Demo: missing CLI args can be filled via env vars

Cargo.toml

@@ -4,7 +4,7 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-clap = { version = "4.0.7", features = ["derive"] }
+clap = { version = "4.0.7", features = ["derive", "env"] }
 reqwest = { version = "0.11.13", features = ["json"] }
 serde = { version = "1.0.152", features = ["derive"] }
 tokio = { version = "1.24.2", features = ["macros", "rt-multi-thread"] }

src/cli.rs

@@ -3,10 +3,10 @@ use clap::{Parser, Subcommand};
 #[derive(Debug, Parser)]
 #[command(version, about, long_about = None)]
 pub struct Args {
-    #[arg(short = 'o', long = "owner")]
-    pub repo_owner: Option<String>,
-    #[arg(short = 'n', long = "repo_name")]
-    pub repo_name: Option<String>,
+    #[arg(short = 'o', long = "owner", env = "GTTOOL_OWNER")]
+    pub owner: String,
+    #[arg(short = 'r', long = "repo")]
+    pub repo: Option<String>,
 
     #[command(subcommand)]
     pub command: Commands,