feat: add link_parsing

Closes #41

README.md

@@ -330,7 +330,7 @@ This minimal example creates artifacts that can be used on another job.
         - CHANGELOG.md
 ```
 
-Please note that the stage is `doc` and has to be changed accordingly to your need. 
+Please note that the stage is `doc` and has to be changed accordingly to your need.
 
 ## Configuration File
 
@@ -406,6 +406,10 @@ skip_tags = "v0.1.0-beta.1"
 ignore_tags = ""
 topo_order = false
 sort_commits = "oldest"
+link_parsers = [
+    { pattern = "#(\\d+)", href = "https://github.com/orhun/git-cliff/issues/$1"},
+    { pattern = "RFC(\\d+)", replace = "https://datatracker.ietf.org/doc/html/rfc$1"},
+]
 ```
 
 #### conventional_commits
@@ -513,6 +517,17 @@ Possible values:
 
 This can also be achieved by specifying the `--sort` command line argument.
 
+#### link_parsers
+
+An array of link parsers for extracting external references, and turning them into URLs, using regex.
+
+Examples:
+
+- `{ pattern = "#(\\d+)", href = "https://github.com/orhun/git-cliff/issues/$1"}`
+  - Extract all gitlab issues and PRs and generate URLs linking to them.
+- `{ pattern = "RFC(\\d+)", replace = "https://datatracker.ietf.org/doc/html/rfc$1"}`
+  - Extract mentiones of IETF RFCs and generate URLs linking to them.
+
 ## Templating
 
 A template is a text where variables and expressions get replaced with values when it is rendered.
@@ -550,7 +565,8 @@ following context is generated to use for templating:
       "footers": ["[footer]", "[footer]"],
       "breaking_description": "<description>",
       "breaking": false,
-      "conventional": true
+      "conventional": true,
+      "links": [{"text": "[text]", "href": "[href]"}]
     }
   ],
   "commit_id": "a440c6eb26404be4877b7e3ad592bfaa5d4eb210 (release commit)",
@@ -595,6 +611,7 @@ If [conventional_commits](#conventional_commits) is set to `false`, then some of
       "scope": "(overrided by commit_parsers)",
       "message": "(full commit message including description, footers, etc.)",
       "conventional": false,
+      "links": [{"text": "[text]", "href": "[href]"}]
     }
   ],
   "commit_id": "a440c6eb26404be4877b7e3ad592bfaa5d4eb210 (release commit)",

git-cliff-core/src/commit.rs

@@ -1,6 +1,7 @@
 use crate::config::{
 	CommitParser,
 	GitConfig,
+	LinkParser,
 };
 use crate::error::{
 	Error as AppError,
@@ -29,6 +30,20 @@ pub struct Commit<'a> {
 	pub group:   Option<String>,
 	/// Commit scope based on conventional type or a commit parser.
 	pub scope:   Option<String>,
+	/// A list of links found in the commit
+	pub links:   Vec<Link>,
+}
+
+/// Object representing a link
+#[derive(
+	Debug, Clone, PartialEq, serde_derive::Deserialize, serde_derive::Serialize,
+)]
+#[serde(rename_all = "camelCase")]
+pub struct Link {
+	/// Text of the link.
+	pub text: String,
+	/// URL of the link
+	pub href: String,
 }
 
 impl<'a> From<&GitCommit<'a>> for Commit<'a> {
@@ -49,13 +64,15 @@ impl Commit<'_> {
 			conv: None,
 			group: None,
 			scope: None,
+			links: vec![],
 		}
 	}
 
 	/// Processes the commit.
 	///
 	/// * converts commit to a conventional commit
 	/// * sets the group for the commit
+	/// * extacts links and generates URLs
 	pub fn process(&self, config: &GitConfig) -> Result<Self> {
 		let mut commit = self.clone();
 		if config.conventional_commits {
@@ -69,6 +86,9 @@ impl Commit<'_> {
 			commit =
 				commit.parse(parsers, config.filter_commits.unwrap_or(false))?;
 		}
+		if let Some(parsers) = &config.link_parsers {
+			commit = commit.parse_links(parsers)?;
+		}
 		Ok(commit)
 	}
 
