From 263ade47ba4ca15d8166f5bbd220b6ab9dc091c8 Mon Sep 17 00:00:00 2001
From: syn <isaqtm@gmail.com>
Date: Thu, 16 Jan 2020 14:46:18 +0300
Subject: Add c/cxx support

---
 src/backends/clang.rs | 73 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 68 insertions(+), 5 deletions(-)

diff --git a/src/backends/clang.rs b/src/backends/clang.rs
index 5a0c37f..b5f9be8 100644
--- a/src/backends/clang.rs
+++ b/src/backends/clang.rs
@@ -1,12 +1,68 @@
 use serde_derive::{ Serialize, Deserialize };
-use crate::backends::Backend;
+use crate::backends::{ Backend, mk_tmp_dir };
 use std::path::Path;
+use std::process::Command;
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+use log::trace;
+
+type Result<T> = std::io::Result<T>;
 
 #[derive(Debug, Serialize, Deserialize, Default)]
 pub struct ClangBackend {
-    template: Option<String>
+    template: Option<String>,
+
+    #[serde(default)]
+    args: Vec<String>,
+
+    #[serde(default = "default_cc")]
+    cc: String,
+}
+
+
+fn default_cc() -> String {
+    "clang++".to_string()
 }
 
+
+fn get_binary_by_filename(fname: &Path) -> Result<std::path::PathBuf> {
+    let hashed_fname = {
+        let mut hasher = DefaultHasher::new();
+        fname.hash(&mut hasher);
+        format!("{:x}", hasher.finish())
+    };
+    
+    Ok(mk_tmp_dir()?.join(hashed_fname))
+}
+
+
+impl ClangBackend {
+    fn build(&self, fname: &Path) -> Result<std::path::PathBuf> {
+        let binary_fname = get_binary_by_filename(fname)?;
+        let get_mtime = |file| {
+            std::fs::metadata(file)?
+                .modified()
+        };
+        let src_mod = get_mtime(fname);
+        let binary_mod = get_mtime(&binary_fname);
+
+        if src_mod.is_err() || binary_mod.is_err() || src_mod.unwrap() > binary_mod.unwrap() {
+            let clang_status = Command::new(&self.cc)
+                .args(&self.args)
+                .arg("-x").arg("c++")
+                .arg(fname.as_os_str())
+                .arg("-o").arg(&binary_fname)
+                .arg("-lstdc++")
+                .status();
+            
+            trace!("{:#?}", clang_status);
+        }
+
+        Ok(binary_fname)
+    }
+}
+
+
 impl Backend for ClangBackend {
     fn get_template(&self) -> Option<&str> {
         match self.template {
@@ -15,7 +71,14 @@ impl Backend for ClangBackend {
         }
     }
 
-    fn run(&self, _fname: &Path) -> std::io::Result<()> {
-        todo!();
+    fn run(&self, fname: &Path) -> std::io::Result<()> {
+        let binary_fname = self.build(fname)?;
+
+        Command::new(&binary_fname)
+            .status()
+            .map(|status| {
+                trace!("{:#?}", status);
+                ()
+            })
     }
-}
\ No newline at end of file
+}
-- 
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