Implement invocation strategy config for build scripts

Author: Veykril

crates/project-model/src/build_scripts.rs

@@ -13,8 +13,8 @@ use rustc_hash::FxHashMap;
 use serde::Deserialize;
 use serde_json::from_value;
 
-use crate::CfgOverrides;
 use crate::{utf8_stdout, ManifestPath};
+use crate::{CfgOverrides, InvocationStrategy};
 
 /// [`CargoWorkspace`] represents the logical structure of, well, a Cargo
 /// workspace. It pretty closely mirrors `cargo metadata` output.
@@ -98,6 +98,7 @@ pub struct CargoConfig {
     pub wrap_rustc_in_build_scripts: bool,
 
     pub run_build_script_command: Option<Vec<String>>,
+    pub invocation_strategy: InvocationStrategy,
 }
 
 impl CargoConfig {

crates/project-model/src/cargo_workspace.rs

@@ -157,3 +157,11 @@ fn utf8_stdout(mut cmd: Command) -> Result<String> {
     let stdout = String::from_utf8(output.stdout)?;
     Ok(stdout.trim().to_string())
 }
+
+#[derive(Clone, Debug, Default, PartialEq, Eq)]
+pub enum InvocationStrategy {
+    OnceInRoot,
+    PerWorkspaceWithManifestPath,
+    #[default]
+    PerWorkspace,
+}

crates/project-model/src/lib.rs

@@ -2,7 +2,7 @@
 //! metadata` or `rust-project.json`) into representation stored in the salsa
 //! database -- `CrateGraph`.
 
-use std::{collections::VecDeque, fmt, fs, process::Command};
+use std::{collections::VecDeque, fmt, fs, process::Command, sync::Arc};
 
 use anyhow::{format_err, Context, Result};
 use base_db::{
@@ -21,8 +21,8 @@ use crate::{
     cfg_flag::CfgFlag,
     rustc_cfg,
     sysroot::SysrootCrate,
-    utf8_stdout, CargoConfig, CargoWorkspace, ManifestPath, ProjectJson, ProjectManifest, Sysroot,
-    TargetKind, WorkspaceBuildScripts,
+    utf8_stdout, CargoConfig, CargoWorkspace, InvocationStrategy, ManifestPath, ProjectJson,
+    ProjectManifest, Sysroot, TargetKind, WorkspaceBuildScripts,
 };
 
 /// A set of cfg-overrides per crate.
@@ -273,23 +273,68 @@ impl ProjectWorkspace {
         Ok(ProjectWorkspace::DetachedFiles { files: detached_files, sysroot, rustc_cfg })
     }
 
+    /// Runs the build scripts for this [`ProjectWorkspace`].
     pub fn run_build_scripts(
         &self,
         config: &CargoConfig,
         progress: &dyn Fn(String),
     ) -> Result<WorkspaceBuildScripts> {
         match self {
             ProjectWorkspace::Cargo { cargo, toolchain, .. } => {
-                WorkspaceBuildScripts::run(config, cargo, progress, toolchain).with_context(|| {
-                    format!("Failed to run build scripts for {}", &cargo.workspace_root().display())
-                })
+                WorkspaceBuildScripts::run_for_workspace(config, cargo, progress, toolchain)
+                    .with_context(|| {
+                        format!(
+                            "Failed to run build scripts for {}",
+                            &cargo.workspace_root().display()
+                        )
+                    })
             }
             ProjectWorkspace::Json { .. } | ProjectWorkspace::DetachedFiles { .. } => {
                 Ok(WorkspaceBuildScripts::default())
             }
         }
     }
 
