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#[cfg(all(feature = "codespan-reporting", not(feature = "spanned")))]
compile_error!("use of `codespan-reporting` feature is forbidden, use `spanned` INSTEAD");
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate toml;
extern crate unicode_segmentation;
extern crate fmt2io;
extern crate cargo_toml;
#[cfg(feature = "man")]
extern crate man;
#[cfg(feature = "spanned")]
extern crate codespan_reporting;
pub(crate) mod config;
pub(crate) mod codegen;
#[cfg(feature = "man")]
pub (crate) mod gen_man;
#[cfg(feature = "debconf")]
pub (crate) mod debconf;
pub mod manifest;
use std::borrow::Borrow;
use std::fmt;
use std::io::{self, Read, Write};
use std::path::{Path, PathBuf};
use manifest::LoadManifest;
#[cfg(feature = "spanned")]
type FileSpec = codespan_reporting::files::SimpleFile<String, String>;
#[cfg(not(feature = "spanned"))]
type FileSpec = ();
#[derive(Debug)]
enum ErrorData {
Input(InputError),
Io(io::Error),
Open { file: PathBuf, error: io::Error },
Manifest(manifest::Error),
MissingManifestDirEnvVar,
MissingOutDir,
#[cfg(feature = "debconf")]
Debconf(debconf::Error),
}
#[derive(Debug)]
struct InputError {
#[cfg_attr(not(feature = "spanned"), allow(unused))]
file: FileSpec,
source: InputErrorSource,
}
#[derive(Debug)]
enum InputErrorSource {
Toml(toml::de::Error),
Config(Vec<config::ValidationError>),
}
impl InputError {
#[cfg(feature = "spanned")]
fn to_diagnostics(&self) -> impl Iterator<Item=codespan_reporting::diagnostic::Diagnostic<()>> + '_ {
use codespan_reporting::diagnostic::Label;
match &self.source {
InputErrorSource::Toml(error) => {
let diagnostic = codespan_reporting::diagnostic::Diagnostic::error()
.with_message("failed to parse config specification");
let diagnostic = match error.line_col() {
Some((line, col)) => {
let line_sum = self.file.source().split('\n').take(line).map(|line| line.len()).sum::<usize>();
let start = line_sum + col + line;
let end = start + 1;
diagnostic.with_labels(vec![
Label::primary((), start..end).with_message(error.to_string()),
])
},
None => diagnostic.with_notes(vec![error.to_string()]),
};
Some(diagnostic).into_iter().chain(None.into_iter().flatten())
},
InputErrorSource::Config(errors) => None.into_iter().chain(Some(errors.iter().map(|error| error.to_diagnostic(()))).into_iter().flatten()),
}
}
}
impl fmt::Display for InputError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match &self.source {
InputErrorSource::Toml(err) => write!(f, "failed to parse config specification: {}", err),
InputErrorSource::Config(errors) => {
for error in errors {
fmt::Display::fmt(&error, f)?;
writeln!(f)?;
}
Ok(())
},
}
}
}
impl From<toml::de::Error> for InputErrorSource {
fn from(value: toml::de::Error) -> Self {
InputErrorSource::Toml(value)
}
}
impl From<Vec<config::ValidationError>> for InputErrorSource {
fn from(value: Vec<config::ValidationError>) -> Self {
InputErrorSource::Config(value)
}
}
pub struct Error {
data: ErrorData,
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match &self.data {
ErrorData::Manifest(error) => write!(f, "failed to process manifest: {}", error),
ErrorData::Input(error) => fmt::Display::fmt(error, f),
ErrorData::Io(err) => write!(f, "I/O error: {}", err),
ErrorData::Open { file, error } => write!(f, "failed to open file {}: {}", file.display(), error),
ErrorData::MissingManifestDirEnvVar => write!(f, "missing environment variable: CARGO_MANIFEST_DIR"),
