add get specific or last backup

1 files changed, 28 insertions, 10 deletions

diff --git a/src/backup.rs b/src/backup.rs
index 69bc2ea..8cc94f1 100644
--- a/src/backup.rs
+++ b/src/backup.rs
@@ -1,6 +1,6 @@
 use std::{
-    fs::{create_dir_all, File, OpenOptions},
-    io::{ErrorKind, Read, Write},
+    fs::{create_dir_all, File},
+    io::{Read, Write},
     path::PathBuf,
     time::{SystemTime, UNIX_EPOCH},
 };
@@ -43,7 +43,7 @@ impl Backup {
 
     pub fn save(&self, config: &Config) -> Result<()> {
         let rel_location = format!(
-            "bu_{}_{}",
+            "{}_{}",
             gethostname()
                 .into_string()
                 .map_err(|_| Error::InvalidOsString)?,
@@ -66,17 +66,35 @@ impl Backup {
         Ok(())
     }
 
-    pub fn get(config: &Config, _id: Option<BackupId>) -> Result<()> {
+    pub fn get_index(config: &Config, id: Option<BackupId>) -> Result<Self> {
         let backup_index_root = format!("{}/index.json", config.root);
-        let mut file = File::open(backup_index_root)?;
-        let mut content = String::new();
-        file.read_to_string(&mut content)?;
-        let list: Vec<BackupLocation> = serde_json::from_str(&content)?;
+        let list: Vec<BackupLocation> = Self::get_json_content(&backup_index_root)?;
         println!("{list:#?}");
 
-        todo!();
+        let index_loc = if let Some(id) = id {
+            list.iter()
+                .find(|bl| bl.id == id)
+                .ok_or(Error::BackupNotFound)?
+                .rel_location
+                .clone()
+        } else {
+            list.last()
+                .ok_or(Error::BackupNotFound)?
+                .rel_location
+                .clone()
+        };
 
-        Ok(())
+        let path = format!("{}/{index_loc}/index.json", config.root);
+        let index_file: Self = Self::get_json_content(&path)?;
+
+        Ok(index_file)
+    }
+
+    fn get_json_content<T: for<'a> Deserialize<'a>>(path: &str) -> Result<T> {
+        let mut file = File::open(path)?;
+        let mut content = String::new();
+        file.read_to_string(&mut content)?;
+        Ok(serde_json::from_str(&content)?)
     }
 
     fn append_to_root_index(config: &Config, new_backup: BackupLocation) -> Result<()> {