feat(trycmd): Ignore at the bin level

This would allow a markdown code fence to interpserse supported and
unsupported commands without having to put a `? skipped`

schema.json

@@ -101,6 +101,12 @@
     "Bin": {
       "description": "Target under test",
       "oneOf": [
+        {
+          "type": "string",
+          "enum": [
+            "ignore"
+          ]
+        },
         {
           "type": "object",
           "required": [

src/registry.rs

@@ -36,6 +36,7 @@ impl BinRegistry {
                 let bin = self.resolve_name(&name);
                 Ok(bin)
             }
+            crate::schema::Bin::Ignore => Ok(crate::schema::Bin::Ignore),
             crate::schema::Bin::Error(err) => Err(err),
         }
     }

src/runner.rs

@@ -321,6 +321,19 @@ impl Case {
             return Ok(output);
         }
 
+        match &step.bin {
+            // Will be handled by `Step::to_command`
+            Some(crate::schema::Bin::Path(_))
+            | Some(crate::schema::Bin::Name(_))
+            | Some(crate::schema::Bin::Error(_))
+            | None => {}
+            Some(crate::schema::Bin::Ignore) => {
+                // Unhandled by resolve
+                assert_eq!(output.spawn.status, SpawnStatus::Skipped);
+                return Ok(output);
+            }
+        }
+
         let cmd = step.to_command(cwd).map_err(|e| output.clone().error(e))?;
         let cmd_output = cmd
             .output()

src/schema.rs

@@ -448,6 +448,7 @@ impl Step {
         let bin = match &self.bin {
             Some(Bin::Path(path)) => Ok(path.clone()),
             Some(Bin::Name(name)) => Err(format!("Unknown bin.name = {}", name).into()),
+            Some(Bin::Ignore) => Err("Internal error: tried to run an ignored bin".into()),
             Some(Bin::Error(err)) => Err(err.clone()),
             None => Err("No bin specified".into()),
         }?;
@@ -683,6 +684,7 @@ impl Env {
 pub enum Bin {
     Path(std::path::PathBuf),
     Name(String),
+    Ignore,
     #[serde(skip)]
     Error(crate::Error),
 }

tests/cli_tests.rs

@@ -21,4 +21,5 @@ fn cli_tests() {
         t.skip("tests/cmd/timeout.toml");
     }
     t.extend_vars([("[EXAMPLE]", "example")]).unwrap();
+    t.register_bin("ignored-bin", trycmd::schema::Bin::Ignore);
 }

tests/cmd/ignored_bin.trycmd

@@ -0,0 +1,6 @@
+Ignored by test runner:
+```
+$ ignored-bin I have No Impact
+I'm ignored too
+
+```