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extern crate filetime;
extern crate url;
extern crate walkdir;
use filetime::set_file_times;
use walkdir::{WalkDir};
use std::convert;
use std::error::Error as ErrorTrait;
use std::ffi::OsStr;
use std::fmt;
use std::fs::{self, File};
use std::io::{self, Read, Write};
use std::ops;
use std::path::{Path, PathBuf};
use std::cell::RefCell;
use self::timestamp::{Timestamp, Timestamped};
pub mod timestamp;
pub const STAMP: &'static str = "tango.stamp";
thread_local! {
pub static SRC_DIR: RefCell<String> = RefCell::new("src".to_string());
pub static LIT_DIR: RefCell<String> = RefCell::new("src".to_string());
}
fn set_lit_dir(directory: String) {
LIT_DIR.with(|lit_dir| {
*lit_dir.borrow_mut() = directory
});
}
fn set_src_dir(directory: String) {
SRC_DIR.with(|src_dir| {
*src_dir.borrow_mut() = directory
});
}
pub fn get_lit_dir() -> String {
LIT_DIR.with(|lit_dir| lit_dir.borrow().clone())
}
pub fn get_src_dir() -> String {
SRC_DIR.with(|src_dir| src_dir.borrow().clone())
}
pub struct Config {
src_dir: String,
lit_dir: String,
rerun_if: bool,
}
impl Config {
pub fn new() -> Config {
Config {
src_dir: String::from("src"),
lit_dir: String::from("src"),
rerun_if: false,
}
}
pub fn set_src_dir(&mut self, new_src_dir: String) -> &mut Config {
self.src_dir = new_src_dir;
self
}
pub fn set_lit_dir(&mut self, new_lit_dir: String) -> &mut Config {
self.lit_dir = new_lit_dir;
self
}
pub fn emit_rerun_if(&mut self) -> &mut Config {
self.rerun_if = true;
self
}
}
#[derive(Debug)]
pub enum Error {
IoError(io::Error),
CheckInputError { error: check::Error },
MtimeError(PathBuf),
ConcurrentUpdate { path_buf: PathBuf, old_time: mtime, new_time: mtime },
Warnings(Vec<Warning>),
}
#[derive(Debug)]
pub enum Warning {
EncodedUrlMismatch { actual: String, expect: String }
}
impl fmt::Display for Warning {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
match *self {
Warning::EncodedUrlMismatch { ref actual, ref expect } => {
write!(w, "mismatch between encoded url, expect: {} actual: {}",
expect, actual)
}
}
}
}
impl From<md2rs::Exception> for Error {
fn from(e: md2rs::Exception) -> Self {
match e {
md2rs::Exception::IoError(e) => Error::IoError(e),
md2rs::Exception::Warnings(w) => Error::Warnings(w),
}
}
}
impl fmt::Display for Error {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
match *self {
Error::IoError(_) =>
write!(w, "IO error running `tango`"),
Error::CheckInputError { .. } =>
write!(w, "input check errors running `tango`"),
Error::MtimeError(ref p) =>
write!(w, "modification time error from `tango` checking {}",
p.to_string_lossy()),
Error::ConcurrentUpdate { ref path_buf, .. } =>
write!(w, "concurrent update during `tango` to source file {}",
path_buf.to_string_lossy()),
Error::Warnings(ref warnings) => {
for warn in warnings {
try!(write!(w, "WARNING: {}", warn));
}
Ok(())
}
}
}
}
impl ErrorTrait for Error {
fn description(&self) -> &str {
match *self {
Error::IoError(ref e) => e.description(),
Error::CheckInputError { ref error } => {
error.description()
}
Error::MtimeError(_) => "Modification time check error",
Error::ConcurrentUpdate { .. } => "concurrent update",
Error::Warnings(_) => "warnings",
}
}
fn cause(&self) -> Option<&ErrorTrait> {
match *self {
Error::IoError(ref e) => Some(e),
Error::CheckInputError { ref error, .. } => {
Some(error)
}
Error::Warnings(_) |
Error::MtimeError(_) |
Error::ConcurrentUpdate { .. } => None,
}
}
}
