Init

src/model/file.rs

@@ -0,0 +1,89 @@
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+use serde::{Deserialize, Serialize};
+
+use super::{Bank, Project};
+
+const VERSION: u8 = 1;
+
+#[derive(Serialize, Deserialize)]
+struct ProjectFile {
+    version: u8,
+    banks: Vec<Bank>,
+    #[serde(default)]
+    sample_paths: Vec<PathBuf>,
+    #[serde(default = "default_tempo")]
+    tempo: f64,
+}
+
+fn default_tempo() -> f64 {
+    120.0
+}
+
+impl From<&Project> for ProjectFile {
+    fn from(project: &Project) -> Self {
+        Self {
+            version: VERSION,
+            banks: project.banks.clone(),
+            sample_paths: project.sample_paths.clone(),
+            tempo: project.tempo,
+        }
+    }
+}
+
+impl From<ProjectFile> for Project {
+    fn from(file: ProjectFile) -> Self {
+        Self {
+            banks: file.banks,
+            sample_paths: file.sample_paths,
+            tempo: file.tempo,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum FileError {
+    Io(io::Error),
+    Json(serde_json::Error),
+    Version(u8),
+}
+
+impl std::fmt::Display for FileError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            FileError::Io(e) => write!(f, "IO error: {e}"),
+            FileError::Json(e) => write!(f, "JSON error: {e}"),
+            FileError::Version(v) => write!(f, "Unsupported version: {v}"),
+        }
+    }
+}
+
+impl From<io::Error> for FileError {
+    fn from(e: io::Error) -> Self {
+        FileError::Io(e)
+    }
+}
+
+impl From<serde_json::Error> for FileError {
+    fn from(e: serde_json::Error) -> Self {
+        FileError::Json(e)
+    }
+}
+
+pub fn save(project: &Project, path: &Path) -> Result<(), FileError> {
+    let file = ProjectFile::from(project);
+    let json = serde_json::to_string_pretty(&file)?;
+    fs::write(path, json)?;
+    Ok(())
+}
+
+pub fn load(path: &Path) -> Result<Project, FileError> {
+    let json = fs::read_to_string(path)?;
+    let file: ProjectFile = serde_json::from_str(&json)?;
+    if file.version > VERSION {
+        return Err(FileError::Version(file.version));
+    }
+    Ok(Project::from(file))
+}