Add --supported-solc-versions CLI command (paritytech#260)

### Description 

Adds `--supported-solc-versions` cli command to return a semver range of
supported `solc` versions.
Is a hack until paritytech#162 is implemented.

---------

Co-authored-by: xermicus <[email protected]>

Author: pkhry

CHANGELOG.md

@@ -8,6 +8,7 @@ Supported `polkadot-sdk` rev:`c29e72a8628835e34deb6aa7db9a78a2e4eabcee`
 
 ### Added
 - Support for solc v0.8.29
+- `--supported-solc-versions` for `resolc` binary to return a `semver` range of supported `solc` versions.
 
 ### Changed
 - Runner `resolc` using webkit is no longer supported.

crates/solidity/src/lib.rs

@@ -44,8 +44,11 @@ pub use self::solc::standard_json::output::contract::Contract as SolcStandardJso
 pub use self::solc::standard_json::output::Output as SolcStandardJsonOutput;
 pub use self::solc::version::Version as SolcVersion;
 pub use self::solc::Compiler;
+pub use self::solc::FIRST_SUPPORTED_VERSION as SolcFirstSupportedVersion;
+pub use self::solc::LAST_SUPPORTED_VERSION as SolcLastSupportedVersion;
 pub use self::version::Version as ResolcVersion;
 pub use self::warning::Warning;
+
 #[cfg(not(target_os = "emscripten"))]
 pub mod test_utils;
 pub mod tests;

crates/solidity/src/resolc/arguments.rs

@@ -19,6 +19,10 @@ pub struct Arguments {
     #[arg(long = "version")]
     pub version: bool,
 
+    /// Print supported `solc` versions and exit.
+    #[arg(long = "supported-solc-versions")]
+    pub supported_solc_versions: bool,
+
     /// Print the licence and exit.
     #[arg(long = "license")]
     pub license: bool,
@@ -171,6 +175,12 @@ impl Arguments {
             anyhow::bail!("No other options are allowed while getting the compiler version.");
         }
 
+        if self.supported_solc_versions && std::env::args().count() > 2 {
+            anyhow::bail!(
+                "No other options are allowed while getting the supported `solc` versions."
+            );
+        }
+
         #[cfg(debug_assertions)]
         if self.recursive_process_input.is_some() && !self.recursive_process {
             anyhow::bail!("--process-input can be only used when --recursive-process is given");

crates/solidity/src/resolc/main.rs

@@ -41,6 +41,16 @@ fn main_inner() -> anyhow::Result<()> {
         return Ok(());
     }
 
+    if arguments.supported_solc_versions {
+        writeln!(
+            std::io::stdout(),
+            ">={},<={}",
+            revive_solidity::SolcFirstSupportedVersion,
+            revive_solidity::SolcLastSupportedVersion,
+        )?;
+        return Ok(());
+    }
+
     if arguments.license {
         let license_mit = include_str!("../../../../LICENSE-MIT");
         let license_apache = include_str!("../../../../LICENSE-APACHE");