+    /// Runs the build scripts for the given [`ProjectWorkspace`]s. Depending on the invocation
+    /// strategy this may run a single build process for all project workspaces.
+    pub fn run_all_build_scripts(
+        workspaces: &[ProjectWorkspace],
+        config: &CargoConfig,
+        progress: &dyn Fn(String),
+    ) -> Vec<Result<WorkspaceBuildScripts>> {
+        if let InvocationStrategy::PerWorkspaceWithManifestPath | InvocationStrategy::PerWorkspace =
+            config.invocation_strategy
+        {
+            return workspaces.iter().map(|it| it.run_build_scripts(config, progress)).collect();
+        }
+
+        let cargo_ws = workspaces.iter().filter_map(|it| match it {
+            ProjectWorkspace::Cargo { cargo, .. } => Some(cargo),
+            _ => None,
+        });
+        let ref mut outputs = match WorkspaceBuildScripts::run_once(config, cargo_ws, progress) {
+            Ok(it) => Ok(it.into_iter()),
+            // io::Error is not Clone?
+            Err(e) => Err(Arc::new(e)),
+        };
+
+        workspaces
+            .iter()
+            .map(|it| match it {
+                ProjectWorkspace::Cargo { cargo, .. } => match outputs {
+                    Ok(outputs) => Ok(outputs.next().unwrap()),
+                    Err(e) => Err(e.clone()).with_context(|| {
+                        format!(
+                            "Failed to run build scripts for {}",
+                            &cargo.workspace_root().display()
+                        )
+                    }),
+                },
+                _ => Ok(WorkspaceBuildScripts::default()),
+            })
+            .collect()
+    }
+
     pub fn set_build_scripts(&mut self, bs: WorkspaceBuildScripts) {
         match self {
             ProjectWorkspace::Cargo { build_scripts, .. } => *build_scripts = bs,

crates/project-model/src/workspace.rs

@@ -68,6 +68,14 @@ config_data! {
         cargo_autoreload: bool           = "true",
         /// Run build scripts (`build.rs`) for more precise code analysis.
         cargo_buildScripts_enable: bool  = "true",
+        /// Specifies the invocation strategy to use when running the build scripts command.
+        /// If `per_workspace_with_manifest_path` is set, the command will be executed for each
+        /// workspace, `--manifest-path {workspace-dir}` will be passed to the invoked command and
+        /// the command will be executed from the project root.
+        /// If `per_workspace` is set, the command will be executed for each workspace and the
+        /// command will be executed from the corresponding workspace root.
+        /// If `once_in_root` is set, the command will be executed once in the project root.
+        cargo_buildScripts_invocationStrategy: InvocationStrategy = "\"per_workspace\"",
         /// Override the command rust-analyzer uses to run build scripts and
         /// build procedural macros. The command is required to output json
         /// and should therefore include `--message-format=json` or a similar
@@ -1024,6 +1032,13 @@ impl Config {
             rustc_source,
             unset_test_crates: UnsetTestCrates::Only(self.data.cargo_unsetTest.clone()),
             wrap_rustc_in_build_scripts: self.data.cargo_buildScripts_useRustcWrapper,
+            invocation_strategy: match self.data.cargo_buildScripts_invocationStrategy {
+                InvocationStrategy::OnceInRoot => project_model::InvocationStrategy::OnceInRoot,
+                InvocationStrategy::PerWorkspaceWithManifestPath => {
+                    project_model::InvocationStrategy::PerWorkspaceWithManifestPath
+                }
+                InvocationStrategy::PerWorkspace => project_model::InvocationStrategy::PerWorkspace,
+            },
             run_build_script_command: self.data.cargo_buildScripts_overrideCommand.clone(),
         }
     }
@@ -1549,6 +1564,14 @@ enum CargoFeatures {
     Listed(Vec<String>),
 }
 
