added documentation for project name autocompletion

README.md

@@ -107,4 +107,18 @@ bartib edit -e vim
 
 ```
 bartib last
+```
+
+### List all projects
+
+This command lists all projects for which an activity has ever been logged:
+
+```
+bartib projects
+```
+
+This is especially useful for autocompletion. For example, adding this line to the `.bashrc` enables autocompletion for project names:
+
+```
+complete -W "$(bartib projects)" bartib
 ```

src/lib.rs

@@ -120,7 +120,7 @@ pub fn list_projects(file_name: &str) -> Result<()> {
     all_projects.dedup();
 
     for project in all_projects {
-        println!("{}", project);
+        println!("\"{}\"", project);
     }
 
     Ok(())