better error messages (#92)

1 files changed, 19 insertions, 14 deletions

diff --git a/lua/nvim-lsp-installer/installers/go.lua b/lua/nvim-lsp-installer/installers/go.lua
index 61e29383..aa2eeaba 100644
--- a/lua/nvim-lsp-installer/installers/go.lua
+++ b/lua/nvim-lsp-installer/installers/go.lua
@@ -1,25 +1,30 @@
 local path = require "nvim-lsp-installer.path"
+local std = require "nvim-lsp-installer.installers.std"
+local installers = require "nvim-lsp-installer.installers"
 local process = require "nvim-lsp-installer.process"
 
 local M = {}
 
 function M.packages(packages)
-    return function(server, callback, context)
-        local c = process.chain {
-            env = process.graft_env {
-                GO111MODULE = "on",
-                GOBIN = server.root_dir,
-                GOPATH = server.root_dir,
-            },
-            cwd = server.root_dir,
-            stdio_sink = context.stdio_sink,
-        }
+    return installers.pipe {
+        std.ensure_executables { { "go", "go was not found in path, refer to https://golang.org/doc/install." } },
+        function(server, callback, context)
+            local c = process.chain {
+                env = process.graft_env {
+                    GO111MODULE = "on",
+                    GOBIN = server.root_dir,
+                    GOPATH = server.root_dir,
+                },
+                cwd = server.root_dir,
+                stdio_sink = context.stdio_sink,
+            }
 
-        c.run("go", vim.list_extend({ "get", "-v" }, packages))
-        c.run("go", { "clean", "-modcache" })
+            c.run("go", vim.list_extend({ "get", "-v" }, packages))
+            c.run("go", { "clean", "-modcache" })
 
-        c.spawn(callback)
-    end
+            c.spawn(callback)
+        end,
+    }
 end
 
 function M.executable(root_dir, executable)