From 8362b077e2b4269a1a32d76bc4d9e65985f71de8 Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Mon, 5 Sep 2016 18:21:34 +0200
Subject: [PATCH] Add StoreId::from_full_path()

---
 libimagstore/src/storeid.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/libimagstore/src/storeid.rs b/libimagstore/src/storeid.rs
index 4bb26bf6..5cf2037a 100644
--- a/libimagstore/src/storeid.rs
+++ b/libimagstore/src/storeid.rs
@@ -1,3 +1,5 @@
+use std::ops::Deref;
+use std::path::Path;
 use std::path::PathBuf;
 
 use std::fmt::{Display, Debug, Formatter};
@@ -8,6 +10,7 @@ use std::path::Components;
 use libimagerror::into::IntoError;
 
 use error::StoreErrorKind as SEK;
+use error::MapErrInto;
 use store::Result;
 use store::Store;
 
@@ -24,6 +27,21 @@ impl StoreId {
         StoreId::new_baseless(id).map(|mut sid| { sid.base = base; sid })
     }
 
+    /// Try to create a StoreId object from a filesystem-absolute path.
+    ///
+    /// Automatically creates a StoreId object which has a `base` set to `store_part` if stripping
+    /// the `store_part` from the `full_path` succeeded.
+    ///
+    /// Returns a `StoreErrorKind::StoreIdBuildFromFullPathError` if stripping failes.
+    pub fn from_full_path<D>(store_part: &PathBuf, full_path: D) -> Result<StoreId>
+        where D: Deref<Target = Path>
+    {
+        let p = try!(
+            full_path.strip_prefix(store_part).map_err_into(SEK::StoreIdBuildFromFullPathError)
+        );
+        StoreId::new(Some(store_part.clone()), PathBuf::from(p))
+    }
+
     pub fn new_baseless(id: PathBuf) -> Result<StoreId> {
         if id.is_absolute() {
             Err(SEK::StoreIdLocalPartAbsoluteError.into_error())