feat(cli): allow tasks to require modules to be selected

Cargo.toml

@@ -45,6 +45,7 @@ tinytemplate = "1.2.1"
 serde_json = { version = "1.0.133", features = ["indexmap"] }
 git-cache = "0.2.3"
 shellexpand = "3.1.0"
+thiserror = "2.0.6"
 
 [profile.release]
 lto = "fat"

src/data.rs

@@ -228,6 +228,7 @@ pub struct YamlTask {
     pub cmd: Vec<String>,
     pub help: Option<String>,
     pub required_vars: Option<Vec<String>>,
+    pub required_modules: Option<Vec<String>>,
     pub export: Option<Vec<StringOrMapString>>,
     #[serde(default = "default_as_true")]
     pub build: bool,
@@ -243,6 +244,7 @@ impl From<YamlTask> for Task {
             cmd: yaml_task.cmd,
             help: yaml_task.help,
             required_vars: yaml_task.required_vars,
+            required_modules: yaml_task.required_modules,
             export: yaml_task
                 .export
                 .map(|s| s.iter().map(|s| s.clone().into()).collect_vec()),

src/generate.rs

@@ -27,14 +27,14 @@ use super::{
     nested_env,
     nested_env::{Env, EnvKey, IfMissing},
     ninja::{NinjaBuildBuilder, NinjaRule, NinjaRuleBuilder},
-    utils, Context, ContextBag, Dependency, Module, Task,
+    utils, Context, ContextBag, Dependency, Module, Task, TaskError,
 };
 
 #[derive(Deserialize, Serialize, Debug)]
 pub struct BuildInfo {
     pub binary: String,
     pub builder: String,
-    pub tasks: IndexMap<String, Task>,
+    pub tasks: IndexMap<String, Result<Task, TaskError>>,
     pub out: Utf8PathBuf,
 
     #[serde(skip)]
@@ -972,7 +972,7 @@ fn configure_build(
     global_env_flattened.insert(&out_str, outfile.to_string());
     let tasks = build
         .build_context
-        .collect_tasks(contexts, &global_env_flattened)?;
+        .collect_tasks(contexts, &global_env_flattened, &modules)?;
 
     Ok(ConfigureBuildResult::Build(
         BuildInfo {

src/main.rs

@@ -45,7 +45,7 @@ mod serde_bool_helpers;
 mod task_runner;
 mod utils;
 
-use model::{Context, ContextBag, Dependency, Module, Rule, Task};
+use model::{Context, ContextBag, Dependency, Module, Rule, Task, TaskError};
 
 use generate::{get_ninja_build_file, BuildInfo, GenerateMode, GeneratorBuilder, Selector};
 use nested_env::{Env, MergeOption};
@@ -358,7 +358,30 @@ fn try_main() -> Result<i32> {
                     })
                     .collect();
 
-                if builds.is_empty() {
+                if !builds
+                    .iter()
+                    .any(|build_info| build_info.tasks.iter().any(|t| t.1.is_ok() && t.0 == task))
+                {
+                    let mut not_available = 0;
+                    for b in builds {
+                        for t in &b.tasks {
+                            if t.1.is_err() && t.0 == task {
+                                not_available += 1;
+                                if verbose > 0 {
+                                    eprintln!(
+                                    "laze: warn: task \"{task}\" for binary \"{}\" on builder \"{}\": {}",
+                                    b.binary,
+                                    b.builder,
+                                    t.1.as_ref().err().unwrap()
+                                );
+                                }
+                            }
+                        }
+                    }
+
+                    if not_available > 0 && verbose == 0 {
+                        println!("laze hint: {not_available} target(s) not available, try `--verbose` to list why");
+                    }
                     return Err(anyhow!("no matching target for task \"{}\" found.", task));
                 }
 
@@ -382,11 +405,13 @@ fn try_main() -> Result<i32> {
 
                 for build in builds {
                     let task = build.tasks.get(task).unwrap();
-                    if task.build_app() {
-                        let build_target = build.out.clone();
-                        ninja_targets.push(build_target);
+                    if let Ok(task) = task {
+                        if task.build_app() {
+                            let build_target = build.out.clone();
+                            ninja_targets.push(build_target);
+                        }
+                        targets.push((build, task));
                     }
-                    targets.push((build, task));
                 }
 
                 if !ninja_targets.is_empty() && !build_matches.get_flag("generate-only") {

src/model/context.rs

@@ -7,7 +7,7 @@ use camino::Utf8PathBuf;
 
 use crate::Env;
 use crate::MergeOption;
-use crate::{ContextBag, Module, Rule, Task};
+use crate::{ContextBag, Module, Rule, Task, TaskError};
 
