feat: Config builder crate

Cargo.lock

···
 version = 4
 
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···
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+ "libc",
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+ "windows-link",
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+
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+dependencies = [
+ "backtrace",
+]
 
 [[package]]
 name = "bitflags"
···
 ]
 
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···
  "r-efi",
  "wasip2",
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+
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 [[package]]
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···
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 [[package]]
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···
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+
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···
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+
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+dependencies = [
+ "miette",
+ "num",
+ "winnow 0.6.24",
+]
 
 [[package]]
 name = "libc"
···
 ]
 
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+ "cfg-if",
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+ "supports-unicode",
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+
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+
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···
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+
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···
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 [[package]]
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+
+[[package]]
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···
 ]
 
 [[package]]
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···
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 [[package]]
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···
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+
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 [[package]]
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···
 ]
 
 [[package]]
+name = "sachy-config"
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+dependencies = [
+ "facet",
+ "facet-kdl",
+ "miette",
+]
+
+[[package]]
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 dependencies = [
···
  "defmt 1.0.1",
  "embassy-time",
  "sachy-fmt",
- "winnow",
+ "winnow 0.7.14",
 ]
 
 [[package]]
···
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 [[package]]
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 [[package]]
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+
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···
  "once_cell",
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+]
+
+[[package]]
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+dependencies = [
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+ "unicode-width 0.2.2",
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 [[package]]
···
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 [[package]]
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+
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···
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+dependencies = [
+ "windows-targets 0.53.5",
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 [[package]]
···
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- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
+ "windows_i686_gnullvm 0.52.6",
+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
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+ "windows_x86_64_gnullvm 0.53.1",
+ "windows_x86_64_msvc 0.53.1",
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 [[package]]
···
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 [[package]]
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 [[package]]
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+
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+checksum = "fa7359d10048f68ab8b09fa71c3daccfb0e9b559aed648a8f95469c27057180c"
+
+[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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 [[package]]
+name = "windows_x86_64_gnu"
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+checksum = "9c3842cdd74a865a8066ab39c8a7a473c0778a3f29370b5fd6b4b9aa7df4a499"
+
+[[package]]
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+
+[[package]]
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 [[package]]
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+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.53.1"
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+checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8d71a593cc5c42ad7876e2c1fda56f314f3754c084128833e64f1345ff8a03a"
+dependencies = [
+ "memchr",
+]
 
 [[package]]
 name = "winnow"

Cargo.toml

···
 members = [
     "sachy-battery",
     "sachy-bthome",
+    "sachy-config",
     "sachy-esphome",
     "sachy-fmt",
     "sachy-fnv",

sachy-config/Cargo.toml

···
+[package]
+name = "sachy-config"
+authors.workspace = true
+edition.workspace = true
+repository.workspace = true
+license.workspace = true
+version.workspace = true
+rust-version.workspace = true
+
+[dependencies]
+facet = "0.34"
+facet-kdl = "0.34"
+miette = { version = "7", features = ["fancy"] }

sachy-config/src/lib.rs

···
+use std::io::Write;
+
+use facet::Facet;
+use facet_kdl as kdl;
+use miette::{IntoDiagnostic, Result};
+
+#[derive(Facet, Default)]
+#[facet(default)]
+pub struct ConfigDoc {
+    #[facet(kdl::child, default)]
+    pub constants: Constants,
+    #[facet(kdl::child, default)]
+    pub statics: Statics,
+}
+
+#[derive(Facet, Default)]
+#[facet(default)]
+pub struct Statics {
+    #[facet(kdl::children, default)]
+    statics: Vec<Static>,
+}
+
+#[derive(Facet, Default)]
+#[facet(default)]
+pub struct Constants {
+    #[facet(kdl::children, default)]
+    pub constants: Vec<Constant>,
+}
+
+#[derive(Facet)]
+pub struct Static {
+    #[facet(kdl::node_name)]
+    pub name: String,
+    #[facet(kdl::argument)]
+    pub value: String,
+}
+
+#[derive(Facet)]
+pub struct Constant {
+    #[facet(kdl::node_name)]
+    pub name: String,
+    #[facet(kdl::argument)]
+    pub kind: String,
+    #[facet(kdl::argument)]
+    pub value: String,
+}
+
+pub fn parse_config(config: &str) -> Result<String> {
+    let config_doc: ConfigDoc = kdl::from_str_owned(config)?;
+    let mut output = String::new();
+
+    for static_value in config_doc.statics.statics.iter() {
+        let static_output = format!(
+            "pub static {}: &str = \"{}\";\n",
+            &static_value.name, &static_value.value
+        );
+        output.push_str(&static_output);
+    }
+
+    for constant_value in config_doc.constants.constants.iter() {
+        let constant_output = format!(
+            "pub const {}: {} = {};\n",
+            &constant_value.name, &constant_value.kind, &constant_value.value,
+        );
+        output.push_str(&constant_output);
+    }
+
+    Ok(output)
+}
+
+pub fn output_config<W: Write>(config: &str, mut writer: W) -> Result<()> {
+    let output = parse_config(config)?;
+
+    writer.write_all(output.as_bytes()).into_diagnostic()?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use std::io::BufWriter;
+
+    use super::*;
+
+    #[test]
+    fn it_parses_config() -> Result<()> {
+        let input = r#"constants {
+    FIRST "u8" "2"
+    VALUE "u64" "42"
+}
+statics {
+    EXAMPLE "thing"
+}"#;
+        let expected = r#"pub static EXAMPLE: &str = "thing";
+pub const FIRST: u8 = 2;
+pub const VALUE: u64 = 42;
+"#;
+
+        let output = parse_config(input)?;
+
+        assert_eq!(&output, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_handles_only_statics() -> Result<()> {
+        let input = r#"statics {
+    EXAMPLE "thing"
+}"#;
+
+        let expected = "pub static EXAMPLE: &str = \"thing\";\n";
+
+        let output = parse_config(input)?;
+
+        assert_eq!(&output, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_handles_only_constants() -> Result<()> {
+        let input = r#"constants {
+    FIRST "u8" "42"
+}"#;
+
+        let expected = "pub const FIRST: u8 = 42;\n";
+
+        let output = parse_config(input)?;
+
+        assert_eq!(&output, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_handles_empty_config() -> Result<()> {
+        let input = r#"statics {}
+constants {}"#;
+
+        let expected = "";
+
+        let output = parse_config(input)?;
+
+        assert_eq!(&output, expected);
+
+        Ok(())
+    }
+
+    #[test]
+    fn it_outputs_to_file() -> Result<()> {
+        let input = r#"constants {
+    FIRST "u8" "2"
+    VALUE "u64" "42"
+}
+statics {
+    EXAMPLE "thing"
+}"#;
+        let expected = r#"pub static EXAMPLE: &str = "thing";
+pub const FIRST: u8 = 2;
+pub const VALUE: u64 = 42;
+"#;
+        let output: Vec<u8> = Vec::new();
+        let mut buffer = BufWriter::new(output);
+
+        output_config(input, &mut buffer)?;
+
+        assert_eq!(buffer.buffer(), expected.as_bytes());
+
+        Ok(())
+    }
+}