ErrorData::MissingOutDir => write!(f, "missing environment variable: OUT_DIR"),
#[cfg(feature = "debconf")]
ErrorData::Debconf(err) => write!(f, "failed to generate debconf: {}", err),
}
}
}
impl fmt::Debug for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
#[cfg(feature = "spanned")]
{
use codespan_reporting::term::termcolor::{NoColor};
struct WrapIo<W: fmt::Write>(W);
impl<W: fmt::Write> std::io::Write for WrapIo<W> {
fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
self.0.write_str(std::str::from_utf8(buf).unwrap()).map_err(|_| std::io::ErrorKind::Other)?;
Ok(buf.len())
}
fn write_all(&mut self, buf: &[u8]) -> std::io::Result<()> {
self.0.write_str(std::str::from_utf8(buf).unwrap()).map_err(|_| std::io::ErrorKind::Other.into())
}
fn flush(&mut self) -> std::io::Result<()> {
Ok(())
}
}
if let ErrorData::Input(error) = &self.data {
writeln!(f, "invalid config specification:")?;
let diagnostics = error.to_diagnostics();
let mut writer = NoColor::new(WrapIo(&mut *f));
let config = codespan_reporting::term::Config::default();
for diagnostic in diagnostics {
match codespan_reporting::term::emit(&mut writer, &config, &error.file, &diagnostic) {
Ok(()) => (),
Err(codespan_reporting::files::Error::Io(_)) => return Err(fmt::Error),
Err(other) => panic!("unexpected error: {}", other),
}
}
return Ok(());
}
}
fmt::Display::fmt(self, f)
}
}
#[cfg(not(feature = "spanned"))]
impl Error {
pub fn report(&self) -> std::io::Result<()> {
write!(std::io::stderr().lock(), "{}", self)
}
}
#[cfg(feature = "spanned")]
impl Error {
pub fn report(&self) -> std::io::Result<()> {
use codespan_reporting::term::termcolor::{ColorChoice, StandardStream};
if let ErrorData::Input(error) = &self.data {
let diagnostics = error.to_diagnostics();
let writer = StandardStream::stderr(ColorChoice::Always);
let mut writer = writer.lock();
let config = codespan_reporting::term::Config::default();
for diagnostic in diagnostics {
match codespan_reporting::term::emit(&mut writer, &config, &error.file, &diagnostic) {
Ok(()) => (),
Err(codespan_reporting::files::Error::Io(error)) => return Err(error),
Err(other) => panic!("unexpected error: {}", other),
}
}
Ok(())
} else {
write!(std::io::stderr().lock(), "{}", self)
}
}
}
impl Error {
pub fn report_and_exit(&self) -> ! {
self.report().expect("failed to write to stderr");
std::process::exit(1);
}
}
impl From<ErrorData> for Error {
fn from(data: ErrorData) -> Self {
Error {
data,
}
}
}
impl From<io::Error> for Error {
fn from(err: io::Error) -> Self {
Error {
data: ErrorData::Io(err),
}
}
}
impl From<manifest::Error> for Error {
fn from(err: manifest::Error) -> Self {
Error {
data: ErrorData::Manifest(err),
}
}
}
impl From<manifest::LoadError> for Error {
fn from(err: manifest::LoadError) -> Self {
Error {
data: ErrorData::Manifest(err.into()),
}
}
}
impl From<void::Void> for Error {
fn from(value: void::Void) -> Self {
match value {}
}
}
#[cfg(feature = "debconf")]
impl From<debconf::Error> for Error {
fn from(err: debconf::Error) -> Self {
Error {
data: ErrorData::Debconf(err),
}
}
}
fn load<S: Read, N: fmt::Display>(mut source: S, name: N) -> Result<config::Config, Error> {
let mut data = String::new();
source.read_to_string(&mut data)?;
(|| {
let cfg = toml::from_str::<config::raw::Config>(&data)?;
let cfg = cfg.validate()?;
Ok(cfg)
})().map_err(|source| {
#[cfg(feature = "spanned")]
{
ErrorData::Input(InputError { file: FileSpec::new(name.to_string(), data), source }).into()
}
