Add rendering.roman_numerals option

Cargo.toml

@@ -55,6 +55,7 @@ crowbook-intl-runtime = "0.1"
 caribon = { version = "0.7", optional = true }
 clap = { version = "2", optional = true }
 url =  { version = "1", optional = true }
+numerals = "0.1"
 
 [dependencies.hyper]
 version = "0.9"

guide.book

@@ -33,6 +33,7 @@ rendering.num_depth: 2
 rendering.initials: false
 rendering.inline_toc: false
 rendering.chapter_template: "{{{number}}}\\. {{{chapter_title}}}"
+rendering.roman_numerals: true
 
 # Html options
 html.icon: crowbook.svg

src/lib/book.rs

@@ -19,7 +19,6 @@ use error::{Error, Result, Source};
 use cleaner::{Cleaner, CleanerParams, French, Off, Default};
 use bookoptions::BookOptions;
 use parser::Parser;
-use token::Token;
 use epub::{Epub};
 use html_single::{HtmlSingle, ProofHtmlSingle};
 use html_dir::{HtmlDir, ProofHtmlDir};
@@ -58,7 +57,7 @@ use crossbeam;
 use mustache;
 use mustache::{MapBuilder, Template};
 use yaml_rust::{YamlLoader, Yaml};
-
+use numerals::roman::Roman;
 
 /// A Book.
 ///
@@ -911,8 +910,18 @@ impl Book {
         if !title.is_empty() {
             data = data.insert_bool("has_chapter_title", true);
         }
+        let number = if self.options.get_bool("rendering.roman_numerals").unwrap() == true {
+            if n <= 0 {
+                return Err(Error::render(Source::empty(),
+                                            lformat!("can not use roman numerals with zero or negative chapter numbers ({n})",
+                                                     n = n)));
+            }
+            format!("{:X}", Roman::from(n as i16))
+        } else {
+            format!("{}", n)
+        };
         data = data.insert_str("chapter_title", title)
-            .insert_str("number", format!("{}", n));
+            .insert_str("number", number);
 
         let data = data.build();
         let mut res: Vec<u8> = vec![];

src/lib/bookoptions.rs

@@ -38,6 +38,7 @@ rendering.inline_toc:bool:false                                      # {inline_t
 rendering.inline_toc.name:str:\"{{{{{{loc_toc}}}}}}\"                        # {toc_name}
 rendering.num_depth:int:1                                            # {num_depth}
 rendering.chapter_template:str:\"{{{{{{number}}}}}}\\\\. {{{{{{chapter_title}}}}}}\" # {chapter_template}
+rendering.roman_numerals:bool:false                                  # {roman_numerals}
 
 # {special_ops}
 import_config:path                  # {import_config}
@@ -195,6 +196,7 @@ html.crowbook_link:alias                            # {removed}
                                          toc_name = lformat!("Name of the table of contents if it is displayed in document"),
                                          num_depth = lformat!("The  maximum heading levels that should be numbered (0: no numbering, 1: only chapters, ..., 6: all)"),
                                          chapter_template = lformat!("Naming scheme of chapters"),
+                                         roman_numerals = lformat!("If set to true, display chapter number with roman numeral"),
                                          
                                          import_config = lformat!("Import another book configuration file"),
 

src/lib/lib.rs

@@ -116,6 +116,7 @@ extern crate crossbeam;
 extern crate crowbook_text_processing;
 extern crate crowbook_intl_runtime;
 extern crate term;
+extern crate numerals;
 #[macro_use]
 extern crate lazy_static;