@@ -118,6 +138,27 @@ impl Commit<'_> {
 			)))
 		}
 	}
+
+	/// Parses the commit using [`LinkParser`]s.
+	///
+	/// Sets the [`links`] of the commit.
+	///
+	/// [`links`]: Commit::links
+	pub fn parse_links(mut self, parsers: &[LinkParser]) -> Result<Self> {
+		for parser in parsers {
+			let regex = &parser.pattern;
+			let replace = &parser.href;
+			for mat in regex.find_iter(&self.message) {
+				let text = mat.as_str();
+				let href = regex.replace(text, replace);
+				self.links.push(Link {
+					text: text.to_string(),
+					href: href.to_string(),
+				});
+			}
+		}
+		Ok(self)
+	}
 }
 
 impl Serialize for Commit<'_> {
@@ -163,6 +204,7 @@ impl Serialize for Commit<'_> {
 				commit.serialize_field("scope", &self.scope)?;
 			}
 		}
+		commit.serialize_field("links", &self.links)?;
 		commit.serialize_field("conventional", &self.conv.is_some())?;
 		commit.end()
 	}
@@ -207,4 +249,58 @@ mod test {
 		assert_eq!(Some(String::from("test_group")), commit.group);
 		assert_eq!(Some(String::from("test_scope")), commit.scope);
 	}
+
+	#[test]
+	fn parse_link() {
+		let test_cases = vec![
+			(
+				Commit::new(
+					String::from("123123"),
+					String::from("test(commit): add test\n\nBody with issue #123"),
+				),
+				true,
+			),
+			(
+				Commit::new(
+					String::from("123123"),
+					String::from(
+						"test(commit): add test\n\nImlement RFC456\n\nFixes: #456",
+					),
+				),
+				true,
+			),
+		];
+		for (commit, is_conventional) in &test_cases {
+			assert_eq!(is_conventional, &commit.clone().into_conventional().is_ok())
+		}
+		let commit = Commit::new(
+			String::from("123123"),
+			String::from("test(commit): add test\n\nImlement RFC456\n\nFixes: #455"),
+		);
+		let commit = commit
+			.parse_links(&[
+				LinkParser {
+					pattern: Regex::new("RFC(\\d+)").unwrap(),
+					href:    String::from("rfc://$1"),
+				},
+				LinkParser {
+					pattern: Regex::new("#(\\d+)").unwrap(),
+					href:    String::from("https://github.com/$1"),
+				},
+			])
+			.unwrap();
+		assert_eq!(
+			vec![
+				Link {
+					text: String::from("RFC456"),
+					href: String::from("rfc://456"),
+				},
+				Link {
+					text: String::from("#455"),
+					href: String::from("https://github.com/455"),
+				}
+			],
+			commit.links
+		);
+	}
 }

git-cliff-core/src/config.rs

@@ -32,6 +32,8 @@ pub struct GitConfig {
 	pub filter_unconventional: Option<bool>,
 	/// Git commit parsers.
 	pub commit_parsers:        Option<Vec<CommitParser>>,
+	/// Link parsers.
+	pub link_parsers:          Option<Vec<LinkParser>>,
 	/// Whether to filter out commits.
 	pub filter_commits:        Option<bool>,
 	/// Blob pattern for git tags.
@@ -65,6 +67,16 @@ pub struct CommitParser {
 	pub skip:          Option<bool>,
 }
 
+/// Parser for extracting links in commits.
+#[derive(Debug, Clone, serde_derive::Serialize, serde_derive::Deserialize)]
+pub struct LinkParser {
+	/// Regex for finding links in the commit message.
+	#[serde(with = "serde_regex")]
+	pub pattern: Regex,
+	/// The string used to generate the link URL.
+	pub href:    String,
+}
+
 impl Config {
 	/// Parses the config file and returns the values.
 	pub fn parse(file_name: String) -> Result<Config> {

