Add default_glob option to config file.

Author: bitshifter

src/main.rs

@@ -14,6 +14,8 @@ const CONFIG_FILE: &str = "codegen.json";
 struct Config {
     version: u32,
     template_root: String,
+    #[serde(default)]
+    default_glob: Option<String>,
     templates: BTreeMap<String, Template>,
 }
 
@@ -170,8 +172,8 @@ fn find_config_file() -> anyhow::Result<PathBuf> {
 #[derive(FromArgs, PartialEq, Debug)]
 /// Codegen - Generate Rust code from templates
 struct CliArgs {
-    /// output file paths (glob pattern)
-    #[argh(positional, hidden_help)]
+    /// filter output paths by glob pattern (defaults to codegen.json's "default_glob" when set)
+    #[argh(positional)]
     glob: Option<String>,
 
     /// force overwrite existing files
@@ -203,14 +205,24 @@ fn main() -> anyhow::Result<()> {
     let args: CliArgs = argh::from_env();
 
     let fmt_output = !args.nofmt;
+
+    let config_file = if let Some(ref config) = args.config {
+        config.clone()
+    } else {
+        find_config_file()?
+    };
+    let config_root = config_file.parent().unwrap_or(Path::new("."));
+    let config = Config::from_file(config_file.as_path())?;
+
     let output_path_glob = args.glob;
 
     if args.stdout && output_path_glob.is_none() {
         // TODO: What if the glob matches multiple files?
         bail!("specify a single file to output to stdout.");
     }
 
-    let glob = if let Some(ref output_path_glob) = output_path_glob {
+    let effective_glob = output_path_glob.as_ref().or(config.default_glob.as_ref());
+    let glob = if let Some(output_path_glob) = effective_glob {
         Some(
             globset::Glob::new(output_path_glob.as_str())
                 .context("failed to compile glob")?
@@ -220,14 +232,6 @@ fn main() -> anyhow::Result<()> {
         None
     };
 
-    let config_file = if let Some(ref config) = args.config {
-        config.clone()
-    } else {
-        find_config_file()?
-    };
-    let config_root = config_file.parent().unwrap_or(Path::new("."));
-    let config = Config::from_file(config_file.as_path())?;
-
     let template_path = Path::new(config_root)
         .join(&config.template_root)
         .join("**/*.rs.tera");