Use built to determine version information

cli/src/invocation/cmd/version.rs

@@ -1,13 +1,18 @@
+use crate::built_info;
 use termcolor::{ColorSpec, WriteColor};
 
 pub(crate) fn execute<W: WriteColor>(w: &mut W) -> Result<(), crate::Error> {
     write!(w, "TaskChampion ")?;
     w.set_color(ColorSpec::new().set_bold(true))?;
-    write!(w, "{}", env!("CARGO_PKG_VERSION"))?;
+    write!(w, "{}", built_info::PKG_VERSION)?;
     w.reset()?;
 
-    if let Some(h) = option_env!("TC_GIT_REV") {
-        write!(w, " (git rev: {})", h)?;
+    if let (Some(version), Some(dirty)) = (built_info::GIT_VERSION, built_info::GIT_DIRTY) {
+        if dirty {
+            write!(w, " (git version: {} with un-committed changes)", version)?;
+        } else {
+            write!(w, " (git version: {})", version)?;
+        };
     }
     writeln!(w)?;
     Ok(())