fix: fix vergen output in component template

[JayanAXHF]

Closes #130

[JayanAXHF]

I've tested this workaround on my project and it works!

[JayanAXHF]

This is probably because of just-generate

[orhun]

Any idea when 10.0.0 is going to be out? I'm a bit hesitant about including a beta dependency in a template

Alsol, I was under the impression that there should be a simpler fix for this. e.g. if VERGEN_GIT_DESCRIBE is not available, we use another string for the version message.

[JayanAXHF]

Any idea when 10.0.0 is going to be out? I'm a bit hesitant about including a beta dependency in a template

Understandable, i'm currently unaware of a planned release timeline, so we could keep this PR here until it stablises.

Alsol, I was under the impression that there should be a simpler fix for this. e.g. if VERGEN_GIT_DESCRIBE is not available, we use another string for the version message.

The problem is that we can't use any VERGEN_GIT_* strings, we'd have to rely on the cargo version and build info for a good version string.

[orhun]

We could maybe use option_env like this?

diff --git a/component-generated/src/cli.rs b/component-generated/src/cli.rs
index 8696a0a..336a864 100644
--- a/component-generated/src/cli.rs
+++ b/component-generated/src/cli.rs
@@ -14,14 +14,17 @@ pub struct Cli {
     pub frame_rate: f64,
 }
 
-const VERSION_MESSAGE: &str = concat!(
-    env!("CARGO_PKG_VERSION"),
-    "-",
-    env!("VERGEN_GIT_DESCRIBE"),
-    " (",
-    env!("VERGEN_BUILD_DATE"),
-    ")"
-);
+fn version_message() -> String {
+    let git_describe = option_env!("VERGEN_GIT_DESCRIBE")
+        .map(|describe| format!("-{describe}"))
+        .unwrap_or_default();
+    format!(
+        "{}{} ({})",
+        env!("CARGO_PKG_VERSION"),
+        git_describe,
+        env!("VERGEN_BUILD_DATE")
+    )
+}
 
 pub fn version() -> String {
     let author = clap::crate_authors!();
@@ -32,11 +35,12 @@ pub fn version() -> String {
 
     format!(
         "\
-{VERSION_MESSAGE}
+{}
 
 Authors: {author}
 
 Config directory: {config_dir_path}
-Data directory: {data_dir_path}"
+Data directory: {data_dir_path}",
+        version_message()
     )
 }