+#[derive(Deserialize, Debug, Clone)]
+#[serde(rename_all = "snake_case")]
+enum InvocationStrategy {
+    OnceInRoot,
+    PerWorkspaceWithManifestPath,
+    PerWorkspace,
+}
+
 #[derive(Deserialize, Debug, Clone)]
 #[serde(untagged)]
 enum LifetimeElisionDef {
@@ -1963,6 +1986,15 @@ fn field_props(field: &str, ty: &str, doc: &[&str], default: &str) -> serde_json
                 "Render annotations above the whole item, including documentation comments and attributes."
             ],
         },
+        "InvocationStrategy" => set! {
+            "type": "string",
+            "enum": ["per_workspace", "per_workspace_with_manifest_path", "once_in_root"],
+            "enumDescriptions": [
+                "The command will be executed for each workspace, `--manifest-path {workspace-dir}` will be passed to the invoked command and the command will be executed from the project root.",
+                "The command will be executed for each workspace and the command will be executed from the corresponding workspace root.",
+                "The command will be executed once in the project root."
+            ],
+        },
         _ => panic!("missing entry for {}: {}", ty, default),
     }
 

crates/rust-analyzer/src/config.rs

@@ -174,10 +174,8 @@ impl GlobalState {
                     sender.send(Task::FetchBuildData(BuildDataProgress::Report(msg))).unwrap()
                 }
             };
-            let mut res = Vec::new();
-            for ws in workspaces.iter() {
-                res.push(ws.run_build_scripts(&config, &progress));
-            }
+            let res = ProjectWorkspace::run_all_build_scripts(&workspaces, &config, &progress);
+
             sender.send(Task::FetchBuildData(BuildDataProgress::End((workspaces, res)))).unwrap();
         });
     }

crates/rust-analyzer/src/reload.rs

@@ -24,6 +24,17 @@ Automatically refresh project info via `cargo metadata` on
 --
 Run build scripts (`build.rs`) for more precise code analysis.
 --
+[[rust-analyzer.cargo.buildScripts.invocationStrategy]]rust-analyzer.cargo.buildScripts.invocationStrategy (default: `"per_workspace"`)::
++
+--
+Specifies the invocation strategy to use when running the build scripts command.
+If `per_workspace_with_manifest_path` is set, the command will be executed for each
+workspace, `--manifest-path {workspace-dir}` will be passed to the invoked command and
+the command will be executed from the project root.
+If `per_workspace` is set, the command will be executed for each workspace and the
+command will be executed from the corresponding workspace root.
+If `once_in_root` is set, the command will be executed once in the project root.
+--
 [[rust-analyzer.cargo.buildScripts.overrideCommand]]rust-analyzer.cargo.buildScripts.overrideCommand (default: `null`)::
 +
 --

docs/user/generated_config.adoc

@@ -421,6 +421,21 @@
                     "default": true,
                     "type": "boolean"
                 },
+                "rust-analyzer.cargo.buildScripts.invocationStrategy": {
+                    "markdownDescription": "Specifies the invocation strategy to use when running the build scripts command.\nIf `per_workspace_with_manifest_path` is set, the command will be executed for each\nworkspace, `--manifest-path {workspace-dir}` will be passed to the invoked command and\nthe command will be executed from the project root.\nIf `per_workspace` is set, the command will be executed for each workspace and the\ncommand will be executed from the corresponding workspace root.\nIf `once_in_root` is set, the command will be executed once in the project root.",
+                    "default": "per_workspace",
+                    "type": "string",
+                    "enum": [
+                        "per_workspace",
+                        "per_workspace_with_manifest_path",
+                        "once_in_root"
+                    ],
+                    "enumDescriptions": [
+                        "The command will be executed for each workspace, `--manifest-path {workspace-dir}` will be passed to the invoked command and the command will be executed from the project root.",
+                        "The command will be executed for each workspace and the command will be executed from the corresponding workspace root.",
+                        "The command will be executed once in the project root."
+                    ]
+                },
                 "rust-analyzer.cargo.buildScripts.overrideCommand": {
                     "markdownDescription": "Override the command rust-analyzer uses to run build scripts and\nbuild procedural macros. The command is required to output json\nand should therefore include `--message-format=json` or a similar\noption.\n\nBy default, a cargo invocation will be constructed for the configured\ntargets and features, with the following base command line:\n\n```bash\ncargo check --quiet --workspace --message-format=json --all-targets\n```\n.",
                     "default": null,