Add cargo remove subcommand

src/bin/cargo/commands/mod.rs

@@ -26,6 +26,7 @@ pub fn builtin() -> Vec<App> {
         pkgid::cli(),
         publish::cli(),
         read_manifest::cli(),
+        remove::cli(),
         report::cli(),
         run::cli(),
         rustc::cli(),
@@ -68,6 +69,7 @@ pub fn builtin_exec(cmd: &str) -> Option<fn(&mut Config, &ArgMatches) -> CliResu
         "pkgid" => pkgid::exec,
         "publish" => publish::exec,
         "read-manifest" => read_manifest::exec,
+        "remove" => remove::exec,
         "report" => report::exec,
         "run" => run::exec,
         "rustc" => rustc::exec,
@@ -110,6 +112,7 @@ pub mod package;
 pub mod pkgid;
 pub mod publish;
 pub mod read_manifest;
+pub mod remove;
 pub mod report;
 pub mod run;
 pub mod rustc;

src/bin/cargo/commands/remove.rs

@@ -0,0 +1,116 @@
+use cargo::core::dependency::DepKind;
+use cargo::ops::cargo_remove::remove;
+use cargo::ops::cargo_remove::RemoveOptions;
+use cargo::ops::resolve_ws;
+use cargo::util::command_prelude::*;
+use cargo::util::toml_mut::manifest::DepTable;
+
+pub fn cli() -> clap::Command<'static> {
+    clap::Command::new("remove")
+        .setting(clap::AppSettings::DeriveDisplayOrder)
+        .about("Remove dependencies from a Cargo.toml manifest file")
+        .args([clap::Arg::new("dependencies")
+            .action(clap::ArgAction::Append)
+            .required(true)
+            .multiple_values(true)
+            .takes_value(true)
+            .value_name("DEP_ID")
+            .help("Dependencies to be removed")])
+        .arg_package("Package to remove from")
+        .arg_manifest_path()
+        .arg_quiet()
+        .arg_dry_run("Don't actually write the manifest")
+        .next_help_heading("SECTION")
+        .args([
+            clap::Arg::new("dev")
+                .long("dev")
+                .conflicts_with("build")
+                .action(clap::ArgAction::SetTrue)
+                .group("section")
+                .help("Remove as development dependency"),
+            clap::Arg::new("build")
+                .long("build")
+                .conflicts_with("dev")
+                .action(clap::ArgAction::SetTrue)
+                .group("section")
+                .help("Remove as build dependency"),
+            clap::Arg::new("target")
+                .long("target")
+                .takes_value(true)
+                .value_name("TARGET")
+                .value_parser(clap::builder::NonEmptyStringValueParser::new())
+                .help("Remove as dependency from the given target platform"),
+        ])
+}
+
+pub fn exec(config: &mut Config, args: &ArgMatches) -> CliResult {
+    let dry_run = args.dry_run();
+
+    let workspace = args.workspace(config)?;
+    let packages = args.packages_from_flags()?;
+    let packages = packages.get_packages(&workspace)?;
+    let spec = match packages.len() {
+        0 => {
+            return Err(CliError::new(
+                anyhow::format_err!("no packages selected. Please specify one with `-p <PKG_ID>`"),
+                101,
+            ));
+        }
+        1 => packages[0],
+        len => {
+            return Err(CliError::new(
+                anyhow::format_err!(
+                    "{len} packages selected. Please specify one with `-p <PKG_ID>`",
+                ),
+                101,
+            ));
+        }
+    };
+
+    let dependencies = args
+        .get_many::<String>("dependencies")
+        .expect("required(true)")
+        .cloned()
+        .collect();
+
+    let section = parse_section(args);
+
+    let options = RemoveOptions {
+        config,
+        spec,
+        dependencies,
+        section,
+        dry_run,
+    };
+    remove(&options)?;
+
+    if !dry_run {
+        // Reload the workspace since we've changed dependencies
+        let ws = args.workspace(config)?;
+        resolve_ws(&ws)?;
+    }
+
+    Ok(())
+}
+
+fn parse_section(args: &ArgMatches) -> DepTable {
+    let dev = args.flag("dev");
+    let build = args.flag("build");
+
+    let kind = if dev {
+        DepKind::Development
+    } else if build {
+        DepKind::Build
+    } else {
+        DepKind::Normal
+    };
+
+    let mut table = DepTable::new().set_kind(kind);
+
+    if let Some(target) = args.get_one::<String>("target") {
+        assert!(!target.is_empty(), "Target specification may not be empty");
+        table = table.set_target(target);
+    }
+
+    table
+}

src/cargo/ops/cargo_remove.rs

@@ -0,0 +1,65 @@
+//! Core of cargo-remove command
+
+use crate::core::Package;
+use crate::util::toml_mut::manifest::DepTable;
+use crate::util::toml_mut::manifest::LocalManifest;
+use crate::CargoResult;
+use crate::Config;
+
+/// Remove a dependency from a Cargo.toml manifest file.
+#[derive(Debug)]
+pub struct RemoveOptions<'a> {
+    /// Configuration information for Cargo operations
+    pub config: &'a Config,
+    /// Package to remove dependencies from
+    pub spec: &'a Package,
+    /// Dependencies to remove
+    pub dependencies: Vec<String>,
+    /// Which dependency section to remove these from
+    pub section: DepTable,
+    /// Whether or not to actually write the manifest
+    pub dry_run: bool,
+}
+
+/// Remove dependencies from a manifest
+pub fn remove(options: &RemoveOptions<'_>) -> CargoResult<()> {
+    let dep_table = options
+        .section
+        .to_table()
+        .into_iter()
+        .map(String::from)
+        .collect::<Vec<_>>();
+
+    let manifest_path = options.spec.manifest_path().to_path_buf();
+    let mut manifest = LocalManifest::try_new(&manifest_path)?;
+
+    for dep in &options.dependencies {
+        let section = if dep_table.len() >= 3 {
+            format!("{} for target `{}`", &dep_table[2], &dep_table[1])
+        } else {
+            dep_table[0].clone()
+        };
+        options
+            .config
+            .shell()
+            .status("Removing", format!("{dep} from {section}"))?;
+
+        manifest.remove_from_table(&dep_table, dep)?;
+
+        // Now that we have removed the crate, if that was the last reference to that
+        // crate, then we need to drop any explicitly activated features on
+        // that crate.
+        manifest.gc_dep(dep);
+    }
+
+    if options.dry_run {
+        options
+            .config
+            .shell()
+            .warn("aborting remove due to dry run")?;
+    } else {
+        manifest.write()?;
+    }
+
+    Ok(())
+}

src/cargo/ops/mod.rs

@@ -45,6 +45,7 @@ mod cargo_output_metadata;
 mod cargo_package;
 mod cargo_pkgid;
 mod cargo_read_manifest;
+pub mod cargo_remove;
 mod cargo_run;
 mod cargo_test;
 mod cargo_uninstall;

tests/testsuite/main.rs

@@ -25,6 +25,7 @@ mod cargo_command;
 mod cargo_config;
 mod cargo_env_config;
 mod cargo_features;
+mod cargo_remove;
 mod cargo_targets;
 mod cfg;
 mod check;