From c3a55debe9e4194f83164d412293f27b797627af Mon Sep 17 00:00:00 2001
From: Leonardo Bishop <me@leonardobishop.com>
Date: Thu, 20 Jul 2023 22:04:45 +0100
Subject: Initial commit

---
 src/config.rs | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 src/config.rs

(limited to 'src/config.rs')

diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..2a0e38b
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,93 @@
+use std::{fs::File, path::PathBuf};
+use std::fmt;
+use std::error::Error;
+
+use serde::{Serialize, Deserialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct CopyPath {
+    pub from: String,
+    pub to: String,
+    pub recursive: bool,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum Step {
+    Link(CopyPath),
+    Copy(CopyPath),
+    Shell(String),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Stage {
+    pub name: Option<String>,
+    pub steps: Option<Vec<Step>>,
+    pub from_file: Option<String>,
+
+    #[serde(skip_deserializing)] 
+    pub base_path: PathBuf,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Config {
+    pub stages: Vec<Stage>,
+
+    #[serde(skip_deserializing)] 
+    pub base_path: PathBuf,
+}
+
+#[derive(Debug)]
+struct StageFileError {
+    stage_file: String,
+    cause: Box<dyn std::error::Error>,
+}
+
+impl Error for StageFileError {}
+
+impl fmt::Display for StageFileError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        let stage_file = &self.stage_file;
+        let cause = &self.cause.to_string();
+
+        write!(f, "Failed to load stage from file '{stage_file}': {cause}")
+    }
+}
+
+impl Config {
+    fn resolve_stage_file(base_path: PathBuf, file_name: &str) -> Result<Stage, Box<dyn std::error::Error>> {
+        let mut file_path = base_path.clone();
+        file_path.push(file_name);
+        let file = File::open(&file_path)?;
+        let stage: Stage = serde_yaml::from_reader(file)?;
+        let parent_path = file_path.parent().unwrap();
+
+        Ok(Stage { base_path: parent_path.to_path_buf(), ..stage })
+    }
+
+    pub fn from_file(file_name: &str) -> Result<Self, Box<dyn std::error::Error>> {
+        let base_path = std::env::current_dir()?;
+        let mut file_path = base_path.clone();
+        file_path.push(file_name);
+
+        let file = File::open(&file_path)?;
+        let loaded_config: Config = serde_yaml::from_reader(file)?;
+        
+        let mut stages: Vec<Stage> = Vec::new();
+        
+        for stage in loaded_config.stages {
+            if let Some(file_name) = stage.from_file {
+                match Self::resolve_stage_file(base_path.clone(), &file_name) {
+                    Ok(loaded_stage) => stages.push(loaded_stage),
+                    Err(err) => return Err(Box::new(StageFileError {
+                        stage_file: file_name,
+                        cause: err
+                    }))
+                }
+            } else {
+                stages.push(Stage { base_path: base_path.clone(), ..stage });
+            }
+        }
+        
+        Ok(Config { stages, base_path: base_path })
+    }
+}
\ No newline at end of file
-- 
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