fix(changelog): limit lines in changelog to default of 80 characters …

…to address markdownlint issue MD013

Refs: #20

src/cmd/changelog.rs

@@ -70,8 +70,8 @@ impl<'a> ChangeLogTransformer<'a> {
             commit_parser,
         })
     }
-
     fn make_notes(&self, footers: &'a [Footer], scope: Option<String>) -> Vec<(String, Note)> {
+        let changelog_line_length = self.config.changelog_line_length ;
         footers
             .iter()
             .filter(|footer| footer.key.starts_with("BREAKING"))
@@ -80,7 +80,23 @@ impl<'a> ChangeLogTransformer<'a> {
                     footer.key.clone(),
                     Note {
                         scope: scope.clone(),
-                        text: footer.value.clone(),
+                        text: footer.value.to_owned()
+                        .split_whitespace()
+                        .map(|s| String::from(s))
+                        .fold(Vec::<String>::new(), |mut acc, word|{
+                            let length=acc.len();
+                            if length != 0 {
+                                let last_line = acc.clone().pop().unwrap();
+                                if last_line.len() + word.len() < changelog_line_length {
+                                    acc[length -1] = format!("{} {}", last_line,word);
+                                }else{
+                                    acc.push(word);
+                                }
+                            }else{
+                                acc.push(word);
+                            }
+                            acc
+                        }),
                     },
                 )
             })
@@ -132,7 +148,23 @@ impl<'a> ChangeLogTransformer<'a> {
                 let hash = commit.id().to_string();
                 let date = chrono::NaiveDateTime::from_timestamp(commit.time().seconds(), 0).date();
                 let scope = conv_commit.scope;
-                let subject = conv_commit.description;
+                let subject = conv_commit.description.to_owned()
+                .split_whitespace()
+                .map(|s| String::from(s))
+                .fold(Vec::<String>::new(), |mut acc, word|{
+                    let length=acc.len();
+                    if length != 0 {
+                        let last_line = acc.clone().pop().unwrap();
+                        if last_line.len() + word.len() < self.config.changelog_line_length {
+                            acc[length -1] = format!("{} {}", last_line,word);
+                        }else{
+                            acc.push(word);
+                        }
+                    }else{
+                        acc.push(word);
+                    }
+                    acc
+                });
                 let body = conv_commit.body;
                 let short_hash = hash[..7].into();
                 let mut references = Vec::new();

src/conventional/changelog.rs

@@ -25,7 +25,7 @@ pub(crate) struct Reference<'a> {
 #[derive(Debug, Serialize)]
 pub(crate) struct Note {
     pub(crate) scope: Option<String>,
-    pub(crate) text: String,
+    pub(crate) text: Vec<String>,
 }
 
 #[derive(Debug, Serialize)]
@@ -39,7 +39,7 @@ pub(crate) struct NoteGroup {
 pub(crate) struct CommitContext<'a> {
     pub(crate) hash: String,
     pub(crate) date: NaiveDate,
-    pub(crate) subject: String,
+    pub(crate) subject: Vec<String>,
     pub(crate) body: Option<String>,
     pub(crate) scope: Option<String>,
     pub(crate) short_hash: String,
@@ -159,4 +159,4 @@ impl<W: io::Write> ChangelogWriter<W> {
             .render_to_write("template", context, writer)?;
         Ok(())
     }
-}
+}

src/conventional/changelog/commit.hbs

@@ -1,4 +1,5 @@
-*{{#if scope}} **{{scope}}:**{{/if}} {{#if subject}}{{subject}}{{else}}{{header}}{{/if}}
+*{{#if scope}} **{{scope}}:**{{/if}} {{#if subject}}{{#each subject}}{{this}}
+{{/each}}{{else}}{{header}}{{/if}}
 {{~#if hash}}
   {{~#if @root.linkReferences}} ([{{shortHash}}]({{commitUrlFormat}}))
   {{~else}} {{shortHash}}{{/if}}

src/conventional/changelog/template.hbs

@@ -1,8 +1,10 @@
 {{> header}}
 {{#if noteGroups}}{{#each noteGroups}}
-### ⚠ ||{{title}}||
+### ⚠ {{title}}
 
-{{#each notes}}* {{#if commit.scope}}**{{commit.scope}}:** {{/if}}{{text}}{{/each}}
+{{#each notes}}* {{#if commit.scope}}**{{commit.scope}}:** {{/if}}{{#each text}}{{this}}
+{{/each}}
+{{/each}}
 {{/each}}
 {{/if}}
 

src/conventional/config.rs

@@ -67,6 +67,10 @@ pub(crate) struct Config {
     /// Defaults to `"[[:alnum:]]+(?:[-_/][[:alnum:]]+)*"`.
     #[serde(default = "default_scope_regex")]
     pub(crate) scope_regex: String,
+    /// default number of characters in a single line of the CHANGELOG.
+    #[serde(default = "default_changelog_line_length")]
+    pub(crate) changelog_line_length: usize,
+
 }
 
 impl Default for Config {
@@ -81,6 +85,7 @@ impl Default for Config {
             user_url_format: default_user_url_format(),
             release_commit_message_format: default_release_commit_message_format(),
             issue_prefixes: default_issue_prefixes(),
+            changelog_line_length: default_changelog_line_length(),
             host: None,
             owner: None,
             repository: None,
@@ -168,6 +173,11 @@ fn default_user_url_format() -> String {
 fn default_release_commit_message_format() -> String {
     "chore(release): {{currentTag}}".into()
 }
+fn default_changelog_line_length() -> usize {
+    80
+}
+
+
 
 fn default_issue_prefixes() -> Vec<String> {
     vec!["#".into()]
@@ -255,6 +265,7 @@ mod tests {
         assert_eq!(
             value,
             Config {
+                changelog_line_length: 80,
                 header: "# Changelog\n".to_string(),
                 types: vec![
                     Type {