feat: add url_join (#856)

lua/avante/providers/azure.lua

@@ -25,11 +25,10 @@ M.parse_curl_args = function(provider, code_opts)
   if not P.env.is_local("azure") then headers["api-key"] = provider.parse_api_key() end
 
   return {
-    url = Utils.trim(base.endpoint, { suffix = "/" })
-      .. "/openai/deployments/"
-      .. base.deployment
-      .. "/chat/completions?api-version="
-      .. base.api_version,
+    url = Utils.url_join(
+      base.endpoint,
+      "/openai/deployments/" .. base.deployment .. "/chat/completions?api-version=" .. base.api_version
+    ),
     proxy = base.proxy,
     insecure = base.allow_insecure,
     headers = headers,

lua/avante/providers/claude.lua

@@ -106,7 +106,7 @@ M.parse_curl_args = function(provider, prompt_opts)
   local messages = M.parse_messages(prompt_opts)
 
   return {
-    url = Utils.trim(base.endpoint, { suffix = "/" }) .. "/v1/messages",
+    url = Utils.url_join(base.endpoint, "/v1/messages"),
     proxy = base.proxy,
     insecure = base.allow_insecure,
     headers = headers,

lua/avante/providers/cohere.lua

@@ -85,7 +85,7 @@ M.parse_curl_args = function(provider, code_opts)
   if not P.env.is_local("cohere") then headers["Authorization"] = "Bearer " .. provider.parse_api_key() end
 
   return {
-    url = Utils.trim(base.endpoint, { suffix = "/" }) .. "/chat",
+    url = Utils.url_join(base.endpoint, "/chat"),
     proxy = base.proxy,
     insecure = base.allow_insecure,
     headers = headers,

lua/avante/providers/gemini.lua

@@ -86,11 +86,10 @@ M.parse_curl_args = function(provider, code_opts)
   body_opts.max_tokens = nil
 
   return {
-    url = Utils.trim(base.endpoint, { suffix = "/" })
-      .. "/"
-      .. base.model
-      .. ":streamGenerateContent?alt=sse&key="
-      .. provider.parse_api_key(),
+    url = Utils.url_join(
+      base.endpoint,
+      base.model .. ":streamGenerateContent?alt=sse&key=" .. provider.parse_api_key()
+    ),
     proxy = base.proxy,
     insecure = base.allow_insecure,
     headers = { ["Content-Type"] = "application/json" },

lua/avante/providers/openai.lua

@@ -136,7 +136,7 @@ M.parse_curl_args = function(provider, code_opts)
   end
 
   return {
-    url = Utils.trim(base.endpoint, { suffix = "/" }) .. "/chat/completions",
+    url = Utils.url_join(base.endpoint, "/chat/completions"),
     proxy = base.proxy,
     insecure = base.allow_insecure,
     headers = headers,

lua/avante/utils/init.lua

@@ -438,6 +438,32 @@ function M.trim_spaces(s) return s:match("^%s*(.-)%s*$") end
 
 function M.fallback(v, default_value) return type(v) == "nil" and default_value or v end
 
+---Join URL parts together, handling slashes correctly
+---@param ... string URL parts to join
+---@return string Joined URL
+function M.url_join(...)
+  local parts = { ... }
+  local result = parts[1] or ""
+
+  for i = 2, #parts do
+    local part = parts[i]
+    if not part or part == "" then goto continue end
+
+    -- Remove trailing slash from result if present
+    if result:sub(-1) == "/" then result = result:sub(1, -2) end
+
+    -- Remove leading slash from part if present
+    if part:sub(1, 1) == "/" then part = part:sub(2) end
+
+    -- Join with slash
+    result = result .. "/" .. part
+
+    ::continue::
+  end
+
+  return result
+end
+
 -- luacheck: push no max comment line length
 ---@param type_name "'nil'" | "'number'" | "'string'" | "'boolean'" | "'table'" | "'function'" | "'thread'" | "'userdata'" | "'list'" | '"map"'
 ---@return boolean