wasmtime: add enableShared/enableStatic & shell completions (#440501)

pkgs/by-name/wa/wasmtime/package.nix

@@ -3,9 +3,13 @@
   stdenv,
   rustPlatform,
   fetchFromGitHub,
+  buildPackages,
   cmake,
+  installShellFiles,
   versionCheckHook,
   nix-update-script,
+  enableShared ? !stdenv.hostPlatform.isStatic,
+  enableStatic ? stdenv.hostPlatform.isStatic,
 }:
 rustPlatform.buildRustPackage (finalAttrs: {
   pname = "wasmtime";
@@ -35,7 +39,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "dev"
   ];
 
-  nativeBuildInputs = [ cmake ];
+  nativeBuildInputs = [
+    cmake
+    installShellFiles
+  ];
 
   doCheck =
     with stdenv.buildPlatform;
@@ -54,10 +61,12 @@ rustPlatform.buildRustPackage (finalAttrs: {
 
   postInstall =
     let
-      inherit (stdenv.targetPlatform.rust) cargoShortTarget;
+      inherit (stdenv.hostPlatform.rust) cargoShortTarget;
     in
     ''
       moveToOutput lib $dev
+      ${lib.optionalString (!enableShared) "rm $dev/lib/*.so{,.*}"}
+      ${lib.optionalString (!enableStatic) "rm $dev/lib/*.a"}
 
       # copy the build.rs generated c-api headers
       # https://github.com/rust-lang/cargo/issues/9661
@@ -67,6 +76,18 @@ rustPlatform.buildRustPackage (finalAttrs: {
       install_name_tool -id \
         $dev/lib/libwasmtime.dylib \
         $dev/lib/libwasmtime.dylib
+    ''
+    + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+      installShellCompletion --cmd wasmtime \
+        --bash <("$out/bin/wasmtime" completion bash) \
+        --zsh <("$out/bin/wasmtime" completion zsh) \
+        --fish <("$out/bin/wasmtime" completion fish)
+    ''
+    + lib.optionalString (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
+      installShellCompletion --cmd wasmtime \
+        --bash "${buildPackages.wasmtime}"/share/bash-completion/completions/*.bash \
+        --zsh "${buildPackages.wasmtime}"/share/zsh/site-functions/* \
+        --fish "${buildPackages.wasmtime}"/share/fish/*/*
     '';
 
   nativeInstallCheckInputs = [