#[cfg(not(feature = "spanned"))]
{
let _ = name;
ErrorData::Input(InputError{ file: (), source }).into()
}
})
}
fn load_from_file<P: AsRef<Path>>(source: P) -> Result<::config::Config, Error> {
let config_spec = std::fs::File::open(&source).map_err(|error| ErrorData::Open { file: source.as_ref().into(), error })?;
load(config_spec, source.as_ref().display())
}
fn path_in_out_dir<P: AsRef<Path>>(file_name: P) -> Result<PathBuf, Error> {
let mut out: PathBuf = std::env::var_os("OUT_DIR").ok_or(ErrorData::MissingOutDir)?.into();
out.push(file_name);
Ok(out)
}
fn default_out_file(binary: Option<&str>) -> Result<PathBuf, Error> {
const GENERATED_FILE_NAME: &str = "configure_me_config.rs";
let file_name_owned;
let file_name = match binary {
Some(binary) => {
file_name_owned = format!("{}_{}", binary, GENERATED_FILE_NAME);
&file_name_owned
},
None => GENERATED_FILE_NAME,
};
path_in_out_dir(file_name)
}
fn create_file<P: AsRef<Path> + Into<PathBuf>>(file: P) -> Result<std::fs::File, Error> {
std::fs::File::create(&file)
.map_err(|error| ErrorData::Open { file: file.into(), error })
.map_err(Into::into)
}
fn generate_to_file<P: AsRef<Path> + Into<PathBuf>>(config_spec: &::config::Config, file: P) -> Result<(), Error> {
let config_code = create_file(file)?;
::fmt2io::write(config_code, |config_code| codegen::generate_code(config_spec, config_code)).map_err(Into::into)
}
fn load_and_generate_default<P: AsRef<Path>>(source: P, binary: Option<&str>) -> Result<::config::Config, Error> {
let config_spec = load_from_file(&source)?;
generate_to_file(&config_spec, default_out_file(binary)?)?;
#[cfg(feature = "debconf")]
debconf::generate_if_requested(&config_spec)?;
println!("cargo:rerun-if-changed={}", source.as_ref().display());
Ok(config_spec)
}
pub fn generate_source<S: Read, O: Write>(source: S, output: O) -> Result<(), Error> {
let cfg = load(source, "unknown file")?;
::fmt2io::write(output, |output| codegen::generate_code(&cfg, output)).map_err(Into::into)
}
#[deprecated = "Use build_script_auto and put the path into Cargo.toml to expose it to external tools"]
pub fn build_script<P: AsRef<Path>>(source: P) -> Result<(), Error> {
load_and_generate_default(source, None).map(::std::mem::drop)
}
pub fn build_script_auto() -> Result<(), Error> {
use manifest::SpecificationPaths;
let manifest_dir = manifest::get_dir()?;
let manifest_file = manifest_dir.join("Cargo.toml");
let paths = manifest_file
.load_manifest()?
.package.ok_or(manifest::Error::MissingPackage)?
.metadata.ok_or(manifest::Error::MissingMetadata)?
.configure_me.ok_or(manifest::Error::MissingConfigureMeMetadata)?
.spec_paths;
match paths {
SpecificationPaths::Single(path) => load_and_generate_default(manifest_dir.join(path), None).map(::std::mem::drop),
SpecificationPaths::PerBinary(binaries) => {
for (binary, path) in binaries {
load_and_generate_default(manifest_dir.join(path), Some(&binary)).map(::std::mem::drop)?;
}
Ok(())
},
SpecificationPaths::Other(other) => match other._private {},
}
}
#[cfg(feature = "unstable-metabuild")]
pub fn metabuild() {
build_script_auto().unwrap_or_else(|error| {
println!("Could not generate configuration parser: {}", error);
std::process::exit(1)
})
}
#[cfg(feature = "man")]
#[deprecated = "use of cfg_me crate to build man pages is cleaner"]
pub fn build_script_with_man<P: AsRef<Path>>(source: P) -> Result<(), Error> {
#[allow(deprecated)]
build_script_with_man_written_to(source, path_in_out_dir("app.man")?)
