8 files changed, 84 insertions, 57 deletions

diff --git a/bin/src/config.rs b/bin/src/config.rs
index 572ddde..28e6cc3 100644
--- a/bin/src/config.rs
+++ b/bin/src/config.rs
@@ -8,7 +8,7 @@ use std::{
 use crate::{dirs, err::ConfigErr, utils, LintMap};
 
 use clap::Parser;
-use lib::LINTS;
+use lib::{session::Version, LINTS};
 use serde::{Deserialize, Serialize};
 use vfs::ReadOnlyVfs;
 
@@ -29,6 +29,8 @@ pub enum SubCommand {
     Single(Single),
     /// Print detailed explanation for a lint warning
     Explain(Explain),
+    /// Dump a sample config to stdout
+    Dump(Dump),
 }
 
 #[derive(Parser, Debug)]
@@ -51,7 +53,7 @@ pub struct Check {
     pub format: OutFormat,
 
     /// Path to statix.toml
-    #[clap(short = 'c', long = "config", default_value = ".")]
+    #[clap(short = 'c', long = "config", default_value = "./statix.toml")]
     pub conf_path: PathBuf,
 
     /// Enable "streaming" mode, accept file on stdin, output diagnostics on stdout
@@ -76,10 +78,6 @@ impl Check {
             vfs(files.collect::<Vec<_>>())
         }
     }
-
-    pub fn lints(&self) -> Result<LintMap, ConfigErr> {
-        lints(&self.conf_path)
-    }
 }
 
 #[derive(Parser, Debug)]
@@ -101,7 +99,7 @@ pub struct Fix {
     pub diff_only: bool,
 
     /// Path to statix.toml
-    #[clap(short = 'c', long = "config", default_value = ".")]
+    #[clap(short = 'c', long = "config", default_value = "./statix.toml")]
     pub conf_path: PathBuf,
 
     /// Enable "streaming" mode, accept file on stdin, output diagnostics on stdout
@@ -144,10 +142,6 @@ impl Fix {
             FixOut::Write
         }
     }
-
-    pub fn lints(&self) -> Result<LintMap, ConfigErr> {
-        lints(&self.conf_path)
-    }
 }
 
 #[derive(Parser, Debug)]
@@ -167,6 +161,10 @@ pub struct Single {
     /// Enable "streaming" mode, accept file on stdin, output diagnostics on stdout
     #[clap(short, long = "stdin")]
     pub streaming: bool,
+
+    /// Path to statix.toml
+    #[clap(short = 'c', long = "config", default_value = "./statix.toml")]
+    pub conf_path: PathBuf,
 }
 
 impl Single {
@@ -204,6 +202,9 @@ pub struct Explain {
     pub target: u32,
 }
 
+#[derive(Parser, Debug)]
+pub struct Dump {}
+
 #[derive(Debug, Copy, Clone)]
 pub enum OutFormat {
     #[cfg(feature = "json")]
@@ -251,13 +252,19 @@ impl FromStr for OutFormat {
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ConfFile {
+    #[serde(default = "Vec::new")]
     disabled: Vec<String>,
+    nix_version: Option<String>,
 }
 
 impl Default for ConfFile {
     fn default() -> Self {
         let disabled = vec![];
-        Self { disabled }
+        let nix_version = Some(utils::default_nix_version());
+        Self {
+            disabled,
+            nix_version,
+        }
     }
 }
 
