From 75ff2c742f7a541df585b7bd118259b2c2971986 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Thu, 24 Mar 2016 11:50:37 +0100
Subject: [PATCH] Add edit codebase

---
 libimagrt/src/edit.rs | 76 +++++++++++++++++++++++++++++++++++++++++++
 libimagrt/src/lib.rs  |  3 +-
 2 files changed, 78 insertions(+), 1 deletion(-)
 create mode 100644 libimagrt/src/edit.rs

diff --git a/libimagrt/src/edit.rs b/libimagrt/src/edit.rs
new file mode 100644
index 00000000..a34a4bf1
--- /dev/null
+++ b/libimagrt/src/edit.rs
@@ -0,0 +1,76 @@
+use std::ops::DerefMut;
+
+use runtime::Runtime;
+use error::RuntimeError;
+use error::RuntimeErrorKind;
+
+use libimagstore::store::FileLockEntry;
+use libimagstore::store::Entry;
+
+pub type EditResult<T> = Result<T, RuntimeError>;
+
+pub trait Edit {
+    fn edit_content(&mut self, rt: &Runtime) -> EditResult<()>;
+}
+
+impl Edit for Entry {
+
+    fn edit_content(&mut self, rt: &Runtime) -> EditResult<()> {
+        edit_in_tmpfile(rt, self.get_content_mut())
+            .map(|_| ())
+    }
+
+}
+
+impl<'a> Edit for FileLockEntry<'a> {
+
+    fn edit_content(&mut self, rt: &Runtime) -> EditResult<()> {
+        self.deref_mut().edit_content(rt)
+    }
+
+}
+
+pub fn edit_in_tmpfile(rt: &Runtime, s: &mut String) -> EditResult<()> {
+    use tempfile::NamedTempFile;
+    use std::io::Seek;
+    use std::io::Read;
+    use std::io::SeekFrom;
+    use std::io::Write;
+
+    let file = NamedTempFile::new();
+    if file.is_err() {
+        return Err(RuntimeError::new(RuntimeErrorKind::Instantiate, None));
+    }
+    let file      = file.unwrap();
+    let file_path = file.path();
+    let file      = file.reopen();
+
+    if file.is_err() {
+        return Err(RuntimeError::new(RuntimeErrorKind::IOError, Some(Box::new(file.err().unwrap()))));
+    }
+
+    let mut file = file.unwrap();
+    file.write_all(&s.clone().into_bytes()[..]);
+
+    if let Err(e) = file.sync_data() {
+        return Err(RuntimeError::new(RuntimeErrorKind::IOError, Some(Box::new(e))));
+    }
+
+    if let Some(mut editor) = rt.editor() {
+        let exit_status = editor.arg(file_path).status();
+
+        match exit_status.map(|s| s.success()) {
+            Ok(true) => {
+                file.sync_data()
+                    .and_then(|_| file.seek(SeekFrom::Start(0)))
+                    .and_then(|_| file.read_to_string(s))
+                    .map(|_| ())
+                    .map_err(|e| RuntimeError::new(RuntimeErrorKind::IOError, Some(Box::new(e))))
+            },
+            Ok(_)    => Err(RuntimeError::new(RuntimeErrorKind::ProcessExitFailure, None)),
+            Err(e)   => Err(RuntimeError::new(RuntimeErrorKind::IOError, Some(Box::new(e)))),
+        }
+    } else {
+        Err(RuntimeError::new(RuntimeErrorKind::Instantiate, None))
+    }
+}
diff --git a/libimagrt/src/lib.rs b/libimagrt/src/lib.rs
index 6ca795d0..28fb6a1c 100644
--- a/libimagrt/src/lib.rs
+++ b/libimagrt/src/lib.rs
@@ -10,8 +10,9 @@ extern crate libimagstore;
 extern crate libimagutil;
 
 mod configuration;
-mod error;
 mod logger;
 
+pub mod edit;
+pub mod error;
 pub mod runtime;