Parameter extra_volumes for mounting additional volumes on the container

README.md

@@ -124,6 +124,28 @@ require'lspconfig'.omnisharp.setup {
 }
 ```
 
+#### Mount Additional Volumes
+
+You can mount additional volumes to let the lsp server access caches or other directories.
+
+```lua
+require'lspconfig'.rust_analyzer.setup {
+  cmd = require'lspcontainers'.command(
+      'rust_analyzer',
+      {
+        extra_volumes = {
+          '/home/[UserName]/.cargo:/root/.cargo:ro',
+          ...
+        }
+      }
+  ),
+  ...
+}
+```
+
+The property `extra_volumes` recieves a list of strings formated for the `--volume` option of Docker.
+[See reference](https://docs.docker.com/engine/reference/run/#volume-shared-filesystems).
+
 ### Podman Support
 
 If you are using podman instead of docker it is sufficient to just specify "podman" as `container_runtime`:

lua/lspcontainers/init.lua

@@ -25,9 +25,9 @@ local supported_languages = {
       local user = user_id..":"..group_id
 
       if runtime == "docker" then
-      	network = "bridge"
+        network = "bridge"
       elseif runtime == "podman" then
-		network = "slirp4netns"
+        network = "slirp4netns"
       end
 
       return {
@@ -61,47 +61,53 @@ local supported_languages = {
   solargraph = { image = "docker.io/lspcontainers/solargraph" },
   sumneko_lua = { image = "docker.io/lspcontainers/lua-language-server" },
   svelte = { image = "docker.io/lspcontainers/svelte-language-server" },
-  tailwindcss= { image = "docker.io/lspcontainers/tailwindcss-language-server" },
+  tailwindcss = { image = "docker.io/lspcontainers/tailwindcss-language-server" },
   terraformls = { image = "docker.io/lspcontainers/terraform-ls" },
   tsserver = { image = "docker.io/lspcontainers/typescript-language-server" },
   vuels = { image = "docker.io/lspcontainers/vue-language-server" },
   yamlls = { image = "docker.io/lspcontainers/yaml-language-server" },
 }
 
 -- default command to run the lsp container
-local default_cmd = function (runtime, workdir, image, network, docker_volume)
+local default_cmd = function(runtime, workdir, image, network, docker_volume, extra_volumes)
   if vim.loop.os_uname().sysname == "Windows_NT" then
     workdir = Dos2UnixSafePath(workdir)
   end
 
-  local mnt_volume
-  if docker_volume ~= nil then
-    mnt_volume ="--volume="..docker_volume..":"..workdir..":z"
-  else
-    mnt_volume = "--volume="..workdir..":"..workdir..":z"
-  end
-
-  return {
+  local cmd = {
     runtime,
     "container",
     "run",
     "--interactive",
     "--rm",
-    "--network="..network,
-    "--workdir="..workdir,
-    mnt_volume,
-    image
+    "--network=" .. network,
+    "--workdir=" .. workdir,
   }
+
+  if docker_volume ~= nil then
+    table.insert(cmd, "--volume="..docker_volume..":"..workdir..":z")
+  else
+    table.insert(cmd, "--volume="..workdir..":"..workdir..":z")
+  end
+
+  for _, v in pairs(extra_volumes) do
+    table.insert(cmd, "--volume="..v)
+  end
+
+  table.insert(cmd, image)
+
+  return cmd
 end
 
 local function command(server, user_opts)
   -- Start out with the default values:
-  local opts =  {
+  local opts = {
     container_runtime = "docker",
     root_dir = vim.fn.getcwd(),
     cmd_builder = default_cmd,
     network = "none",
     docker_volume = nil,
+    extra_volumes = {},
   }
 
   -- If the LSP is known, it override the defaults:
@@ -119,7 +125,14 @@ local function command(server, user_opts)
     return 1
   end
 
-  return opts.cmd_builder(opts.container_runtime, opts.root_dir, opts.image, opts.network, opts.docker_volume)
+  return opts.cmd_builder(
+    opts.container_runtime,
+    opts.root_dir,
+    opts.image,
+    opts.network,
+    opts.docker_volume,
+    opts.extra_volumes
+  )
 end
 
 Dos2UnixSafePath = function(workdir)