Disable WSL integration

With WSL, objdiff is unable to get filesystem notifications.
It's recommended to run objdiff natively on Windows, so having this option
is more confusing than useful.

Author: encounter

Cargo.toml

@@ -20,6 +20,7 @@ strip = "debuginfo"
 [features]
 default = []
 wgpu = ["eframe/wgpu"]
+wsl = []
 
 [dependencies]
 anyhow = "1.0.75"

src/views/config.rs

@@ -1,12 +1,12 @@
-#[cfg(windows)]
+#[cfg(feature = "wsl")]
 use std::string::FromUtf16Error;
 use std::{
     borrow::Cow,
     mem::take,
     path::{PathBuf, MAIN_SEPARATOR},
 };
 
-#[cfg(windows)]
+#[cfg(feature = "wsl")]
 use anyhow::{Context, Result};
 use const_format::formatcp;
 use egui::{
@@ -43,7 +43,7 @@ pub struct ConfigViewState {
     pub object_search: String,
     pub filter_diffable: bool,
     pub filter_incomplete: bool,
-    #[cfg(windows)]
+    #[cfg(feature = "wsl")]
     pub available_wsl_distros: Option<Vec<String>>,
 }
 
@@ -87,7 +87,7 @@ pub const DEFAULT_WATCH_PATTERNS: &[&str] = &[
     "*.inc", "*.py", "*.yml", "*.txt", "*.json",
 ];
 
-#[cfg(windows)]
+#[cfg(feature = "wsl")]
 fn process_utf16(bytes: &[u8]) -> Result<String, FromUtf16Error> {
     let u16_bytes: Vec<u16> = bytes
         .chunks_exact(2)
@@ -96,7 +96,7 @@ fn process_utf16(bytes: &[u8]) -> Result<String, FromUtf16Error> {
     String::from_utf16(&u16_bytes)
 }
 
-#[cfg(windows)]
+#[cfg(feature = "wsl")]
 fn wsl_cmd(args: &[&str]) -> Result<String> {
     use std::{os::windows::process::CommandExt, process::Command};
     let output = Command::new("wsl")
@@ -107,7 +107,7 @@ fn wsl_cmd(args: &[&str]) -> Result<String> {
     process_utf16(&output.stdout).context("Failed to process stdout")
 }
 
-#[cfg(windows)]
+#[cfg(feature = "wsl")]
 fn fetch_wsl2_distros() -> Vec<String> {
     wsl_cmd(&["-l", "-q"])
         .map(|stdout| {
@@ -180,7 +180,7 @@ pub fn config_ui(
     }
     ui.separator();
 
-    #[cfg(windows)]
+    #[cfg(feature = "wsl")]
     {
         ui.heading("Build");
         if state.available_wsl_distros.is_none() {
@@ -196,7 +196,7 @@ pub fn config_ui(
             });
         ui.separator();
     }
-    #[cfg(not(windows))]
+    #[cfg(not(feature = "wsl"))]
     {
         let _ = selected_wsl_distro;
     }