Drop clap for pico-args

We barely have any flags so it's not worth the compilation time or
binary size to use clap.

Cargo.lock

@@ -77,21 +77,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "clap"
-version = "3.0.0-beta.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4bd1061998a501ee7d4b6d449020df3266ca3124b941ec56cf2005c3779ca142"
-dependencies = [
- "bitflags",
- "indexmap",
- "lazy_static",
- "os_str_bytes",
- "textwrap",
- "unicode-width",
- "vec_map",
-]
-
 [[package]]
 name = "crossbeam-utils"
 version = "0.8.4"
@@ -272,17 +257,10 @@ dependencies = [
  "regex",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.9.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7afe4a420e3fe79967a00898cc1f4db7c8a49a9333a29f8a4bd76a253d5cd04"
-
 [[package]]
 name = "helix-core"
 version = "0.1.0"
 dependencies = [
- "anyhow",
  "etcetera",
  "helix-syntax",
  "once_cell",
@@ -335,7 +313,6 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "chrono",
- "clap",
  "crossterm",
  "dirs-next",
  "fern",
@@ -349,6 +326,7 @@ dependencies = [
  "log",
  "num_cpus",
  "once_cell",
+ "pico-args",
  "pulldown-cmark",
  "serde",
  "serde_json",
@@ -423,16 +401,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "indexmap"
-version = "1.6.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "824845a0bf897a9042383849b02c1bc219c2383772efcd5c6f9766fa4b81aef3"
-dependencies = [
- "autocfg",
- "hashbrown",
-]
-
 [[package]]
 name = "instant"
 version = "0.1.9"
@@ -602,12 +570,6 @@ version = "1.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "af8b08b04175473088b46763e51ee54da5f9a164bc162f615b91bc179dbf15a3"
 
-[[package]]
-name = "os_str_bytes"
-version = "2.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "afb2e1c3ee07430c2cf76151675e583e0f19985fa6efae47d6848a3e2c824f85"
-
 [[package]]
 name = "parking_lot"
 version = "0.11.1"
@@ -645,6 +607,12 @@ version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
+[[package]]
+name = "pico-args"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7d7afeb98c5a10e0bffcc7fc16e105b04d06729fac5fd6384aebf7ff5cb5a67d"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.6"
@@ -857,15 +825,6 @@ dependencies = [
  "utf-8",
 ]
 
-[[package]]
-name = "textwrap"
-version = "0.12.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "203008d98caf094106cfaba70acfed15e18ed3ddb7d94e49baec153a2b462789"
-dependencies = [
- "unicode-width",
-]
-
 [[package]]
 name = "thiserror"
 version = "1.0.25"
@@ -1044,12 +1003,6 @@ version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
-[[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"

helix-core/Cargo.toml

@@ -11,7 +11,6 @@ license = "MPL-2.0"
 helix-syntax = { path = "../helix-syntax" }
 
 ropey = "1.2"
-anyhow = "1"
 smallvec = "1.4"
 tendril = "0.4.2"
 unicode-segmentation = "1.6"

helix-term/Cargo.toml

@@ -24,7 +24,7 @@ tokio = { version = "1", features = ["full"] }
 num_cpus = "1"
 tui = { path = "../helix-tui", package = "helix-tui", default-features = false, features = ["crossterm"] }
 crossterm = { version = "0.19", features = ["event-stream"] }
-clap = { version = "3.0.0-beta.2 ", default-features = false, features = ["std", "cargo"] }
+pico-args = "0.4"
 
 futures-util = { version = "0.3", features = ["std", "async-await"], default-features = false }
 

helix-term/src/application.rs

@@ -1,8 +1,6 @@
-use clap::ArgMatches as Args;
-
 use helix_view::{document::Mode, Document, Editor, Theme, View};
 
-use crate::{compositor::Compositor, ui};
+use crate::{compositor::Compositor, ui, Args};
 
 use log::{error, info};
 
@@ -47,8 +45,8 @@ impl Application {
         let size = compositor.size();
         let mut editor = Editor::new(size);
 
-        if let Ok(files) = args.values_of_t::<PathBuf>("files") {
-            for file in files {
+        if !args.files.is_empty() {
+            for file in args.files {
                 editor.open(file, Action::VerticalSplit)?;
             }
         } else {

helix-term/src/main.rs

@@ -8,7 +8,6 @@ mod ui;
 
 use application::Application;
 
-use clap::{App, Arg};
 use std::path::PathBuf;
 
 use anyhow::Error;
@@ -48,25 +47,48 @@ fn setup_logging(verbosity: u64) -> Result<(), fern::InitError> {
     Ok(())
 }
 
+pub struct Args {
+    files: Vec<PathBuf>,
+}
+
 fn main() {
-    let args = clap::app_from_crate!()
-        .arg(
-            Arg::new("files")
-                .about("Sets the input file to use")
-                .required(false)
-                .multiple(true)
-                .index(1),
-        )
-        .arg(
-            Arg::new("verbose")
-                .about("Increases logging verbosity each use for up to 3 times")
-                .short('v')
-                .takes_value(false)
-                .multiple_occurrences(true),
-        )
-        .get_matches();
-
-    let verbosity: u64 = args.occurrences_of("verbose");
+    let help = format!(
+        "\
+{} {}
+{}
+{}
+
+USAGE:
+    hx [FLAGS] [files]...
+
+ARGS:
+    <files>...    Sets the input file to use
+
+FLAGS:
+    -h, --help       Prints help information
+    -v               Increases logging verbosity each use for up to 3 times
+    -V, --version    Prints version information
+",
+        env!("CARGO_PKG_NAME"),
+        env!("CARGO_PKG_VERSION"),
+        env!("CARGO_PKG_AUTHORS"),
+        env!("CARGO_PKG_DESCRIPTION"),
+    );
+
+    let mut pargs = pico_args::Arguments::from_env();
+
+    // Help has a higher priority and should be handled separately.
+    if pargs.contains(["-h", "--help"]) {
+        print!("{}", help);
+        std::process::exit(0);
+    }
+
+    let args = Args {
+        files: pargs.finish().into_iter().map(|arg| arg.into()).collect(),
+    };
+
+    // let verbosity: u64 = args.occurrences_of("verbose");
+    let verbosity: u64 = 0;
 
     setup_logging(verbosity).expect("failed to initialize logging.");