feat: add cli

Cargo.toml

@@ -14,4 +14,5 @@ readme = "README.md"
 walkdir = "2.5.0"
 cargo_metadata = "0.18.1"
 cargo_toml = "0.19.2"
+bpaf = { version = "0.9.9", features = ["derive"] }
 syn = { version = "2", features = ["full", "visit"] }

README.md

@@ -16,10 +16,14 @@ Detect and remove unused dependencies from `Cargo.toml` in Rust projects.
   * can we run some other command and get the macro expanded source to parse?
   * is there an API for getting imports instead of parsing?
 
-## Improvements
-
-* add a CLI, preferably [bpaf](https://docs.rs/bpaf/latest/bpaf/index.html)
-* make the reporting more granular for `[dependencies]`, `[dev-dependencies]` and `[build-dependencies]`
+## TODO
+
+- [ ] make the reporting more granular for `[dependencies]`, `[dev-dependencies]` and `[build-dependencies]`
+- [ ] `--fix`
+- [ ] add tests
+- [ ] exit codes
+- [ ] error recovery
+- [ ] print things more nicely
 
 ## Prior Arts
 

justfile

@@ -18,3 +18,6 @@ run-release command:
 fmt:
   cargo fmt
   taplo format
+
+lint:
+  cargo clippy

src/lib.rs

@@ -1,18 +1,24 @@
 use std::{
     collections::HashSet,
-    env, fs,
+    fs,
     path::{Path, PathBuf},
 };
 
+use bpaf::Bpaf;
 use cargo_metadata::{Metadata, MetadataCommand, Package};
 use walkdir::WalkDir;
 
 type Deps = HashSet<String>;
 
-pub fn shear() {
-    let current_dir = env::args().nth(1).map_or_else(|| PathBuf::from("."), PathBuf::from);
+#[derive(Debug, Clone, Bpaf)]
+#[bpaf(options)]
+pub struct Options {
+    #[bpaf(positional("PATH"), fallback(PathBuf::from(".")))]
+    path: PathBuf,
+}
 
-    let metadata = MetadataCommand::new().current_dir(&current_dir).exec().unwrap();
+pub fn shear(options: &Options) {
+    let metadata = MetadataCommand::new().current_dir(&options.path).exec().unwrap();
     let workspace_root = metadata.workspace_root.as_std_path();
 
     for package in metadata.workspace_packages() {

src/main.rs

@@ -1,5 +1,8 @@
 use cargo_shear::shear;
 
+use cargo_shear::options;
+
 fn main() {
-    shear();
+    let options = options().fallback_to_usage().run();
+    shear(&options);
 }