feat: Accept config on command-line

Cargo.toml

@@ -30,6 +30,7 @@ regex = "1.0"
 lazy_static = "1.2.0"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+toml = "0.4"
 itertools = "0.8"
 unicase = "1.1"
 bstr = "0.2"

src/main.rs

@@ -2,6 +2,7 @@
 #[macro_use]
 extern crate clap;
 
+use std::io::Read;
 use std::io::Write;
 
 use structopt::StructOpt;
@@ -42,6 +43,10 @@ struct Options {
     /// Paths to check
     path: Vec<std::path::PathBuf>,
 
+    #[structopt(short = "c", long = "config")]
+    /// Custom config file
+    custom_config: Option<String>,
+
     #[structopt(long, raw(overrides_with = r#""check-filenames""#))]
     /// Skip verifying spelling in file names.
     no_check_filenames: bool,
@@ -252,6 +257,13 @@ fn run() -> Result<i32, failure::Error> {
     let options = Options::from_args().infer();
 
     let mut config = config::Config::default();
+    if let Some(path) = options.custom_config.as_ref() {
+        let mut file = std::fs::File::open(path)?;
+        let mut s = String::new();
+        file.read_to_string(&mut s)?;
+        let custom: config::Config = toml::from_str(&s)?;
+        config.update(&custom);
+    }
     config.update(&options);
 
     let mut builder = get_logging(options.verbose.log_level());