7 +88,7 @@ fn main() {
 
     // find previous backup
     let backup_regex = Regex::new(r"backup_\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}$").unwrap();
-    let ls = fs::read_dir(bkp_dst);
+    let ls = fs::read_dir(&opt.destination);
     let prev_backup = if let Ok(ls) = ls {
         let mut ls = ls
             .filter_map(|s| s.ok())
@@ -106,9 +105,9 @@ fn main() {
         None
     };
 
-    let result = browse_recursively(&bkp_src);
+    let result = browse_recursively(&opt.source);
     let content = result.0.iter().map(|s| {
-        let l = bkp_src.len();
+        let l = opt.source.len();
         s[l..].to_string()
     });
 
@@ -117,7 +116,7 @@ fn main() {
     }
 
     for elem in content {
-        backup_element(&elem, &bkp_src, &backup_folder, &prev_backup);
+        backup_element(&elem, &opt.source, &backup_folder, &prev_backup);
     }
 
     let new_name = backup_folder.replace("_wip", "");