@@ -265,15 +272,7 @@ impl ConfFile {
     pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Self, ConfigErr> {
         let path = path.as_ref();
         let config_file = fs::read_to_string(path).map_err(ConfigErr::InvalidPath)?;
-        toml::de::from_str(&config_file).map_err(|err| {
-            let pos = err.line_col();
-            let msg = if let Some((line, col)) = pos {
-                format!("line {}, col {}", line, col)
-            } else {
-                "unknown".to_string()
-            };
-            ConfigErr::ConfFileParse(msg)
-        })
+        (toml::de::from_str(&config_file)).map_err(ConfigErr::ConfFileParse)
     }
     pub fn discover<P: AsRef<Path>>(path: P) -> Result<Self, ConfigErr> {
         let cannonical_path = fs::canonicalize(path.as_ref()).map_err(ConfigErr::InvalidPath)?;
@@ -288,6 +287,29 @@ impl ConfFile {
     pub fn dump(&self) -> String {
         toml::ser::to_string_pretty(&self).unwrap()
     }
+    pub fn lints(&self) -> LintMap {
+        utils::lint_map_of(
+            (&*LINTS)
+                .iter()
+                .filter(|l| !self.disabled.iter().any(|check| check == l.name()))
+                .cloned()
+                .collect::<Vec<_>>()
+                .as_slice(),
+        )
+    }
+    pub fn version(&self) -> Result<Version, ConfigErr> {
+        if let Some(v) = &self.nix_version {
+            v.parse::<Version>()
+                .map_err(|_| ConfigErr::ConfFileVersionParse(v.clone()))
+        } else if let Some(v) = utils::get_version_info()
+            .map(|o| o.parse::<Version>().ok())
+            .flatten()
+        {
+            Ok(v)
+        } else {
+            Ok(utils::default_nix_version().parse::<Version>().unwrap())
+        }
+    }
 }
 
 fn parse_line_col(src: &str) -> Result<(usize, usize), ConfigErr> {
@@ -328,20 +350,8 @@ fn vfs(files: Vec<PathBuf>) -> Result<ReadOnlyVfs, ConfigErr> {
             let _id = vfs.alloc_file_id(&file);
             vfs.set_file_contents(&file, data.as_bytes());
         } else {
-            println!("{} contains non-utf8 content", file.display());
+            println!("`{}` contains non-utf8 content", file.display());
         };
     }
     Ok(vfs)
 }
-
-fn lints(conf_path: &Path) -> Result<LintMap, ConfigErr> {
-    let config_file = ConfFile::discover(conf_path)?;
-    Ok(utils::lint_map_of(
-        (&*LINTS)
-            .iter()
-            .filter(|l| !config_file.disabled.iter().any(|check| check == l.name()))
-            .cloned()
-            .collect::<Vec<_>>()
-            .as_slice(),
-    ))
-}
diff --git a/bin/src/dump.rs b/bin/src/dump.rs
new file mode 100644
index 0000000..5ec3f0d
--- /dev/null
+++ b/bin/src/dump.rs
@@ -0,0 +1,7 @@
+pub mod main {
+    use crate::{config::ConfFile, err::StatixErr};
+    pub fn main() -> Result<(), StatixErr> {
+        println!("{}", ConfFile::dump(&ConfFile::default()));
+        Ok(())
+    }
+}
diff --git a/bin/src/err.rs b/bin/src/err.rs
index f44d27b..8124c1f 100644
--- a/bin/src/err.rs
+++ b/bin/src/err.rs
@@ -1,7 +1,5 @@
 use std::io;
 
-// use globset::ErrorKind;
-// use rnix::parser::ParseError;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
@@ -14,8 +12,10 @@ pub enum ConfigErr {
     InvalidPosition(String),
     #[error("unable to parse `{0}` as warning code")]
     InvalidWarningCode(String),
-    #[error("unable to parse config file, error at: `{0}`")]
-    ConfFileParse(String),
+    #[error("unable to parse config file: {0}")]
+    ConfFileParse(toml::de::Error),
+    #[error("unable to parse nix version: `{0}`")]
+    ConfFileVersionParse(String),
 }
 
 // #[derive(Error, Debug)]
diff --git a/bin/src/fix.rs b/bin/src/fix.rs
index 4b2ce0c..84186d4 100644
--- a/bin/src/fix.rs
+++ b/bin/src/fix.rs
@@ -41,22 +41,22 @@ pub mod main {
     use std::borrow::Cow;
 
     use crate::{
-        config::{Fix as FixConfig, FixOut, Single as SingleConfig},
+        config::{
+            FixOut, Single as SingleConfig, {ConfFile, Fix as FixConfig},
+        },
         err::{FixErr, StatixErr},
-        utils,
     };
 
