support installing specific version of language servers, defaults to latest (#106)

1 files changed, 89 insertions, 0 deletions

diff --git a/lua/nvim-lsp-installer/installers/context.lua b/lua/nvim-lsp-installer/installers/context.lua
new file mode 100644
index 00000000..057c3620
--- /dev/null
+++ b/lua/nvim-lsp-installer/installers/context.lua
@@ -0,0 +1,89 @@
+local Data = require "nvim-lsp-installer.data"
+local Log = require "nvim-lsp-installer.log"
+local process = require "nvim-lsp-installer.process"
+local platform = require "nvim-lsp-installer.platform"
+
+local M = {}
+
+local function fetch(url, callback)
+    local stdio = process.in_memory_sink()
+    if platform.is_unix then
+        process.spawn("wget", {
+            args = { "-nv", "-O", "-", url },
+            stdio_sink = stdio.sink,
+        }, function(success)
+            if success then
+                callback(nil, table.concat(stdio.buffers.stdout, ""))
+            else
+                callback(("Failed to fetch url=%s"):format(url), nil)
+            end
+        end)
+    elseif platform.is_win then
+        local script = {
+            "$ProgressPreference = 'SilentlyContinue'",
+            ("Write-Output (iwr -Uri %q).Content"):format(url),
+        }
+        process.spawn("powershell.exe", {
+            args = { "-Command", table.concat(script, ";") },
+            stdio_sink = stdio.sink,
+        }, function(success)
+            if success then
+                callback(nil, table.concat(stdio.buffers.stdout, ""))
+            else
+                callback(("Failed to fetch url=%s"):format(url), nil)
+            end
+        end)
+    else
+        error "Unexpected error: Unsupported OS."
+    end
+end
+
+function M.github_release_file(repo, file)
+    local function get_download_url(version)
+        return ("https://github.com/%s/releases/download/%s/%s"):format(
+            repo,
+            version,
+            type(file) == "function" and file(version) or file
+        )
+    end
+
+    return function(server, callback, context)
+        if context.requested_server_version then
+            context.github_release_file = get_download_url(context.requested_server_version)
+            callback(true)
+        else
+            context.stdio_sink.stdout "Fetching latest release version from GitHub API..."
+            fetch(
+                ("https://api.github.com/repos/%s/releases/latest"):format(repo),
+                vim.schedule_wrap(function(err, response)
+                    if err then
+                        context.stdio_sink.stderr "Failed to fetch latest release version from GitHub API."
+                        return callback(false)
+                    else
+                        local version = Data.json_decode(response).tag_name
+                        Log.debug("Resolved latest version", server.name, version)
+                        context.requested_server_version = version
+                        context.github_release_file = get_download_url(version)
+                        callback(true)
+                    end
+                end)
+            )
+        end
+    end
+end
+
+function M.capture(fn)
+    return function(server, callback, context, ...)
+        local installer = fn(context)
+        installer(server, callback, context, ...)
+    end
+end
+
+function M.set(fn)
+    return function(_, callback, context)
+        fn(context)
+        callback(true)
+    end
+end
+
+return M