WIP: Scala LSP

backend/src/langs.ts

@@ -2062,6 +2062,9 @@ binding_irb.run(IRB.conf)
     scope: {
       code: `val x = 123 * 234`,
     },
+    lsp: {
+      start: `mkdir -p .cache; [[ -d .cache/coursier ]] || cp -R /opt/coursier/cache .cache/coursier; JAVA_OPTS="-Duser.home=$PWD" metals`,
+    },
     template: `println("Hello, world!")
 `,
     timeout: 30,

scripts/docker-install-phase4.bash

@@ -237,6 +237,16 @@ for file in /opt/rust/bin/*; do
     ln -s /opt/rust/wrapper "/usr/local/bin/${file##*/}"
 done
 
+# Scala
+file="$(curl -sSL https://scalameta.org/metals/docs/editors/emacs.html | grep -Eo 'org.scalameta[^ ]+')"
+wget -nv https://git.io/coursier-cli
+chmod +x coursier-cli
+mv coursier-cli /usr/local/bin/coursier
+coursier bootstrap --java-opt -Xss4m --java-opt -Xms100m --java-opt -Dmetals.client=emacs "${file}" -r bintray:scalacenter/releases -r sonatype:snapshots -o /usr/local/bin/metals
+metals -version </dev/null
+mkdir /opt/coursier
+mv "$HOME/.cache/coursier" /opt/coursier/cache
+
 # SETL
 wget -nv https://setl.org/setl/bin/Linux-x86-64bit/setlbin.tgz
 tar -xf setlbin.tgz -C /usr/local/bin