fix: add validation when passing --inline-toc

feat: add coloring when displaying CLI errors

src/cli.rs

@@ -119,7 +119,17 @@ impl<'a> TryFrom<ArgMatches<'a>> for AppConfig {
                 4..=u64::MAX => LogLevel::Debug,
             })
             .is_logging_to_file(arg_matches.is_present("log-to-file"))
-            .inline_toc(arg_matches.is_present("inline-toc"))
+            .inline_toc(
+                (if arg_matches.is_present("inline-toc") {
+                    if arg_matches.value_of("export") == Some("epub") {
+                        Ok(true)
+                    } else {
+                        Err(Error::WrongExportInliningToC)
+                    }
+                } else {
+                    Ok(false)
+                })?,
+            )
             .output_directory(
                 arg_matches
                     .value_of("output_directory")

src/errors.rs

@@ -156,4 +156,6 @@ pub enum CliError<BuilderError: Debug + Display> {
     OutputDirectoryNotExists,
     #[error("Unable to start logger!\n{0}")]
     LogError(#[from] LogError),
+    #[error("The --inline-toc can only be used exporting to epub")]
+    WrongExportInliningToC,
 }

src/main.rs

@@ -3,6 +3,7 @@ extern crate lazy_static;
 
 use std::process::exit;
 
+use colored::Colorize;
 use comfy_table::presets::{UTF8_FULL, UTF8_HORIZONTAL_BORDERS_ONLY};
 use comfy_table::{ContentArrangement, Table};
 use http::download;
@@ -28,7 +29,7 @@ fn main() {
     let app_config = match cli::AppConfig::init_with_cli() {
         Ok(app_config) => app_config,
         Err(err) => {
-            eprintln!("{}", err);
+            eprintln!("{}: {}", "ERROR".bold().bright_red(), err);
             exit(1);
         }
     };