FEAT: Add rule: man no space (#120)

src/rules/man_no_space.rs

@@ -0,0 +1,54 @@
+use super::Rule;
+use crate::{cli::command::CrabCommand, shell::Shell};
+
+pub fn match_rule(command: &mut CrabCommand, system_shell: Option<&dyn Shell>) -> bool {
+    if let Some(output) = &command.output {
+        command.script.starts_with("man") && output.contains("command not found")
+    } else {
+        false
+    }
+}
+
+pub fn get_new_command(command: &mut CrabCommand, system_shell: Option<&dyn Shell>) -> Vec<String> {
+    vec![format!("man {}", &command.script[3..])]
+}
+
+pub fn get_rule() -> Rule {
+    Rule::new(
+        "man_no_space".to_owned(),
+        None,
+        Some(2000),
+        None,
+        match_rule,
+        get_new_command,
+        None,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{get_new_command, match_rule};
+    use crate::cli::command::CrabCommand;
+    use crate::shell::Bash;
+    use rstest::rstest;
+
+    #[rstest]
+    #[case("mandiff", "mandiff: command not found", true)]
+    #[case("", "", false)]
+    fn test_match(#[case] command: &str, #[case] stdout: &str, #[case] is_match: bool) {
+        let mut command = CrabCommand::new(command.to_owned(), Some(stdout.to_owned()), None);
+        assert_eq!(match_rule(&mut command, None), is_match);
+    }
+
+    #[rstest]
+    #[case("mandiff", "", vec!["man diff"])]
+    fn test_get_new_command(
+        #[case] command: &str,
+        #[case] stdout: &str,
+        #[case] expected: Vec<&str>,
+    ) {
+        let system_shell = Bash {};
+        let mut command = CrabCommand::new(command.to_owned(), Some(stdout.to_owned()), None);
+        assert_eq!(get_new_command(&mut command, None), expected);
+    }
+}

src/rules/mod.rs

@@ -74,6 +74,7 @@ mod long_form_help;
 mod ls_all;
 mod ls_lah;
 mod man;
+mod man_no_space;
 mod mkdir_p;
 mod no_command;
 mod python_command;
@@ -157,6 +158,7 @@ pub fn get_rules() -> Vec<Rule> {
         ls_all::get_rule(),
         ls_lah::get_rule(),
         man::get_rule(),
+        man_no_space::get_rule(),
         mkdir_p::get_rule(),
         no_command::get_rule(),
         python_command::get_rule(),