printer: make compilation on non-unix, non-windows platforms work

Some of the new hyperlink work caused ripgrep to stop compiling
on non-{Unix,Windows} platforms. The most popular of which is WASI.

This commit makes non-{Unix,Windows} compile again. And we add a
very basic WASI test in CI to catch regressions.

More work is needed to make tests on non-{Unix,Windows} platforms
work. And of course, this commit specifically takes the path of disabling
hyperlink support for non-{Unix,Windows} platforms.

.github/workflows/ci.yml

@@ -189,6 +189,21 @@ jobs:
       shell: bash
       run: ${{ env.CARGO }} test --bin rg ${{ env.TARGET_FLAGS }} flags::defs::tests::available_shorts -- --nocapture
 
+     # Setup and compile on the wasm32-wasi target
+  wasm:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - name: Install Rust
+      uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: stable
+    - name: Add wasm32-wasi target
+      run: rustup target add wasm32-wasi
+    - name: Basic build
+      run: cargo build --verbose
+
   rustfmt:
     runs-on: ubuntu-latest
     steps:

crates/cli/src/hostname.rs

@@ -25,10 +25,10 @@ pub fn hostname() -> io::Result<OsString> {
     }
     #[cfg(not(any(windows, unix)))]
     {
-        io::Error::new(
+        Err(io::Error::new(
             io::ErrorKind::Other,
             "hostname could not be found on unsupported platform",
-        )
+        ))
     }
 }
 

crates/printer/src/hyperlink.rs

@@ -811,6 +811,13 @@ impl HyperlinkPath {
         Some(HyperlinkPath::encode(with_slash.as_bytes()))
     }
 
+    /// For other platforms (not windows, not unix), return None and log a debug message.
+    #[cfg(not(any(windows, unix)))]
+    pub(crate) fn from_path(original_path: &Path) -> Option<HyperlinkPath> {
+        log::debug!("hyperlinks are not supported on this platform");
+        None
+    }
+
     /// Percent-encodes a path.
     ///
     /// The alphanumeric ASCII characters and "-", ".", "_", "~" are unreserved