git-cliff-core/tests/integration_test.rs

@@ -3,6 +3,7 @@ use git_cliff_core::config::{
 	ChangelogConfig,
 	CommitParser,
 	GitConfig,
+	LinkParser,
 };
 use git_cliff_core::error::Result;
 use git_cliff_core::release::*;
@@ -17,19 +18,19 @@ fn generate_changelog() -> Result<()> {
 		header: Some(String::from("this is a changelog")),
 		body:   String::from(
 			r#"
-        ## Release {{ version }}
-        {% for group, commits in commits | group_by(attribute="group") %}
-        ### {{ group }}    
-        {% for commit in commits %}
-        {%- if commit.scope -%}
-        - *({{commit.scope}})* {{ commit.message }}    
-        {% else -%}
-        - {{ commit.message }}    
-        {% endif -%}
-        {% if commit.breaking -%}
-        {% raw %}  {% endraw %}- **BREAKING**: {{commit.breaking_description}}
-        {% endif -%}
-        {% endfor -%}
+## Release {{ version }}
+{% for group, commits in commits | group_by(attribute="group") %}
+### {{ group }}
+{% for commit in commits %}
+{%- if commit.scope -%}
+- *({{commit.scope}})* {{ commit.message }}{%- if commit.links %} ({% for link in commit.links %}[{{link.text}}]({{link.href}}){% endfor -%}){% endif %}
+{% else -%}
+- {{ commit.message }}
+{% endif -%}
+{% if commit.breaking -%}
+{% raw %}  {% endraw %}- **BREAKING**: {{commit.breaking_description}}
+{% endif -%}
+{% endfor -%}
 {% endfor %}"#,
 		),
 		footer: Some(String::from("eoc - end of changelog")),
@@ -60,6 +61,10 @@ fn generate_changelog() -> Result<()> {
 		ignore_tags:           None,
 		topo_order:            None,
 		sort_commits:          None,
+		link_parsers:          Some(vec![LinkParser {
+			pattern: Regex::new("#(\\d+)").unwrap(),
+			href:    String::from("https://github.com/$1"),
+		}]),
 	};
 
 	let releases = vec![
@@ -74,7 +79,9 @@ fn generate_changelog() -> Result<()> {
 				Commit::new(String::from("abc124"), String::from("feat: add zyx")),
 				Commit::new(
 					String::from("abc124"),
-					String::from("feat(random-scope): add random feature"),
+					String::from(
+						"feat(random-scope): add random feature\n\nCloses #123",
+					),
 				),
 				Commit::new(String::from("def789"), String::from("invalid commit")),
 				Commit::new(
@@ -134,32 +141,33 @@ fn generate_changelog() -> Result<()> {
 	writeln!(out, "{}", changelog_config.footer.unwrap()).unwrap();
 
 	assert_eq!(
-		"this is a changelog
+		r#"this is a changelog
 
-        ## Release v2.0.0
-        
-        ### fix bugs    
-        - fix abc    
-        
-        ### shiny features    
-        - add xyz    
-        - add zyx    
-        - *(random-scope)* add random feature    
-        - *(big-feature)* this is a breaking change    
-          - **BREAKING**: this is a breaking change
-        
-        ## Release v1.0.0
-        
-        ### chore    
-        - do nothing    
-        
-        ### feat    
-        - add cool features    
-        
-        ### fix    
-        - fix stuff    
-        - fix more stuff    
-        eoc - end of changelog\n",
+## Release v2.0.0
+
+### fix bugs
+- fix abc
+
+### shiny features
+- add xyz
+- add zyx
+- *(random-scope)* add random feature ([#123](https://github.com/123))
+- *(big-feature)* this is a breaking change
+  - **BREAKING**: this is a breaking change
+
+## Release v1.0.0
+
+### chore
+- do nothing
+
+### feat
+- add cool features
+
+### fix
+- fix stuff
+- fix more stuff
+eoc - end of changelog
+"#,
 		out
 	);
 

git-cliff/src/changelog.rs

@@ -206,6 +206,7 @@ mod test {
 				ignore_tags:           None,
 				topo_order:            Some(false),
 				sort_commits:          Some(String::from("oldest")),
+				link_parsers:          None,
 			},
 		};
 		let test_release = Release {