Reorganise functions in build script

build.rs

@@ -1,38 +1,21 @@
-// For bat-as-a-library, no build script is required. The build script is for
+use std::{collections::HashMap, fs, path::Path};
-// the manpage and completions, which are only relevant to the bat application.
-#[cfg(not(feature = "application"))]
-fn main() {}
 
-#[cfg(feature = "application")]
 fn main() -> anyhow::Result<()> {
-    use std::collections::HashMap;
+    #[cfg(feature = "application")]
-    use std::fs;
+    gen_man_and_comp()?;
-    use std::path::Path;
 
+    Ok(())
+}
+
+/// Generate manpage and shell completions for the bat application.
+#[cfg(feature = "application")]
+fn gen_man_and_comp() -> anyhow::Result<()> {
     // Read environment variables.
     let project_name = option_env!("PROJECT_NAME").unwrap_or("bat");
     let executable_name = option_env!("PROJECT_EXECUTABLE").unwrap_or(project_name);
     let executable_name_uppercase = executable_name.to_uppercase();
     static PROJECT_VERSION: &str = env!("CARGO_PKG_VERSION");
 
-    /// Generates a file from a template.
-    fn template(
-        variables: &HashMap<&str, &str>,
-        in_file: &str,
-        out_file: impl AsRef<Path>,
-    ) -> anyhow::Result<()> {
-        let mut content = fs::read_to_string(in_file)?;
-
-        for (variable_name, value) in variables {
-            // Replace {{variable_name}} by the value
-            let pattern = format!("{{{{{variable_name}}}}}", variable_name = variable_name);
-            content = content.replace(&pattern, value);
-        }
-
-        fs::write(out_file, content)?;
-        Ok(())
-    }
-
     let mut variables = HashMap::new();
     variables.insert("PROJECT_NAME", project_name);
     variables.insert("PROJECT_EXECUTABLE", executable_name);
@@ -49,27 +32,27 @@ fn main() -> anyhow::Result<()> {
     fs::create_dir_all(out_dir.join("assets/manual")).unwrap();
     fs::create_dir_all(out_dir.join("assets/completions")).unwrap();
 
-    template(
+    render_template(
         &variables,
         "assets/manual/bat.1.in",
         out_dir.join("assets/manual/bat.1"),
     )?;
-    template(
+    render_template(
         &variables,
         "assets/completions/bat.bash.in",
         out_dir.join("assets/completions/bat.bash"),
     )?;
-    template(
+    render_template(
         &variables,
         "assets/completions/bat.fish.in",
         out_dir.join("assets/completions/bat.fish"),
     )?;
-    template(
+    render_template(
         &variables,
         "assets/completions/_bat.ps1.in",
         out_dir.join("assets/completions/_bat.ps1"),
     )?;
-    template(
+    render_template(
         &variables,
         "assets/completions/bat.zsh.in",
         out_dir.join("assets/completions/bat.zsh"),
@@ -77,3 +60,22 @@ fn main() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+/// Generates a file from a template.
+#[allow(dead_code)]
+fn render_template(
+    variables: &HashMap<&str, &str>,
+    in_file: &str,
+    out_file: impl AsRef<Path>,
+) -> anyhow::Result<()> {
+    let mut content = fs::read_to_string(in_file)?;
+
+    for (variable_name, value) in variables {
+        // Replace {{variable_name}} by the value
+        let pattern = format!("{{{{{variable_name}}}}}", variable_name = variable_name);
+        content = content.replace(&pattern, value);
+    }
+
+    fs::write(out_file, content)?;
+    Ok(())
+}