include and use clap only if needed

Signed-off-by: Dmitry Savintsev <dsavints@gmail.com>

cargo-generate.toml

@@ -73,3 +73,6 @@ regex = "^[a-z_]+$"
 type = "string"
 prompt = "Which lsm hook? (e.g file_open, task_alloc) You can find a list of hooks in include/linux/lsm_hooks.h in the kernel source tree."
 regex = "^[a-z_]+$"
+
+[hooks]
+pre = ["pre-script.rhai"]

pre-script.rhai

@@ -0,0 +1,2 @@
+let program_types_with_opts = ["classifier", "cgroup_skb", "cgroup_sockopt", "cgroup_sysctl",  "sock_ops", "uprobe", "uretprobe", "xdp"];
+variable::set("program_types_with_opts", program_types_with_opts);

{{project-name}}-common/src/lib.rs

@@ -12,4 +12,4 @@ pub struct SockKey {
 
 #[cfg(feature = "user")]
 unsafe impl aya::Pod for SockKey {}
-{%- endif -%}
+{%- endif %}

{{project-name}}/Cargo.toml

@@ -6,10 +6,12 @@ publish = false
 
 [dependencies]
 aya = { version = ">=0.11", features=["async_tokio"] }
+{% if program_types_with_opts contains program_type -%}
+clap = { version = "4.0", features = ["derive"] }
+{% endif -%}
 aya-log = "0.1"
 {{project-name}}-common = { path = "../{{project-name}}-common", features=["user"] }
 anyhow = "1.0.42"
-clap = { version = "4.0", features = ["derive"] }
 env_logger = "0.10"
 {%- if program_type == "uprobe" %}
 libc = "0.2"

{{project-name}}/src/main.rs

@@ -1,4 +1,3 @@
-use aya::{include_bytes_aligned, Bpf};
 {% case program_type -%}
 {%- when "kprobe", "kretprobe" -%}
 use aya::programs::KProbe;
@@ -41,38 +40,35 @@ use aya::programs::SocketFilter;
 {%- when "raw_tracepoint" -%}
 use aya::programs::RawTracePoint;
 {%- endcase %}
+use aya::{include_bytes_aligned, Bpf};
 use aya_log::BpfLogger;
+{% if program_types_with_opts contains program_type -%}
 use clap::Parser;
+{% endif -%}
 use log::{info, warn};
 use tokio::signal;
 
-{% case program_type %}
+{% if program_types_with_opts contains program_type -%}
-{%- when
-    "xdp", "classifier", "sock_ops", "cgroup_skb", "cgroup_sysctl", "cgroup_sockopt", "uprobe", "uretprobe" -%}
 #[derive(Debug, Parser)]
 struct Opt {
-    {% if program_type == "xdp" or program_type == "classifier" -%}
+{%- if program_type == "xdp" or program_type == "classifier" %}
     #[clap(short, long, default_value = "eth0")]
     iface: String,
-    {%- elsif program_type == "sock_ops" or program_type == "cgroup_skb" or program_type == "cgroup_sysctl" or program_type == "cgroup_sockopt" -%}
+{% elsif program_type == "sock_ops" or program_type == "cgroup_skb" or program_type == "cgroup_sysctl" or program_type == "cgroup_sockopt" %}
     #[clap(short, long, default_value = "/sys/fs/cgroup/unified")]
     cgroup_path: String,
-    {%- elsif program_type == "uprobe" or program_type == "uretprobe" -%}
+{% elsif program_type == "uprobe" or program_type == "uretprobe" %}
     #[clap(short, long)]
     pid: Option<i32>
-    {%- endif %}
+{% endif -%}
 }
-{%- endcase %}
 
+{% endif -%}
 #[tokio::main]
 async fn main() -> Result<(), anyhow::Error> {
-    {% case program_type %}
+{%- if program_types_with_opts contains program_type %}
-    {%- when
-        "xdp", "classifier", "sock_ops", "cgroup_skb", "cgroup_sysctl", "cgroup_sockopt", "uprobe", "uretprobe" -%}
     let opt = Opt::parse();
-
+{% endif %}
-    {%- endcase %}
-
     env_logger::init();
 
     // This will include your eBPF object file as raw bytes at compile-time and load it at