feat: change how command line interface works

Easier to use now. --config before subcommand was annoying.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..9ba4a7f
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,33 @@
+use log::debug;
+use serde::Deserialize;
+use std::default::Default;
+use std::fs;
+use std::path::{Path, PathBuf};
+
+#[derive(Default, Debug, Deserialize)]
+pub struct Configuration {
+    pub default_base_image: Option<PathBuf>,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum ConfigurationError {
+    #[error(transparent)]
+    IoError(#[from] std::io::Error),
+
+    #[error(transparent)]
+    YamlError(#[from] serde_yaml::Error),
+}
+
+impl Configuration {
+    pub fn from_file(filename: &Path) -> Result<Self, ConfigurationError> {
+        if filename.exists() {
+            debug!("reading configuration file {}", filename.display());
+            let config = fs::read(filename)?;
+            let config: Configuration = serde_yaml::from_slice(&config)?;
+            debug!("config: {:#?}", config);
+            Ok(config)
+        } else {
+            Ok(Self::default())
+        }
+    }
+}