impl convert::From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::IoError(e)
}
}
impl convert::From<walkdir::Error> for Error {
fn from(e: walkdir::Error) -> Self {
Error::IoError(From::from(e))
}
}
pub type Result<X> = std::result::Result<X, Error>;
#[allow(non_camel_case_types)]
pub type mtime = Timestamp;
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
enum MtimeResult {
NonExistant,
Modified(mtime),
}
trait Mtime { fn modified(&self) -> Result<MtimeResult>; }
impl Mtime for File {
fn modified(&self) -> Result<MtimeResult> {
let m = try!(self.metadata());
Ok(MtimeResult::Modified(m.timestamp()))
}
}
impl Mtime for fs::DirEntry {
fn modified(&self) -> Result<MtimeResult> {
let m = try!(self.metadata());
Ok(MtimeResult::Modified(m.timestamp()))
}
}
impl Mtime for RsPath {
fn modified(&self) -> Result<MtimeResult> {
if self.0.exists() {
let f = try!(File::open(&self.0));
f.modified()
} else {
Ok(MtimeResult::NonExistant)
}
}
}
impl Mtime for MdPath {
fn modified(&self) -> Result<MtimeResult> {
if self.0.exists() {
let f = try!(File::open(&self.0));
f.modified()
} else {
Ok(MtimeResult::NonExistant)
}
}
}
pub fn process_root_with_config(config: Config) -> Result<()> {
set_lit_dir(config.lit_dir);
set_src_dir(config.src_dir);
let emit_rerun_if = config.rerun_if;
let stamp_path = Path::new(STAMP);
if stamp_path.exists() {
process_with_stamp(try!(File::open(stamp_path)), emit_rerun_if)
} else {
process_without_stamp(emit_rerun_if)
}
}
pub fn process_root() -> Result<()> {
let emit_rerun_if = false;
let stamp_path = Path::new(STAMP);
if stamp_path.exists() {
process_with_stamp(try!(File::open(stamp_path)), emit_rerun_if)
} else {
process_without_stamp(emit_rerun_if)
}
}
fn process_with_stamp(stamp: File, emit_rerun_if: bool) -> Result<()> {
println!("\n\nemit rerun if: {:?}\n\n", emit_rerun_if);
if let Ok(MtimeResult::Modified(ts)) = stamp.modified() {
println!("Rerunning tango; last recorded run was stamped: {}",
ts.date_fulltime_badly());
} else {
panic!("why are we trying to process_with_stamp when given: {:?}", stamp);
}
let mut c = try!(Context::new(Some(stamp)));
c.emit_rerun_if = emit_rerun_if;
try!(c.gather_inputs());
try!(c.generate_content());
try!(c.check_input_timestamps());
try!(c.adjust_stamp_timestamp());
Ok(())
}
fn process_without_stamp(emit_rerun_if: bool) -> Result<()> {
println!("Running tango; no previously recorded run");
println!("\n\nemit rerun if: {:?}\n\n", emit_rerun_if);
let mut c = try!(Context::new(None));
c.emit_rerun_if = emit_rerun_if;
try!(c.gather_inputs());
try!(c.generate_content());
try!(c.check_input_timestamps());
try!(c.create_stamp());
try!(c.adjust_stamp_timestamp());
Ok(())
}
#[derive(Debug)]
struct RsPath(PathBuf);
#[derive(Debug)]
struct MdPath(PathBuf);
struct Context {
orig_stamp: Option<(File, mtime)>,
src_inputs: Vec<Transform<RsPath, MdPath>>,
lit_inputs: Vec<Transform<MdPath, RsPath>>,
newest_stamp: Option<mtime>,
emit_rerun_if: bool,
}
trait Extensions {
fn extension(&self) -> Option<&str>;
fn rs_extension(&self) -> bool {
self.extension() == Some("rs")
}
fn md_extension(&self) -> bool {
self.extension() == Some("md")
}
}
impl Extensions for Path {
fn extension(&self) -> Option<&str> {
Path::extension(self).and_then(|s|s.to_str())
}
}
impl ops::Deref for RsPath {
type Target = Path; fn deref(&self) -> &Path { &self.0 }
}
impl ops::Deref for MdPath {
type Target = Path; fn deref(&self) -> &Path { &self.0 }
}
