Change install to sync (with sync semantics) (#24)

For better separate at this stage (and following `pip-tools`), it's now
`puffin sync`, and it assumes `--no-deps`.

README.md

@@ -13,7 +13,7 @@ cargo run -p puffin-cli -- compile requirements.in
 To install from a resolved `requirements.txt` file:
 
 ```shell
-cargo run -p puffin-cli -- install requirements.txt
+cargo run -p puffin-cli -- sync requirements.txt
 ```
 
 ## Benchmarks

crates/puffin-cli/src/commands/compile.rs

@@ -43,7 +43,14 @@ pub(crate) async fn compile(src: &Path, cache: Option<&Path>) -> Result<ExitStat
     };
 
     // Resolve the dependencies.
-    let resolution = puffin_resolver::resolve(&requirements, markers, &tags, &client).await?;
+    let resolution = puffin_resolver::resolve(
+        &requirements,
+        markers,
+        &tags,
+        &client,
+        puffin_resolver::Flags::default(),
+    )
+    .await?;
 
     for (name, package) in resolution.iter() {
         #[allow(clippy::print_stdout)]

crates/puffin-cli/src/commands/mod.rs

@@ -1,10 +1,10 @@
 use std::process::ExitCode;
 
 pub(crate) use compile::compile;
-pub(crate) use install::install;
+pub(crate) use sync::sync;
 
 mod compile;
-mod install;
+mod sync;
 
 #[derive(Copy, Clone)]
 pub(crate) enum ExitStatus {

crates/puffin-cli/src/commands/sync.rs

@@ -11,8 +11,8 @@ use puffin_platform::Platform;
 
 use crate::commands::ExitStatus;
 
-/// Install a set of requirements into the current Python environment.
-pub(crate) async fn install(src: &Path, cache: Option<&Path>) -> Result<ExitStatus> {
+/// Install a set of locked requirements into the current Python environment.
+pub(crate) async fn sync(src: &Path, cache: Option<&Path>) -> Result<ExitStatus> {
     // Read the `requirements.txt` from disk.
     let requirements_txt = std::fs::read_to_string(src)?;
 
@@ -43,12 +43,23 @@ pub(crate) async fn install(src: &Path, cache: Option<&Path>) -> Result<ExitStat
     };
 
     // Resolve the dependencies.
-    // TODO(charlie): When installing, assume `--no-deps`.
-    let resolution = puffin_resolver::resolve(&requirements, markers, &tags, &client).await?;
+    let resolution = puffin_resolver::resolve(
+        &requirements,
+        markers,
+        &tags,
+        &client,
+        puffin_resolver::Flags::NO_DEPS,
+    )
+    .await?;
 
     // Install into the current environment.
     let wheels = resolution.into_files().collect::<Vec<_>>();
     puffin_installer::install(&wheels, &python, &client).await?;
 
+    #[allow(clippy::print_stdout)]
+    {
+        println!("Installed {} wheels", wheels.len());
+    }
+
     Ok(ExitStatus::Success)
 }

crates/puffin-cli/src/main.rs

@@ -22,8 +22,8 @@ struct Cli {
 enum Commands {
     /// Compile a `requirements.in` file to a `requirements.txt` file.
     Compile(CompileArgs),
-    /// Install dependencies from a `requirements.txt` file.
-    Install(InstallArgs),
+    /// Sync dependencies from a `requirements.txt` file.
+    Sync(SyncArgs),
 }
 
 #[derive(Args)]
@@ -37,7 +37,7 @@ struct CompileArgs {
 }
 
 #[derive(Args)]
-struct InstallArgs {
+struct SyncArgs {
     /// Path to the `requirements.txt` file to install.
     src: PathBuf,
 
@@ -59,16 +59,16 @@ async fn main() -> ExitCode {
             commands::compile(
                 &args.src,
                 dirs.as_ref()
-                    .map(directories::ProjectDirs::cache_dir)
+                    .map(ProjectDirs::cache_dir)
                     .filter(|_| !args.no_cache),
             )
             .await
         }
-        Commands::Install(args) => {
-            commands::install(
+        Commands::Sync(args) => {
+            commands::sync(
                 &args.src,
                 dirs.as_ref()
-                    .map(directories::ProjectDirs::cache_dir)
+                    .map(ProjectDirs::cache_dir)
                     .filter(|_| !args.no_cache),
             )
             .await

crates/puffin-resolver/Cargo.toml

@@ -19,3 +19,4 @@ futures = "0.3.28"
 anyhow = "1.0.75"
 tracing = "0.1.37"
 pep508_rs = "0.2.3"
+bitflags = "2.4.0"

crates/puffin-resolver/src/lib.rs

@@ -2,6 +2,7 @@ use std::collections::{HashMap, HashSet};
 use std::str::FromStr;
 
 use anyhow::Result;
+use bitflags::bitflags;
 use futures::future::Either;
 use futures::{StreamExt, TryFutureExt};
 use pep440_rs::Version;
@@ -42,12 +43,21 @@ impl PinnedPackage {
     }
 }
 
+bitflags! {
+    #[derive(Debug, Copy, Clone, Default)]
+    pub struct Flags: u8 {
+        /// Don't install package dependencies.
+        const NO_DEPS = 1 << 0;
+    }
+}
+
 /// Resolve a set of requirements into a set of pinned versions.
 pub async fn resolve(
     requirements: &Requirements,
     markers: &MarkerEnvironment,
     tags: &Tags,
     client: &PypiClient,
+    flags: Flags,
 ) -> Result<Resolution> {
     // A channel to fetch package metadata (e.g., given `flask`, fetch all versions) and version
     // metadata (e.g., given `flask==1.0.0`, fetch the metadata for that version).
@@ -141,6 +151,7 @@ pub async fn resolve(
                         },
                     );
 
+                    if !flags.intersects(Flags::NO_DEPS) {
                         // Enqueue its dependencies.
                         for dependency in metadata.requires_dist {
                             if !dependency.evaluate_markers(
@@ -166,6 +177,7 @@ pub async fn resolve(
 
                             package_sink.unbounded_send(Request::Package(dependency))?;
                         }
+                    };
                 }
             }
         }