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8 files changed, 280 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..5c2bc0e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+.vscode/
\ No newline at end of file
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e726855
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "evr"
+version = "0.1.0"
+authors = ["syn <isaqtm@gmail.com>"]
+edition = "2018"
+
+
+[dependencies]
+clap = "2.33"
+structopt = "0.3"
+serde = "1"
+toml = "0.5"
+serde_derive = "1"
+log = "0.4"
+env_logger = "0.7.1"
diff --git a/readme b/readme
new file mode 100644
index 0000000..997e0fc
--- /dev/null
+++ b/readme
@@ -0,0 +1 @@
+todo: smart time, clang
\ No newline at end of file
diff --git a/src/backends/clang.rs b/src/backends/clang.rs
new file mode 100644
index 0000000..5a0c37f
--- /dev/null
+++ b/src/backends/clang.rs
@@ -0,0 +1,21 @@
+use serde_derive::{ Serialize, Deserialize };
+use crate::backends::Backend;
+use std::path::Path;
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct ClangBackend {
+    template: Option<String>
+}
+
+impl Backend for ClangBackend {
+    fn get_template(&self) -> Option<&str> {
+        match self.template {
+            Some(ref t) => Some(t),
+            None => None
+        }
+    }
+
+    fn run(&self, _fname: &Path) -> std::io::Result<()> {
+        todo!();
+    }
+}
\ No newline at end of file
diff --git a/src/backends/mod.rs b/src/backends/mod.rs
new file mode 100644
index 0000000..729daa5
--- /dev/null
+++ b/src/backends/mod.rs
@@ -0,0 +1,20 @@
+use std::path::{ Path, PathBuf };
+
+pub mod python;
+pub mod clang;
+
+pub use python::PythonBackend;
+pub use clang::ClangBackend;
+
+pub trait Backend {
+    fn get_template(&self) -> Option<&str>;
+    fn run(&self, fname: &Path) -> std::io::Result<()>;
+
+    fn try_guess_test(&self, fname: &Path) -> Option<PathBuf> {
+        let maybe_test = fname.with_extension("txt");
+        if maybe_test.exists() {
+            return Some(maybe_test);
+        }
+        None
+    }
+}
diff --git a/src/backends/python.rs b/src/backends/python.rs
new file mode 100644
index 0000000..2776eb2
--- /dev/null
+++ b/src/backends/python.rs
@@ -0,0 +1,43 @@
+use serde_derive::{ Serialize, Deserialize };
+use crate::backends::Backend;
+use std::process::{ Command, Stdio };
+use std::path::Path;
+use log::trace;
+use std::io::{ Error, ErrorKind };
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct PythonBackend {
+    template: Option<String>,
+    version: Option<String>,
+}
+
+impl Backend for PythonBackend {
+    fn get_template(&self) -> Option<&str> {
+        match self.template {
+            Some(ref t) => Some(t),
+            None => None
+        }
+    }
+
+    fn run(&self, fname: &Path) -> std::io::Result<()> {
+        let interpreter = format!("python{}", self.version.as_ref().unwrap_or(&String::new()));
+        let stdio = match self.try_guess_test(fname) {
+            Some(test_file) => Stdio::from(std::fs::File::open(test_file)?),
+            None => Stdio::piped()
+        };
+        let timer = std::time::SystemTime::now();
+        let mut child = Command::new(interpreter)
+            .arg(fname.as_os_str())
+            .stdin(stdio)
+            .spawn()?;
+
+        let status = child.wait()?;
+        if !status.success() {
+            return Err(Error::new(ErrorKind::Other,
+                "Process exited with non-zero exit code"));
+        }
+        trace!("elapsed: {:#?}", timer.elapsed());
+
+        Ok(())
+    }
+}
\ No newline at end of file
diff --git a/src/conf.rs b/src/conf.rs
new file mode 100644
index 0000000..eec5d86
--- /dev/null
+++ b/src/conf.rs
@@ -0,0 +1,110 @@
+use serde_derive::{Serialize, Deserialize};
+use std::path::{ PathBuf, Path };
+use toml::de;
+use log::{ error, trace };
+use std::io::prelude::*;
+
+type Error = std::io::Error;
+use std::io::ErrorKind;
+
+use crate::backends::{ Backend, PythonBackend, ClangBackend };
+
+
+#[derive(Debug, Serialize, Deserialize, Default)]
+pub struct Conf {
+    #[serde(skip)]
+    path: Option<PathBuf>,
+
+    #[serde(default)]
+    python: PythonBackend,
+
+    #[serde(default)]
+    clang: ClangBackend
+}
+
+
+impl Conf {
+    pub fn get_template(&self, fname: &Path) -> &str {
+        self.get_backend(fname)
+            .and_then(|backend| backend.get_template())
+            .unwrap_or("")
+    }
+
+    pub fn get_backend(&self, fname: &Path) -> Option<Box<&dyn Backend>> {
+        let ext = fname.extension()
+                       .and_then(|ext| ext.to_str())
+                       .unwrap_or("");
+
+        match ext {
+            "py" => Some(Box::new(&self.python)),
+            "cc" | "cpp" | "cxx" => Some(Box::new(&self.clang)),
+            _ => None
+        }
+    }
+
+    pub fn run(&self, fname: &Path) -> std::io::Result<()> {
+        self.get_backend(fname)
+            .and_then(|backend| Some(backend.run(fname)))
+            .unwrap_or(Err(Error::new(ErrorKind::InvalidData, "Backend not found")))
+    }
+
+    pub fn make(&self, fname: &Path) -> std::io::Result<()> {
+        trace!("Template: {:?}", self.get_template(&fname));
+
+        std::fs::File::create(fname)?