fn check_path(typename: &str, p: &Path, ext: &str, root: &str) {
println!("\n in check_path, the root is: {r:?} , path is: {p:?}, ext is {e:?}", r=root, p=p, e=ext);
if Extensions::extension(p) != Some(ext) { panic!("{t} requires `.{ext}` extension; path: {p:?}", t=typename, ext=ext, p=p); }
if !p.starts_with(root) { panic!("{t} must be rooted at `{root}/`; path: {p:?}", t=typename, root=root, p=p); }
}
impl RsPath {
fn new(p: PathBuf) -> RsPath {
check_path("RsPath", &p, "rs", &get_src_dir());
RsPath(p)
}
fn to_md(&self) -> MdPath {
let mut p = PathBuf::new();
p.push(get_lit_dir());
for c in self.0.components().skip(1) {
let c: &OsStr = c.as_ref();
p.push(c.to_str().expect("how else can I replace root?"));
}
p.set_extension("md");
MdPath::new(p)
}
}
impl MdPath {
fn new(p: PathBuf) -> MdPath {
check_path("MdPath", &p, "md", &get_lit_dir());
MdPath(p)
}
fn to_rs(&self) -> RsPath {
let mut p = PathBuf::new();
p.push(get_src_dir());
for c in self.0.components().skip(1) {
let c: &OsStr = c.as_ref();
p.push(c.to_str().expect("how else can I replace root?"));
}
p.set_extension("rs");
RsPath::new(p)
}
}
trait Transforms: Sized + Mtime + fmt::Debug {
type Target: Mtime + fmt::Debug;
fn target(&self) -> Self::Target;
fn transform(self) -> Result<Transform<Self, Self::Target>> {
let source_time = match self.modified() {
Ok(MtimeResult::Modified(t)) => t,
Ok(MtimeResult::NonExistant) => panic!("impossible for {:?} to be NonExistant", self),
Err(e) => {
println!("failure to extract mtime on source {:?}", self);
return Err(e);
}
};
let target = self.target();
let target_time = match target.modified() {
Ok(t) => t,
Err(e) => {
println!("failure to extract mtime on target {:?}", target);
return Err(e);
}
};
Ok(Transform { source_time: source_time,
target_time: target_time,
original: self,
generate: target,
})
}
}
impl Transforms for RsPath {
type Target = MdPath;
fn target(&self) -> MdPath { self.to_md() }
}
impl Transforms for MdPath {
type Target = RsPath;
fn target(&self) -> RsPath { self.to_rs() }
}
#[derive(Debug)]
pub struct Transform<X, Y> {
source_time: mtime,
target_time: MtimeResult,
original: X,
generate: Y,
}
pub mod check {
use std::error::Error as ErrorTrait;
use std::fmt;
use std::ops;
use std::path::{Path, PathBuf};
use std::result;
use super::Transform;
pub type PathTransform = Transform<PathBuf, PathBuf>;
#[derive(Debug)]
pub enum ErrorKind {
TargetYoungerThanOriginal { tgt: String, src: String },
NoTangoStampExists { tgt: String, src: String },
TangoStampOlderThanTarget { tgt: String },
}
#[derive(Debug)]
pub struct Error(ErrorKind, PathTransform);
impl fmt::Display for Error {
fn fmt(&self, w: &mut fmt::Formatter) -> fmt::Result {
match self.0 {
ErrorKind::TargetYoungerThanOriginal { ref tgt, ref src } => {
write!(w, "target `{}` is younger than source `{}`; \
therefore we assume target has modifications that need to be preserved.",
tgt, src)
}
ErrorKind::NoTangoStampExists { ref src, ref tgt } => {
write!(w, "both source `{}` and target `{}` exist but no `tango.stamp` is present",
src, tgt)
}
ErrorKind::TangoStampOlderThanTarget { ref tgt } => {
write!(w, "`tango.stamp` is older than target `{}`; \
therefore we assume source and target have diverged since last tango run.",
tgt)
}
}
}
}
impl ErrorTrait for Error {
fn description(&self) -> &str {
match self.0 {
ErrorKind::TargetYoungerThanOriginal { .. }=> {
"target is younger than source; \
therefore we assume target has modifications that need to be preserved."
