feat(changelog): support setting the body template via args

README.md

@@ -31,6 +31,7 @@ git-cliff [FLAGS] [OPTIONS] [RANGE]
 -p, --changelog <PATH>     Prepends entries to the given changelog file [env: CHANGELOG=]
 -o, --output <PATH>        Writes output to the given file [env: OUTPUT=]
 -t, --tag <TAG>            Sets the tag for the latest version [env: TAG=]
+-b, --body <TEMPLATE>      Sets the template for the changelog body [env: TEMPLATE=]
 -s, --strip <PART>         Strips the given parts from the changelog [possible values: header, footer, all]
 ```
 

git-cliff/src/args.rs

@@ -44,15 +44,28 @@ pub struct Opt {
 	/// Sets the tag for the latest version.
 	#[structopt(short, long, env, value_name = "TAG", allow_hyphen_values = true)]
 	pub tag:        Option<String>,
+	/// Sets the template for the changelog body.
+	#[structopt(
+		short,
+		long,
+		env = "TEMPLATE",
+		value_name = "TEMPLATE",
+		allow_hyphen_values = true
+	)]
+	pub body:       Option<String>,
 	/// Processes the commits starting from the latest tag.
 	#[structopt(short, long)]
 	pub latest:     bool,
 	/// Processes the commits that do not belong to a tag.
 	#[structopt(short, long)]
 	pub unreleased: bool,
 	/// Strips the given parts from the changelog.
-	#[structopt(short, long, value_name = "PART",
-		possible_values = &["header", "footer", "all"])]
+	#[structopt(
+		short,
+		long,
+		value_name = "PART",
+		possible_values = &["header", "footer", "all"]
+	)]
 	pub strip:      Option<String>,
 	/// Sets the commit range to process.
 	#[structopt(value_name = "RANGE")]

git-cliff/src/lib.rs

@@ -68,6 +68,9 @@ pub fn run(mut args: Opt) -> Result<()> {
 			)));
 		}
 	}
+	if let Some(template) = args.body {
+		config.changelog.body = template;
+	}
 
 	// Initialize the git repository.
 	let repository =