feat: support role args (#69)

* feat: support role args

We can use role args to pass some additional arguments to the prompt.

```
- name: convert:json:yaml
  prompt: convert __ARG1__ below to __ARG2__
```

`:json:yaml` is `role args`. It has two args:

- arg1 `json`, it will replace __ARG1__ in prompt
- arg2 `yaml`, it will replace __ARG2__ in prompt

```
〉.role convert:json:yaml
name: convert:json:yaml
prompt: convert json below to yaml
temperature: null

〉.role convert:yaml:json
name: convert:yaml:json
prompt: convert yaml below to json
temperature: null
```

different role args,  will generate different prompts.

* small updates

1 files changed, 3 insertions, 2 deletions

diff --git a/src/config/mod.rs b/src/config/mod.rs
index a37140c..569e434 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -120,7 +120,7 @@ impl Config {
     }
 
     pub fn find_role(&self, name: &str) -> Option<Role> {
-        self.roles.iter().find(|v| v.name == name).cloned()
+        self.roles.iter().find(|v| v.match_name(name)).cloned()
     }
 
     pub fn config_dir() -> Result<PathBuf> {
@@ -200,7 +200,8 @@ impl Config {
 
     pub fn change_role(&mut self, name: &str) -> Result<String> {
         match self.find_role(name) {
-            Some(role) => {
+            Some(mut role) => {
+                role.complete_prompt_args(name);
                 if let Some(conversation) = self.conversation.as_mut() {
                     conversation.update_role(&role)?;
                 }