}
ErrorKind::NoTangoStampExists { .. } => {
"both source and target exist but no `tango.stamp` is present"
}
ErrorKind::TangoStampOlderThanTarget { .. } => {
"`tango.stamp` is older than target; \
therefore we assume source and target have diverged since last tango run."
}
}
}
}
pub type Result<X> = result::Result<X, Error>;
impl<X,Y> Transform<X, Y>
where X: ops::Deref<Target=Path>, Y: ops::Deref<Target=Path>
{
pub fn error(&self, kind: ErrorKind) -> Error {
let t = Transform { original: self.original.to_path_buf(),
generate: self.generate.to_path_buf(),
source_time: self.source_time,
target_time: self.target_time,
};
Error(kind, t)
}
}
}
enum TransformNeed { Needed, Unneeded, }
impl Context {
fn new(opt_stamp: Option<File>) -> Result<Context> {
let stamp_modified = match opt_stamp {
None => None,
Some(stamp) => {
let mtime = try!(stamp.modified());
let mtime = match mtime {
MtimeResult::NonExistant => panic!("impossible"),
MtimeResult::Modified(t) => t,
};
Some((stamp, mtime))
}
};
let c = Context {
orig_stamp: stamp_modified,
src_inputs: Vec::new(),
lit_inputs: Vec::new(),
newest_stamp: None,
emit_rerun_if: true,
};
Ok(c)
}
fn check_transform<X, Y>(&self, t: &Transform<X, Y>) -> check::Result<TransformNeed>
where X: ops::Deref<Target=Path> + Mtime,
Y: ops::Deref<Target=Path> + Mtime,
{
use self::check::ErrorKind::*;
let t_mod = match t.target_time {
MtimeResult::Modified(t) => t,
MtimeResult::NonExistant => {
assert!(!t.generate.exists());
return Ok(TransformNeed::Needed);
}
};
let s_mod = t.source_time;
let same_age_at_low_precision = s_mod.to_ms() == t_mod.to_ms();
if t_mod > s_mod {
return Ok(TransformNeed::Unneeded);
}
if same_age_at_low_precision {
println!("Warning: source and target have timestamps that differ only at nanosecond level\n \
precision. Tango currently treats such timestamps as matching, and therefore\n \
will not rebuild the target file.\n\
\n \
source: {SRC:?} timestamp: {SRC_TS} \n \
target: {TGT:?} timestamp: {TGT_TS}\n",
SRC=t.original.display(), SRC_TS=s_mod.date_fulltime_badly(),
TGT=t.generate.display(), TGT_TS=t_mod.date_fulltime_badly());
return Ok(TransformNeed::Unneeded);
}
match self.orig_stamp {
None => return Err(t.error(NoTangoStampExists {
src: t.original.display().to_string(),
tgt: t.generate.display().to_string(),
})),
Some((_, stamp_time)) => {
let older_at_high_precision = stamp_time < t_mod;
let older_at_low_precision = stamp_time.to_ms() < t_mod.to_ms();
if older_at_low_precision {
return Err(t.error(TangoStampOlderThanTarget {
tgt: t.generate.display().to_string(),
}));
}
if older_at_high_precision && !older_at_low_precision {
println!("Warning: `tango.stamp` and target `{}` have timestamps that differ only at \n\
nanosecond level precision. Tango currently treats such timestamps as,\n\
matching and will rebuild the target file rather than error",
t.generate.display());
}
}
}
Ok(TransformNeed::Needed)
}
#[cfg(not_now)]
fn report_dir(&self, p: &Path) -> Result<()> {
let src_dir = get_src_dir();
let lit_dir = get_lit_dir();