 #[derive(Eq)]
 pub struct Context {
@@ -149,22 +149,43 @@ impl Context {
         &self,
         contexts: &ContextBag,
         env: &im::HashMap<&String, String>,
-    ) -> Result<IndexMap<String, Task>, Error> {
+        modules: &IndexMap<&String, (&Module, Env, std::option::Option<IndexSet<&Module>>)>,
+    ) -> Result<IndexMap<String, Result<Task, TaskError>>, Error> {
         let mut result = IndexMap::new();
         let mut parents = Vec::new();
         self.get_parents(contexts, &mut parents);
         for parent in parents {
             if let Some(tasks) = &parent.tasks {
-                for (name, task) in tasks {
+                'tasks: for (name, task) in tasks {
                     if let Some(required_vars) = &task.required_vars {
-                        if required_vars.iter().any(|x| !env.contains_key(x)) {
-                            continue;
+                        for var in required_vars {
+                            if !env.contains_key(var) {
+                                result.insert(
+                                    name.clone(),
+                                    Err(TaskError::RequiredVarMissing { var: var.clone() }),
+                                );
+                                continue 'tasks;
+                            }
+                        }
+                    }
+                    if let Some(required_modules) = &task.required_modules {
+                        for module in required_modules {
+                            if !modules.contains_key(module) {
+                                result.insert(
+                                    name.clone(),
+                                    Err(TaskError::RequiredModuleMissing {
+                                        module: module.clone(),
+                                    }),
+                                );
+                                continue 'tasks;
+                            }
                         }
                     }
                     result.insert(
                         name.clone(),
-                        task.with_env_eval(env)
-                            .with_context(|| format!("task \"{}\"", name))?,
+                        Ok(task
+                            .with_env_eval(env)
+                            .with_context(|| format!("task \"{}\"", name))?),
                     );
                 }
             }

src/model/mod.rs

@@ -12,5 +12,4 @@ pub use context_bag::{ContextBag, IsAncestor};
 pub use dependency::Dependency;
 pub use module::{CustomBuild, Module};
 pub use rule::Rule;
-pub use task::Task;
-pub use task::VarExportSpec;
+pub use task::{Task, TaskError, VarExportSpec};

src/model/task.rs

@@ -1,24 +1,34 @@
 use std::path::Path;
 
 use anyhow::{Error, Result};
+use thiserror::Error;
 
 use crate::nested_env;
 use crate::serde_bool_helpers::{default_as_false, default_as_true};
 use crate::IGNORE_SIGINT;
 
-#[derive(Debug, Serialize, Deserialize, Eq, PartialEq)]
+#[derive(Debug, Serialize, Deserialize, Eq, PartialEq, Clone)]
 #[serde(deny_unknown_fields)]
 pub struct Task {
     pub cmd: Vec<String>,
     pub help: Option<String>,
     pub required_vars: Option<Vec<String>>,
+    pub required_modules: Option<Vec<String>>,
     pub export: Option<Vec<VarExportSpec>>,
     #[serde(default = "default_as_true")]
     pub build: bool,
     #[serde(default = "default_as_false")]
     pub ignore_ctrl_c: bool,
 }
 
+#[derive(Error, Debug, Serialize, Deserialize)]
+pub enum TaskError {
+    #[error("required variable `{var}` not set")]
+    RequiredVarMissing { var: String },
+    #[error("required module `{module}` not selected")]
+    RequiredModuleMissing { module: String },
+}
+
 #[derive(Debug, Serialize, Deserialize, Eq, PartialEq, Clone)]
 pub struct VarExportSpec {
     pub variable: String,
@@ -101,8 +111,6 @@ impl Task {
 
     fn _with_env(&self, env: &im::HashMap<&String, String>, do_eval: bool) -> Result<Task, Error> {
         Ok(Task {
-            help: self.help.clone(),
-            build: self.build,
             cmd: self
                 .cmd
                 .iter()
@@ -114,13 +122,12 @@ impl Task {
                     }
                 })
                 .collect::<Result<Vec<String>, _>>()?,
-            ignore_ctrl_c: self.ignore_ctrl_c,
-            required_vars: self.required_vars.clone(),
             export: if do_eval {
                 self.expand_export(env)
             } else {
                 self.export.clone()
             },
+            ..(*self).clone()
         })
     }