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For cargo_nih_plug workspace root detection

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This is a lot simpler now and it simply considers the topmost ancestor
directory of either `$CARGO_MANIFEST_DIR` or the current working
directory containing a `Cargo.toml` file.
This commit is contained in:
Robbert van der Helm 2022-11-13 18:33:15 +01:00
parent 148fc3379b
commit 08ddd9c42a
1 changed files with 22 additions and 24 deletions
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44
nih_plug_xtask/src/lib.rs
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@ -149,32 +149,30 @@ pub fn main_with_args(command_name: &str, args: impl IntoIterator<Item = String>
/// Change the current directory into the Cargo workspace's root.
///
/// This is using a heuristic to find the workspace root, walking up directories
/// from `CARGO_MANIFEST_DIR` until another `Cargo.toml` is found, and assuming
/// that is the active workspace.
/// This is using a heuristic to find the workspace root. It considers all ancestor directories of
/// either `CARGO_MANIFEST_DIR` or the current directory, and finds the leftmost one containing a
/// `Cargo.toml` file.
pub fn chdir_workspace_root() -> Result<()> {
let xtask_project_dir = std::env::var("CARGO_MANIFEST_DIR")
.context("'$CARGO_MANIFEST_DIR' was not set, are you running this binary directly?")?;
let workspace_root = Path::new(&xtask_project_dir).parent().context(
"'$CARGO_MANIFEST_DIR' has an unexpected value, are you running this binary directly?",
// This is either the directory of the xtask binary when using `nih_plug_xtask` normally, or any
// random project when using it through `cargo nih-plug`.
let project_dir = std::env::var("CARGO_MANIFEST_DIR")
.map(PathBuf::from)
.or_else(|_| std::env::current_dir())
.context(
"'$CARGO_MANIFEST_DIR' was not set and the current working directory could not be \
found",
)?;
// If `workspace_root` is not actually the workspace's root because this xtask binary's `Cargo.toml`
// file is in a sub-subdirectory, then we'll walk up the directory stack until we hopefully find
// it.
let workspace_root = if workspace_root.join("Cargo.toml").exists() {
workspace_root
} else {
let mut workspace_root_candidate = workspace_root;
loop {
workspace_root_candidate = workspace_root_candidate
.parent()
.context("Reached the file system root without finding a parent Cargo.toml file")?;
if workspace_root_candidate.join("Cargo.toml").exists() {
break workspace_root_candidate;
}
}
};
let workspace_root = project_dir
.ancestors()
.filter(|dir| dir.join("Cargo.toml").exists())
.last()
.with_context(|| {
format!(
"Could not find a 'Cargo.toml' file in '{}' or any of its parent directories",
project_dir.display()
)
})?;
std::env::set_current_dir(workspace_root)
.context("Could not change to workspace root directory")