Add header editing support

lib/entry/libimagentryedit/Cargo.toml

@@ -21,6 +21,7 @@ maintenance                       = { status     = "actively-developed" }
 
 [dependencies]
 error-chain = "0.11"
+toml        = "0.4"
 
 libimagerror = { version = "0.7.0", path = "../../../lib/core/libimagerror" }
 libimagrt    = { version = "0.7.0", path = "../../../lib/core/libimagrt" }

lib/entry/libimagentryedit/src/edit.rs

@@ -29,6 +29,11 @@ pub trait Edit {
     fn edit_content(&mut self, rt: &Runtime) -> Result<()>;
 }
 
+pub trait EditHeader : Edit {
+    fn edit_header(&mut self, rt: &Runtime)             -> Result<()>;
+    fn edit_header_and_content(&mut self, rt: &Runtime) -> Result<()>;
+}
+
 impl Edit for String {
 
     fn edit_content(&mut self, rt: &Runtime) -> Result<()> {
@@ -46,6 +51,24 @@ impl Edit for Entry {
 
 }
 
+impl EditHeader for Entry {
+
+    fn edit_header(&mut self, rt: &Runtime) -> Result<()> {
+        let mut header = ::toml::ser::to_string_pretty(self.get_header())?;
+        let _          = edit_in_tmpfile(rt, &mut header)?;
+        let header     = ::toml::de::from_str(&header)?;
+        *self.get_header_mut() = header;
+        Ok(())
+    }
+
+    fn edit_header_and_content(&mut self, rt: &Runtime) -> Result<()> {
+        let mut header_and_content = self.to_str();
+        let _                      = edit_in_tmpfile(rt, &mut header_and_content)?;
+        self.replace_from_buffer(&header_and_content).map_err(EE::from)
+    }
+
+}
+
 pub fn edit_in_tmpfile(rt: &Runtime, s: &mut String) -> Result<()> {
     use libimagutil::edit::edit_in_tmpfile_with_command;
 

lib/entry/libimagentryedit/src/error.rs

@@ -22,6 +22,16 @@ error_chain! {
         EditError, EditErrorKind, ResultExt, Result;
     }
 
+    links {
+        StoreError(::libimagstore::error::StoreError, ::libimagstore::error::StoreErrorKind);
+    }
+
+    foreign_links {
+        TomlSerError(::toml::ser::Error);
+        TomlDeserError(::toml::de::Error);
+    }
+
+
     errors {
         IOError             {
             description("IO Error")

lib/entry/libimagentryedit/src/lib.rs

@@ -40,6 +40,7 @@ extern crate libimagstore;
 extern crate libimagrt;
 extern crate libimagutil;
 #[macro_use] extern crate error_chain;
+extern crate toml;
 
 pub mod edit;
 pub mod error;