}
#[cfg(feature = "man")]
#[deprecated = "use of cfg_me crate to build man pages is cleaner"]
pub fn build_script_with_man_written_to<P: AsRef<Path>, M: AsRef<Path> + Into<PathBuf>>(source: P, output: M) -> Result<(), Error> {
let config_spec = load_and_generate_default(source, None)?;
let manifest = manifest::BuildScript.load_manifest()?;
let man_page = gen_man::generate_man_page(&config_spec, manifest.borrow())?;
let mut file = create_file(output)?;
file.write_all(man_page.as_bytes())?;
#[cfg(feature = "debconf")]
debconf::generate_if_requested(&config_spec)?;
Ok(())
}
#[cfg(feature = "man")]
pub fn generate_man<M: LoadManifest, W: std::io::Write, S: AsRef<Path>>(source: S, mut dest: W, manifest: M) -> Result<(), Error> where Error: std::convert::From<<M as manifest::LoadManifest>::Error> {
let config_spec = load_from_file(&source)?;
let manifest = manifest.load_manifest()?;
let man_page = gen_man::generate_man_page(&config_spec, manifest.borrow())?;
dest.write_all(man_page.as_bytes())?;
Ok(())
}
#[cfg(test)]
#[deny(warnings)]
pub(crate) mod tests {
use ::generate_source;
pub const SINGLE_OPTIONAL_PARAM: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
"#;
pub const SINGLE_MANDATORY_PARAM: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
optional = false
"#;
pub const SINGLE_DEFAULT_PARAM: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
default = "42"
"#;
pub const SINGLE_SWITCH: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[switch]]
name = "foo"
"#;
pub const MULTIPLE_PARAMS: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
default = "42"
doc = "A foo"
[[param]]
name = "bar"
type = "String"
optional = true
doc = "A very, very, very, very, very, very, very, very, very, very, very, very, very, very long documentation..."
[[param]]
name = "baz"
type = "String"
optional = false
doc = "A much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much, much longer documentation..."
[[switch]]
name = "verbose"
# doc intentionally missing, because it's obious...
[[switch]]
name = "fast"
default = true
doc = "Determines whether to mine bitcoins fast or slowly"
"#;
pub const NO_ARG: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
argument = false
"#;
pub const SHORT_SWITCHES: &str =
r#"
[[switch]]
name = "a"
abbr = "a"
doc = "test"
[[switch]]
name = "b"
abbr = "b"
[[switch]]
name = "c"
abbr = "c"
count = true
[[param]]
name = "d"
type = "String"
abbr = "d"
optional = true
[[param]]
name = "e"
type = "String"
abbr = "e"
optional = true
[[switch]]
name = "foo_bar"
abbr = "f"
"#;
pub const CONF_FILES: &str =
r#"
[general]
env_prefix = "TEST_APP"
conf_file_param = "config"
conf_dir_param = "conf_dir"
[[param]]
name = "foo"
type = "u32"
doc = "A foo"
"#;
pub const CUSTOM_MERGE_FN: &str =
r#"
[general]
env_prefix = "TEST_APP"
[[param]]
name = "foo"
type = "u32"
merge_fn = "(|a: &mut u32, b: u32| *a += b)"
[[param]]
name = "bar"
type = "String"
merge_fn = "(|a: &mut String, b: String| a.push_str(&b))"
"#;
pub struct ExpectedOutput {
pub raw_config: &'static str,
pub validate: &'static str,
pub merge_in: &'static str,
pub merge_args: &'static str,
pub config: &'static str,
pub arg_parse_error: &'static str,
}
pub const EXPECTED_EMPTY: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/empty/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/empty/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/empty/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/empty/merge_args.rs"),
config: include_str!("../tests/expected_outputs/empty/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/empty/arg_parse_error.rs"),
};
pub const EXPECTED_SINGLE_OPTIONAL_PARAM: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/single_optional_param/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/single_optional_param/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/single_optional_param/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/single_optional_param/merge_args.rs"),
config: include_str!("../tests/expected_outputs/single_optional_param/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/single_optional_param/arg_parse_error.rs"),
};