+            .write_all(self.get_template(fname).as_bytes())?;
+
+        trace!("Written some bytes to {}", fname.to_string_lossy());
+        Ok(())
+    }
+
+    #[allow(unused)]
+    pub fn get_compiler_args(&self) -> String {
+        "somedef".to_string()
+    }
+}
+
+
+
+pub fn get_conf() -> Conf {
+    match get_conf_maybe() {
+        Ok(c) => c,
+        Err(e) => {
+            match e.kind() {
+                ErrorKind::InvalidData => error!("parse: {}", e),
+                _ => error!("{}", e)
+            };
+            Default::default()
+        }
+    }
+}
+
+
+pub fn get_conf_maybe() -> Result<Conf, Error> {
+    let mut current = std::env::current_dir()?;
+    let path = loop {
+        let candidate = current.join(".evr");
+        if candidate.exists() {
+            break candidate;
+        }
+
+        if !current.pop() {
+            error!("Not a evr subtree.");
+            return Err(Error::new(ErrorKind::NotFound, "Not a evr subtree"));
+        }
+    };
+
+    let raw_buf = std::fs::read_to_string(path.as_path())?;
+
+    let buf_result: Result<Conf, de::Error> = de::from_str(&raw_buf);
+
+    match buf_result {
+        Ok(mut buf) => {
+            buf.path = Some(path.clone());
+            Ok(buf)
+        },
+        Err(err) => {
+            Err(Error::new(ErrorKind::InvalidData, err))
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..af6a547
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,67 @@
+use clap::{AppSettings};
+use structopt::StructOpt;
+use env_logger;
+use log::{ trace, error };
+
+mod conf;
+mod backends;
+
+#[derive(StructOpt, Debug)]
+#[structopt(
+    name = "evr",
+    version = "0.1",
+    author = "by syn",
+    global_settings = &[
+        AppSettings::ColoredHelp,
+        AppSettings::UnifiedHelpMessage
+    ],
+)]
+struct EVROpts {
+    /// source filename
+    #[structopt(long, index = 1)]
+    src: String,
+
+    /// be quiet
+    #[structopt(short, long)]
+    quiet: bool,
+
+    /// optimize with this level
+    #[structopt(short, long)]
+    opt: Option<u8>,
+
+    /// show time (wall)
+    #[structopt(short, long)]
+    time: bool,
+    
+    /// show mem usage (rss)
+    #[structopt(short, long)]
+    mem: bool
+}
+
+fn main() {
+    let opts = EVROpts::from_args();
+    if !opts.quiet {
+        env_logger::builder()
+            .format_timestamp(None)
+            .init();
+    }
+
+    trace!("{:#?}", opts);
+
+    let src_path: std::path::PathBuf = opts.src.into();
+    let config = conf::get_conf();
+
+    trace!("{:#?}", config);
+
+    let (action, result) =
+    if src_path.exists() {
+        ("run", config.run(&src_path))
+    } else {
+        ("make", config.make(&src_path))
+    };
+
+    match result {
+        Ok(_) => trace!("ok {}", action),
+        Err(err) => error!("{}", err)
+    }
+}