-    use lib::session::{SessionInfo, Version};
+    use lib::session::SessionInfo;
     use similar::TextDiff;
 
     pub fn all(fix_config: FixConfig) -> Result<(), StatixErr> {
         let vfs = fix_config.vfs()?;
-        let lints = fix_config.lints()?;
+        let conf_file = ConfFile::discover(&fix_config.conf_path)?;
+
+        let lints = conf_file.lints();
+        let version = conf_file.version()?;
 
-        let version = utils::get_version_info()
-            .unwrap()
-            .parse::<Version>()
-            .unwrap();
         let session = SessionInfo::from_version(version);
 
         for entry in vfs.iter() {
@@ -102,10 +102,10 @@ pub mod main {
         let original_src = entry.contents;
         let (line, col) = single_config.position;
 
-        let version = utils::get_version_info()
-            .unwrap()
-            .parse::<Version>()
-            .unwrap();
+        let conf_file = ConfFile::discover(&single_config.conf_path)?;
+
+        let version = conf_file.version()?;
+
         let session = SessionInfo::from_version(version);
 
         match (
diff --git a/bin/src/lib.rs b/bin/src/lib.rs
index 01d3ea7..8200347 100644
--- a/bin/src/lib.rs
+++ b/bin/src/lib.rs
@@ -1,5 +1,6 @@
 pub mod config;
 pub mod dirs;
+pub mod dump;
 pub mod err;
 pub mod explain;
 pub mod fix;
diff --git a/bin/src/lint.rs b/bin/src/lint.rs
index c385007..055bb76 100644
--- a/bin/src/lint.rs
+++ b/bin/src/lint.rs
@@ -43,19 +43,22 @@ pub mod main {
     use std::io;
 
     use super::lint_with;
-    use crate::{config::Check as CheckConfig, err::StatixErr, traits::WriteDiagnostic, utils};
+    use crate::{
+        config::{Check as CheckConfig, ConfFile},
+        err::StatixErr,
+        traits::WriteDiagnostic,
+    };
 
-    use lib::session::{SessionInfo, Version};
+    use lib::session::SessionInfo;
 
     pub fn main(check_config: CheckConfig) -> Result<(), StatixErr> {
         let vfs = check_config.vfs()?;
         let mut stdout = io::stdout();
-        let lints = check_config.lints()?;
 
-        let version = utils::get_version_info()
-            .unwrap()
-            .parse::<Version>()
-            .unwrap();
+        let conf_file = ConfFile::discover(&check_config.conf_path)?;
+        let lints = conf_file.lints();
+        let version = conf_file.version()?;
+
         let session = SessionInfo::from_version(version);
 
         let lint = |vfs_entry| lint_with(vfs_entry, &lints, &session);
diff --git a/bin/src/main.rs b/bin/src/main.rs
index f504796..be79bb8 100644
--- a/bin/src/main.rs
+++ b/bin/src/main.rs
@@ -1,6 +1,7 @@
 use clap::Parser;
 use statix::{
     config::{Opts, SubCommand},
+    dump,
     err::StatixErr,
     explain, fix, lint,
 };
@@ -12,6 +13,7 @@ fn _main() -> Result<(), StatixErr> {
         SubCommand::Fix(config) => fix::main::all(config),
         SubCommand::Single(config) => fix::main::single(config),
         SubCommand::Explain(config) => explain::main::main(config),
+        SubCommand::Dump(_) => dump::main::main(),
     }
 }
 
diff --git a/bin/src/utils.rs b/bin/src/utils.rs
index a3d51b4..1adac4a 100644
--- a/bin/src/utils.rs
+++ b/bin/src/utils.rs
@@ -35,3 +35,7 @@ pub fn get_version_info() -> Option<String> {
         .nth(2)
         .map(ToOwned::to_owned)
 }
+
+pub fn default_nix_version() -> String {
+    String::from("2.4")
+}