let src_path = Path::new(&src_dir);
let lit_path = Path::new(&lit_dir);
for (i, ent) in try!(WalkDir::new(p)).enumerate() {
let ent = try!(ent);
let modified = try!(ent.modified());
println!("entry[{}]: {:?} {:?}", i, ent.path(), modified);
}
Ok(())
}
fn update_newest_time(&mut self, new_time: mtime) {
if let Some(ref mut stamp) = self.newest_stamp {
if new_time > *stamp {
*stamp = new_time;
}
} else {
self.newest_stamp = Some(new_time);
}
}
fn push_src(&mut self, t: Transform<RsPath, MdPath>) {
self.update_newest_time(t.source_time);
self.src_inputs.push(t);
}
fn push_lit(&mut self, t: Transform<MdPath, RsPath>) {
self.update_newest_time(t.source_time);
self.lit_inputs.push(t);
}
fn gather_inputs(&mut self) -> Result<()> {
let src_dir = get_src_dir();
let lit_dir = get_lit_dir();
let src_path = Path::new(&src_dir);
let lit_path = Path::new(&lit_dir);
fn keep_file_name(p: &Path) -> std::result::Result<(), &'static str> {
match p.file_name().and_then(|x|x.to_str()) {
None =>
Err("file name is not valid unicode"),
Some(s) if s.starts_with('.') =>
Err("file name has leading period"),
Some(..) =>
Ok(()),
}
}
fn warn_if_nonexistant<M:Mtime+fmt::Debug>(m: &M) -> Result<()> {
match m.modified() {
Err(e) => Err(e),
Ok(MtimeResult::Modified(..)) => Ok(()),
Ok(MtimeResult::NonExistant) => {
println!("warning: non-existant source: {:?}", m);
Ok(())
}
}
}
for ent in WalkDir::new(src_path).into_iter() {
let ent = try!(ent);
let p = ent.path();
if let Err(why) = keep_file_name(p) {
println!("skipping {}; {}", p.display(), why);
continue;
}
if !p.rs_extension() {
continue;
}
let rs = RsPath::new(p.to_path_buf());
try!(warn_if_nonexistant(&rs));
if self.emit_rerun_if {
println!("cargo:rerun-if-changed={}", &rs.display());
}
let t = try!(rs.transform());
match self.check_transform(&t) {
Ok(TransformNeed::Needed) => self.push_src(t),
Ok(TransformNeed::Unneeded) => {}
Err(e) => {
println!("gather_inputs err: {}", e.description());
return Err(Error::CheckInputError {
error: e,
})
}
}
}
for ent in WalkDir::new(lit_path).into_iter() {
let ent = try!(ent);
let p = ent.path();
if let Err(why) = keep_file_name(p) {
println!("skipping {}; {}", p.display(), why);
continue;
}
if !p.md_extension() {
continue;
}
let md = MdPath::new(p.to_path_buf());
try!(warn_if_nonexistant(&md));
if self.emit_rerun_if {
println!("cargo:rerun-if-changed={}", &md.display());
}
let t = try!(md.transform());
match self.check_transform(&t) {
Ok(TransformNeed::Needed) => {
self.push_lit(t)
}
Ok(TransformNeed::Unneeded) => {
}
Err(e) => {
println!("gather_inputs err: {}", e.description());
return Err(Error::CheckInputError {
error: e,
})
}
}
}
Ok(())
}
fn generate_content(&mut self) -> Result<()> {
for &Transform { ref original, ref generate, source_time, .. } in &self.src_inputs {
let source = try!(File::open(&original.0));
let target = try!(File::create(&generate.0));
assert!(source_time > 0);
println!("generating lit {:?}", &generate.0);
try!(rs2md(source, target));
let timestamp = source_time.to_filetime();