pub const EXPECTED_SINGLE_MANDATORY_PARAM: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/single_mandatory_param/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/single_mandatory_param/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/single_mandatory_param/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/single_mandatory_param/merge_args.rs"),
config: include_str!("../tests/expected_outputs/single_mandatory_param/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/single_mandatory_param/arg_parse_error.rs"),
};
pub const EXPECTED_SINGLE_DEFAULT_PARAM: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/single_default_param/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/single_default_param/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/single_default_param/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/single_default_param/merge_args.rs"),
config: include_str!("../tests/expected_outputs/single_default_param/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/single_default_param/arg_parse_error.rs"),
};
pub const EXPECTED_SINGLE_SWITCH: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/single_switch/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/single_switch/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/single_switch/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/single_switch/merge_args.rs"),
config: include_str!("../tests/expected_outputs/single_switch/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/single_switch/arg_parse_error.rs"),
};
pub const EXPECTED_SHORT_SWITCHES: ExpectedOutput = ExpectedOutput {
raw_config: include_str!("../tests/expected_outputs/short_switches/raw_config.rs"),
validate: include_str!("../tests/expected_outputs/short_switches/validate.rs"),
merge_in: include_str!("../tests/expected_outputs/short_switches/merge_in.rs"),
merge_args: include_str!("../tests/expected_outputs/short_switches/merge_args.rs"),
config: include_str!("../tests/expected_outputs/short_switches/config.rs"),
arg_parse_error: include_str!("../tests/expected_outputs/short_switches/arg_parse_error.rs"),
};
fn check(src: &str, expected: &str) {
use std::io::Write;
let mut src = src.as_bytes();
let mut out = Vec::new();
generate_source(&mut src, &mut out).unwrap();
if out != expected.as_bytes() {
let mut expected_temp = tempfile::Builder::new().prefix("expected").tempfile().unwrap();
let mut out_temp = tempfile::Builder::new().prefix("output").tempfile().unwrap();
expected_temp.write_all(expected.as_bytes()).unwrap();
out_temp.write_all(&out).unwrap();
std::process::Command::new("diff")
.arg(expected_temp.path())
.arg(out_temp.path())
.spawn()
.expect("failed to run diff")
.wait()
.unwrap();
panic!("output differs from expected");
}
}
#[test]
fn empty() {
check("", include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/empty-config.rs")));
}
#[test]
fn single_optional_param() {
check(SINGLE_OPTIONAL_PARAM, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/single_optional_param-config.rs")));
}
#[test]
fn single_mandatory_param() {
check(SINGLE_MANDATORY_PARAM, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/single_mandatory_param-config.rs")));
}
#[test]
fn single_default_param() {
check(SINGLE_DEFAULT_PARAM, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/single_default_param-config.rs")));
}
#[test]
fn single_switch() {
check(SINGLE_SWITCH, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/single_switch-config.rs")));
}
#[test]
fn multiple_params() {
check(MULTIPLE_PARAMS, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/multiple_params-config.rs")));
}
#[test]
fn no_arg() {
check(NO_ARG, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/no_arg-config.rs")));
}
#[test]
fn short_switches() {
check(SHORT_SWITCHES, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/short_switches-config.rs")));
}
#[test]
fn conf_files() {
check(CONF_FILES, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/conf_files-config.rs")));
}
#[test]
fn custom_merge_fn() {
check(CUSTOM_MERGE_FN, include_str!(concat!(env!("OUT_DIR"), "/expected_outputs/with_custom_merge-config.rs")));
}
}