1 files changed, 99 insertions, 0 deletions
diff --git a/pkgs/applications/editors/vscode/extensions/cpptools/default.nix b/pkgs/applications/editors/vscode/extensions/cpptools/default.nix
new file mode 100644
index 00000000000..077c3807eca
--- /dev/null
+++ b/pkgs/applications/editors/vscode/extensions/cpptools/default.nix
@@ -0,0 +1,99 @@
+{ lib, vscode-utils
+, fetchurl, mono, writeScript, runtimeShell
+, jq, clang-tools
+, gdbUseFixed ? true, gdb # The gdb default setting will be fixed to specified. Use version from `PATH` otherwise.
+}:
+
+/*
+  Note that this version of the extension still has some nix specific issues
+  which could not be fixed merely by patching (inside a C# dll).
+
+  In particular, the debugger requires either gnome-terminal or xterm. However
+  instead of looking for the terminal executable in `PATH`, for any linux platform
+  the dll uses an hardcoded path to one of these.
+
+  So, in order for debugging to work properly, you merely need to create symlinks
+  to one of these terminals at the appropriate location.
+
+  The good news is the the utility library is open source and with some effort
+  we could build a patched version ourselves. See:
+
+  <https://github.com/Microsoft/MIEngine/blob/2885386dc7f35e0f1e44827269341e786361f28e/src/MICore/TerminalLauncher.cs#L156>
+
+  Also, the extension should eventually no longer require an external terminal. See:
+
+  <https://github.com/Microsoft/vscode-cpptools/issues/35>
+
+  Once the symbolic link temporary solution taken, everything shoud run smootly.
+*/
+
+let
+  gdbDefaultsTo = if gdbUseFixed then "${gdb}/bin/gdb" else "gdb";
+
+
+  openDebugAD7Script = writeScript "OpenDebugAD7" ''
+    #!${runtimeShell}
+    BIN_DIR="$(cd "$(dirname "$0")" && pwd -P)"
+    ${if gdbUseFixed
+        then ''
+          export PATH=''${PATH}''${PATH:+:}${gdb}/bin
+        ''
+        else ""}
+    ${mono}/bin/mono $BIN_DIR/bin/OpenDebugAD7.exe $*
+  '';
+in
+
+vscode-utils.buildVscodeMarketplaceExtension rec {
+  mktplcRef = {
+    name = "cpptools";
+    publisher = "ms-vscode";
+    version = "1.7.1";
+  };
+
+  vsix = fetchurl {
+    name = "${mktplcRef.publisher}-${mktplcRef.name}.zip";
+    url = "https://github.com/microsoft/vscode-cpptools/releases/download/${mktplcRef.version}/cpptools-linux.vsix";
+    sha256 = "sha256-LqndG/vv8LgVPEX6dGkikDB6M6ISneo2UJ78izXVFbk=";
+  };
+
+  buildInputs = [
+    jq
+  ];
+
+  postPatch = ''
+    mv ./package.json ./package_orig.json
+
+    # 1. Add activation events so that the extension is functional. This listing is empty when unpacking the extension but is filled at runtime.
+    # 2. Patch `package.json` so that nix's *gdb* is used as default value for `miDebuggerPath`.
+    cat ./package_orig.json | \
+      jq --slurpfile actEvts ${./package-activation-events.json} '(.activationEvents) = $actEvts[0]' | \
+      jq '(.contributes.debuggers[].configurationAttributes | .attach , .launch | .properties.miDebuggerPath | select(. != null) | select(.default == "/usr/bin/gdb") | .default) = "${gdbDefaultsTo}"' > \
+      ./package.json
+
+    # Prevent download/install of extensions
+    touch "./install.lock"
+
+    # Mono runtimes from nix package (used by generated `OpenDebugAD7`).
+    mv ./debugAdapters/bin/OpenDebugAD7 ./debugAdapters/bin/OpenDebugAD7_orig
+    cp -p "${openDebugAD7Script}" "./debugAdapters/bin/OpenDebugAD7"
+
+    # Clang-format from nix package.
+    mv  ./LLVM/ ./LLVM_orig
+    mkdir "./LLVM/"
+    find "${clang-tools}" -mindepth 1 -maxdepth 1 | xargs ln -s -t "./LLVM"
+
+    # Patching  cpptools and cpptools-srv
+    elfInterpreter="$(cat $NIX_CC/nix-support/dynamic-linker)"
+    patchelf --set-interpreter "$elfInterpreter" ./bin/cpptools
+    patchelf --set-interpreter "$elfInterpreter" ./bin/cpptools-srv
+    chmod a+x ./bin/cpptools{-srv,}
+  '';
+
+    meta = with lib; {
+      license = licenses.unfree;
+      maintainers = [ maintainers.jraygauthier ];
+      # A 32 bit linux would also be possible with some effort (specific download of binaries +
+      # patching of the elf files with 32 bit interpreter).
+      platforms = [ "x86_64-linux" ];
+    };
+}