hakari/cli_ops/initialize.rs
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// Copyright (c) The cargo-guppy Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
use crate::cli_ops::workspace_ops::{WorkspaceOp, WorkspaceOps};
use camino::{Utf8Path, Utf8PathBuf};
use guppy::graph::PackageGraph;
use include_dir::{include_dir, Dir, DirEntry};
use std::{borrow::Cow, convert::TryInto, error, fmt, io};
const CRATE_TEMPLATE_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/templates/crate");
const CONFIG_TEMPLATE: &str = include_str!("../../templates/hakari.toml-in");
/// Manages initialization of a workspace-hack package.
#[derive(Clone, Debug)]
pub struct HakariInit<'g, 'a> {
package_graph: &'g PackageGraph,
package_name: &'a str,
crate_path: &'a Utf8Path,
config: Option<(&'a Utf8Path, &'a str)>,
cargo_toml_comment: &'a str,
}
impl<'g, 'a> HakariInit<'g, 'a> {
/// Creates a new `HakariInit` with the given options. Writes out a stub config to the path if
/// specified.
///
/// `crate_path` and `config_path` are relative to the root of the workspace.
pub fn new(
package_graph: &'g PackageGraph,
package_name: &'a str,
crate_path: &'a Utf8Path,
) -> Result<Self, InitError> {
let workspace = package_graph.workspace();
let workspace_root = workspace.root();
// The package name can't already be present in the package graph.
if let Ok(existing) = workspace.member_by_name(package_name) {
return Err(InitError::PackageNameExists {
package_name: package_name.to_owned(),
workspace_path: existing
.source()
.workspace_path()
.expect("package returned by workspace")
.to_owned(),
});
}
let abs_path = workspace_root.join(crate_path);
if !abs_path.starts_with(workspace.root()) {
return Err(InitError::WorkspacePathNotInRoot {
abs_path,
workspace_root: workspace.root().to_owned(),
});
}
// The workspace path can't already exist (don't follow symlinks for this because even a
// broken symlink is an error).
match std::fs::symlink_metadata(&abs_path) {
Ok(_) => {
// The path exists.
return Err(InitError::WorkspacePathExists { abs_path });
}
Err(err) => match err.kind() {
io::ErrorKind::NotFound => {}
_ => {
return Err(InitError::Io {
path: abs_path,
error: err,
});
}
},
}
// TODO: check package name validity.
Ok(Self {
package_graph,
package_name,
crate_path,
config: None,
cargo_toml_comment: "",
})
}
/// Specifies a path, relative to the workspace root, where a stub configuration file should be
/// written out. Also accepts a comment (in TOML format) to put at the top of the file.
///
/// If this method is not called, no configuration path will be written out.
pub fn set_config(
&mut self,
path: &'a Utf8Path,
comment: &'a str,
) -> Result<&mut Self, InitError> {
// The config path can't be present already.
let abs_path = self.package_graph.workspace().root().join(path);
if abs_path.exists() {
return Err(InitError::ConfigPathExists { abs_path });
}
self.config = Some((path, comment));
Ok(self)
}
/// Specifies a comment, in TOML format, to add to the top of the workspace-hack package's
/// `Cargo.toml`.
pub fn set_cargo_toml_comment(&mut self, comment: &'a str) -> &mut Self {
self.cargo_toml_comment = comment;
self
}
/// Returns the workspace operations corresponding to this initialization.
pub fn make_ops(&self) -> WorkspaceOps<'g, 'a> {
WorkspaceOps::new(
self.package_graph,
std::iter::once(self.make_new_crate_op()),
)
}
// ---
// Helper methods
// ---
fn make_new_crate_op(&self) -> WorkspaceOp<'g, 'a> {
let files = CRATE_TEMPLATE_DIR
.find("**/*")
.expect("pattern **/* is valid")
.flat_map(|entry| {
match entry {
DirEntry::File(file) => {
let path: &Utf8Path = file
.path()
.try_into()
.expect("embedded path is valid UTF-8");
// .toml-in files need a bit of processing.
if path.extension() == Some("toml-in") {
let contents = file
.contents_utf8()
.expect("embedded .toml-in is valid UTF-8");
let contents = contents.replace("%PACKAGE_NAME%", self.package_name);
let contents =
contents.replace("%CARGO_TOML_COMMENT%\n", self.cargo_toml_comment);
Some((
Cow::Owned(path.with_extension("toml")),
Cow::Owned(contents.into_bytes()),
))
} else {
Some((Cow::Borrowed(path), Cow::Borrowed(file.contents())))
}
}
DirEntry::Dir(_) => None,
}
})
.collect();
let root_files = self
.config
.into_iter()
.map(|(path, comment)| {
let contents = CONFIG_TEMPLATE.replace("%PACKAGE_NAME%", self.package_name);
let contents = contents.replace("%CONFIG_COMMENT%\n", comment);
(Cow::Borrowed(path), Cow::Owned(contents.into_bytes()))
})
.collect();
WorkspaceOp::NewCrate {
crate_path: self.crate_path,
files,
root_files,
}
}
}
/// An error that occurred while attempting to initialize `hakari`.
#[derive(Debug)]
#[non_exhaustive]
pub enum InitError {
/// The configuration path already exists.
ConfigPathExists {
/// The absolute path of the configuration file.
abs_path: Utf8PathBuf,
},
/// The provided package name already exists.
PackageNameExists {
/// The package name that exists.
package_name: String,
/// The path at which it exists, relative to the root.
workspace_path: Utf8PathBuf,
},
/// The provided path is not within the workspace root.
WorkspacePathNotInRoot {
/// The absolute workspace path.
abs_path: Utf8PathBuf,
/// The workspace root.
workspace_root: Utf8PathBuf,
},
/// The provided workspace directory is non-empty.
WorkspacePathExists {
/// The absolute workspace path.
abs_path: Utf8PathBuf,
},
/// An IO error occurred while working with the given path.
Io {
/// The path.
path: Utf8PathBuf,
/// The error.
error: io::Error,
},
}
impl fmt::Display for InitError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
InitError::ConfigPathExists { abs_path } => {
write!(f, "config already exists at path {}", abs_path)
}
InitError::PackageNameExists {
package_name,
workspace_path,
} => {
write!(
f,
"package name {} already exists at path {}",
package_name, workspace_path
)
}
InitError::WorkspacePathNotInRoot {
abs_path,
workspace_root,
} => {
write!(
f,
"path {} is not within workspace {}",
abs_path, workspace_root
)
}
InitError::WorkspacePathExists { abs_path } => {
write!(f, "workspace path {} already exists", abs_path)
}
InitError::Io { path, .. } => {
write!(f, "IO error while accessing {}", path)
}
}
}
}
impl error::Error for InitError {
fn source(&self) -> Option<&(dyn error::Error + 'static)> {
match self {
InitError::Io { error, .. } => Some(error),
InitError::ConfigPathExists { .. }
| InitError::PackageNameExists { .. }
| InitError::WorkspacePathNotInRoot { .. }
| InitError::WorkspacePathExists { .. } => None,
}
}
}