feat: write some cdylib code

wfassoc_exec/src/cli.rs

@@ -112,5 +112,5 @@ pub struct RequestExtCommand {
 /// This is the mechanism of clap crate.
 pub fn parse() -> Request {
     let cli = Cli::parse();
-
+    todo!()
 }

wfassoc_exec/src/manifest.rs

@@ -6,11 +6,12 @@ use toml;
 
 /// Error occurs in this module.
 #[derive(Debug, TeError)]
-#[error("{0}")]
 pub enum Error {
     /// Io error
+    #[error("IO error when reading manifest file")]
     Io(#[from] std::io::Error),
     /// Toml deserialization error
+    #[error("given TOML manifest file has bad format")]
     Toml(#[from] toml::de::Error),
 }
 

wfassoc_exec/src/runner.rs

@@ -0,0 +1,45 @@
+use crate::cli::Request;
+use thiserror::Error as TeError;
+
+/// Error occurs in this module.
+#[derive(Debug, TeError)]
+#[error("{0}")]
+pub enum Error {
+    
+}
+
+/// Result type used in this module.
+type Result<T> = std::result::Result<T, Error>;
+
+// region: Respective Runners
+
+fn run_register() -> Result<()> {
+    todo!()
+}
+
+fn run_unregister()  -> Result<()> {
+    todo!()
+}
+
+fn run_status() -> Result<()> {
+    todo!()
+}
+
+fn run_ext_link() -> Result<()> {
+    todo!()
+}
+
+fn run_ext_unlink() -> Result<()> {
+    todo!()
+}
+
+fn run_ext_list() -> Result<()> {
+    todo!()
+}
+
+
+// endregion
+
+pub fn run(request: Request) -> Result<()> {
+    todo!()
+}