From 0568defd3fe3481035b2d249ea2376f3ffdf69c1 Mon Sep 17 00:00:00 2001
From: Daniel Schadt <kingdread@gmx.de>
Date: Tue, 9 Nov 2021 18:51:42 +0100
Subject: implement a simple directory installer

---
 modderbaas/src/baas.rs | 48 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/modderbaas/src/baas.rs b/modderbaas/src/baas.rs
index c88e2b4..098c7dd 100644
--- a/modderbaas/src/baas.rs
+++ b/modderbaas/src/baas.rs
@@ -1,10 +1,14 @@
 //! This module contains functions to query & manipulate the global Minetest installation.
-use std::{collections::HashMap, path::PathBuf};
+use std::{
+    collections::HashMap,
+    path::{Path, PathBuf},
+};
 
 use dirs;
 use log::debug;
 
 use super::{
+    contentdb::ContentDb,
     download::{Downloader, Source},
     error::{Error, Result},
     game::Game,
@@ -355,3 +359,45 @@ pub trait Installer {
         Ok(world.enable_mod(&minemod.mod_id()?)?)
     }
 }
+
+/// An [`Installer`] that simply installs mods to the given directory.
+///
+/// It resolves mods by checking if there is a single candidate. If yes, that one is taken - if
+/// not, an error is returned ([`Error::AmbiguousModId`]). No user interaction is expected or done.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct DirInstaller<'p> {
+    dir: &'p Path,
+}
+
+impl<'p> DirInstaller<'p> {
+    /// Create a new dir installer that installs mods to the given directory.
+    pub fn new(dir: &'p Path) -> Self {
+        DirInstaller { dir }
+    }
+
+    /// The path to the directory in which this installer installs mods.
+    pub fn dir(&self) -> &Path {
+        self.dir
+    }
+}
+
+impl<'p> Installer for DirInstaller<'p> {
+    type Error = Error;
+
+    fn resolve(&mut self, mod_id: &str) -> Result<Source, Self::Error> {
+        let content_db = ContentDb::new();
+        let candidates = content_db.resolve(mod_id)?;
+        if candidates.len() == 1 {
+            Ok(Source::Http(candidates.into_iter().next().unwrap().url))
+        } else {
+            Err(Error::AmbiguousModId(mod_id.into()))
+        }
+    }
+
+    fn install_mod(
+        &mut self,
+        mod_or_pack: &dyn ModContainer,
+    ) -> Result<Box<dyn ModContainer>, Self::Error> {
+        mod_or_pack.install_to(self.dir)
+    }
+}
-- 
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