println!("backdating lit {:?} to {}", &generate.0, source_time.date_fulltime_badly());
try!(set_file_times(&generate.0, timestamp, timestamp));
}
for &mut Transform { ref original, ref generate, ref mut source_time, .. } in &mut self.lit_inputs {
let source = try!(File::open(&original.0));
let target = try!(File::create(&generate.0));
assert!(*source_time > 0);
println!("generating src {:?}", &generate.0);
try!(md2rs(source, target));
println!("backdating src {:?} to {}", &generate.0, source_time.date_fulltime_badly());
try!(set_file_times(&generate.0,
source_time.to_filetime(),
source_time.to_filetime()));
let source = try!(File::open(&original.0));
let target = try!(File::open(&generate.0));
match (source.modified(), target.modified()) {
(Ok(MtimeResult::Modified(src_time)),
Ok(MtimeResult::Modified(tgt_time))) => {
#[cfg(not_possible_right_now)] assert_eq!(src_time, tgt_time);
assert_eq!(src_time.to_ms(), tgt_time.to_ms());
}
(Ok(MtimeResult::NonExistant), _) => panic!("how could source not exist"),
(_, Ok(MtimeResult::NonExistant)) => panic!("how could target not exist"),
(Err(_), Err(_)) => panic!("errored looking up both source and target times"),
(Err(_), _) => panic!("errored looking up source time"),
(_, Err(_)) => panic!("errored looking up target time"),
}
}
Ok(())
}
fn check_input_timestamps(&mut self) -> Result<()> {
for &Transform { ref original, source_time, .. } in &self.src_inputs {
if let MtimeResult::Modified(new_time) = try!(original.modified()) {
if new_time != source_time {
return Err(Error::ConcurrentUpdate {
path_buf: original.to_path_buf(),
old_time: source_time,
new_time: new_time,
})
}
}
}
for &Transform { ref original, source_time, .. } in &self.lit_inputs {
if let MtimeResult::Modified(new_time) = try!(original.modified()) {
if new_time != source_time {
return Err(Error::ConcurrentUpdate {
path_buf: original.to_path_buf(),
old_time: source_time,
new_time: new_time,
})
}
}
}
Ok(())
}
fn create_stamp(&mut self) -> Result<()> {
let _f = try!(File::create(STAMP));
Ok(())
}
fn adjust_stamp_timestamp(&mut self) -> Result<()> {
if let Some(stamp) = self.newest_stamp {
assert!(stamp > 0);
println!("re-stamping tango.stamp to {}", stamp.date_fulltime_badly());
match set_file_times(STAMP, stamp.to_filetime(), stamp.to_filetime()) {
Ok(()) => Ok(()),
Err(e) => Err(Error::IoError(e)),
}
} else {
Ok(())
}
}
}
fn rs2md<R:Read, W:Write>(source: R, target: W) -> Result<()> {
let mut converter = rs2md::Converter::new();
converter.convert(source, target).map_err(Error::IoError)
}
fn md2rs<R:Read, W:Write>(source: R, target: W) -> Result<()> {
let converter = md2rs::Converter::new();
converter.convert(source, target).map_err(From::from)
}
mod md2rs;
mod rs2md;
fn encode_to_url(code: &str) -> String {
use url::percent_encoding as enc;
let new_code: String = enc::utf8_percent_encode(code.trim(), enc::USERINFO_ENCODE_SET).collect();
format!("https://play.rust-lang.org/?code={}&version=nightly", new_code)
}
#[cfg(test)]
mod testing;