From beb4a5a27862e2261c3a12257aae23990ae52a39 Mon Sep 17 00:00:00 2001
From: Daniel Silverstone <dsilvers@digital-scurf.org>
Date: Fri, 9 Apr 2021 18:09:19 +0100
Subject: subplot: Add initial Codegen code into binary

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
---
 src/bin/subplot.rs | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 62 insertions(+), 2 deletions(-)

diff --git a/src/bin/subplot.rs b/src/bin/subplot.rs
index 6e1945d..ebbdec8 100644
--- a/src/bin/subplot.rs
+++ b/src/bin/subplot.rs
@@ -5,14 +5,14 @@ use anyhow::Result;
 
 use chrono::{Local, TimeZone};
 use structopt::StructOpt;
-use subplot::{resource, DataFile, Document, Style};
+use subplot::{generate_test_program, resource, template_spec, DataFile, Document, Style};
 
 use std::convert::TryFrom;
 use std::ffi::OsString;
 use std::fs::{self, write, File};
 use std::io::{Read, Write};
 use std::path::{Path, PathBuf};
-use std::process;
+use std::process::{self, Command};
 use std::time::UNIX_EPOCH;
 
 mod cli;
@@ -38,6 +38,7 @@ enum Cmd {
     Filter(Filter),
     Metadata(Metadata),
     Docgen(Docgen),
+    Codegen(Codegen),
 }
 
 impl Cmd {
@@ -47,6 +48,7 @@ impl Cmd {
             Cmd::Filter(f) => f.run(),
             Cmd::Metadata(m) => m.run(),
             Cmd::Docgen(d) => d.run(),
+            Cmd::Codegen(c) => c.run(),
         }
     }
 }
@@ -276,6 +278,64 @@ impl Docgen {
     }
 }
 
+#[derive(Debug, StructOpt)]
+/// Generate test suites from Subplot documents
+///
+/// This reads a subplot document, extracts the scenarios, and writes out a test
+/// program capable of running the scenarios in the subplot document.
+struct Codegen {
+    /// Input filename.
+    #[structopt(parse(from_os_str))]
+    filename: PathBuf,
+
+    /// Write generated test program to this file.
+    #[structopt(
+        long,
+        short,
+        parse(from_os_str),
+        help = "Writes generated test program to FILE"
+    )]
+    output: PathBuf,
+
+    /// Run the generated test program after writing it?
+    #[structopt(long, short, help = "Runs generated test program")]
+    run: bool,
+}
+
+impl Codegen {
+    fn run(&self) -> Result<()> {
+        let mut doc = cli::load_document(&self.filename, Style::default())?;
+        doc.lint()?;
+        if !doc.check_named_files_exist()? {
+            eprintln!("Unable to continue");
+            std::process::exit(1);
+        }
+
+        let spec = template_spec(&doc)?;
+        generate_test_program(&mut doc, &spec, &self.output)?;
+
+        if self.run {
+            let run = match spec.run() {
+                None => {
+                    eprintln!(
+                        "Template {} does not specify how to run suites",
+                        spec.template_filename().display()
+                    );
+                    std::process::exit(1);
+                }
+                Some(x) => x,
+            };
+
+            let status = Command::new(run).arg(&self.output).status()?;
+            if !status.success() {
+                eprintln!("Test suite failed!");
+                std::process::exit(2);
+            }
+        }
+        Ok(())
+    }
+}
+
 fn main() {
     let args = Toplevel::from_args();
     args.resources.handle();
-- 
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