Merge pull request #302 from jolt-lang/windows-nrepl-and-version

Fix nREPL on Windows; add a version string

.github/workflows/release.yml

@@ -154,6 +154,10 @@ jobs:
       # dev-machine check — see jolt-8479). `make joltc-release`, not `make joltc`.
       - name: Build joltc (release)
         run: make joltc-release
+        env:
+          # Bake the release tag into the binary (build-joltc falls back to
+          # `git describe` when this is empty, e.g. a workflow_dispatch dry run).
+          JOLT_VERSION: ${{ startsWith(github.ref, 'refs/tags/') && github.ref_name || '' }}
 
       - name: Inspect the binary (Windows)
         if: runner.os == 'Windows'

bin/joltc

@@ -14,5 +14,7 @@
 # JOLT_PWD.
 root="$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)"
 export JOLT_PWD="${JOLT_PWD:-$PWD}"
+# Version for --version / banners: git describe of this checkout, else "dev".
+export JOLT_VERSION="${JOLT_VERSION:-$(git -C "$root" describe --tags --always --dirty 2>/dev/null || echo dev)}"
 cd "$root" || exit 1
 exec chez --script host/chez/cli.ss "$@"

host/chez/build-joltc.ss

@@ -46,6 +46,15 @@
 (unless (or jb-release? (string=? jb-profile "debug"))
   (error 'build-joltc "profile must be \"release\" or \"debug\"" jb-profile))
 
+;; Version baked into the binary's saved heap. Prefer $JOLT_VERSION (CI sets it to
+;; the release tag); else derive it from git in this checkout; else "dev".
+(define jb-version
+  (let ((env (getenv "JOLT_VERSION")))
+    (if (and env (> (string-length env) 0))
+        env
+        (let ((s (bld-sh-capture "git describe --tags --always --dirty 2>/dev/null")))
+          (if (> (string-length s) 0) s "dev")))))
+
 (define jb-build (string-append jb-out ".build"))
 (bld-check-toolchain)
 (bld-system (string-append "mkdir -p '" (path-parent jb-out) "' '" jb-build "'"))
@@ -164,6 +173,10 @@
   (jb-emit-runtime-embeds out)
   (put-string out "\n;; === embedded jolt-core + stdlib source ===\n")
   (jb-emit-source-embeds out)
+  ;; Bake the version into the saved heap (runs at heap-build; loader.ss defined
+  ;; jolt-baked-version above, so this set! resolves).
+  (put-string out (string-append "\n;; === baked version ===\n(set! jolt-baked-version "
+                                 (ei-str-lit jb-version) ")\n"))
   (put-string out "\n;; === joltc launcher ===\n")
   (jb-emit-launcher out)
   (close-port out))

host/chez/loader.ss

@@ -384,3 +384,14 @@
 (def-var! "jolt.host" "load-namespace" (lambda (n) (load-namespace n) jolt-nil))
 (def-var! "jolt.host" "file-exists?" (lambda (p) (if (file-exists? p) #t #f)))
 (def-var! "jolt.host" "getenv" (lambda (n) (let ((v (getenv n))) (if v v jolt-nil))))
+
+;; jolt version string. A self-contained binary build bakes the real tag into the
+;; saved heap by emitting (set! jolt-baked-version "…") in flat.ss; a dev run off
+;; the seed leaves it #f and falls back to $JOLT_VERSION (bin/joltc sets it from
+;; `git describe`), then "dev".
+(define jolt-baked-version #f)
+(def-var! "jolt.host" "jolt-version"
+  (lambda ()
+    (or jolt-baked-version
+        (let ((v (getenv "JOLT_VERSION"))) (and v (> (string-length v) 0) v))
+        "dev")))

jolt-core/jolt/deps.clj

@@ -66,6 +66,10 @@
       (if-let [root (:deps/root spec)] (str checkout "/" root) checkout))
     (:jolt/module spec)
     (do (warn "skipping janet dependency " coord " (:jolt/module is obsolete on Chez)") nil)
+    ;; jolt IS Clojure — a dependency on org.clojure/clojure is satisfied
+    ;; intrinsically, so skip it silently rather than warning about the (unusable)
+    ;; :mvn/version coordinate.
+    (= coord 'org.clojure/clojure) nil
     :else
     (do (warn "skipping unsupported coordinate " coord " " (pr-str spec)) nil)))
 

jolt-core/jolt/main.clj

@@ -8,6 +8,8 @@
 
 (defn- project-dir [] (or (jolt.host/getenv "JOLT_PWD") "."))
 
+(defn- version [] (jolt.host/jolt-version))
+
 (defn- current-platform []
   (let [os (str/lower-case (or (System/getProperty "os.name") ""))]
     (cond (str/includes? os "mac") :darwin
@@ -145,7 +147,7 @@
   ;; loaded — same context a run gets, so (require '[some.lib]) works in the REPL.
   (try (apply-project! (deps/resolve-project (project-dir)))
        (catch :default _ nil))
-  (println ";; jolt repl — :repl/quit or ^D to exit")
+  (println (str ";; jolt " (version) " repl — :repl/quit or ^D to exit"))
   (loop []
     (let [form (repl-read-form)]
       (when form
@@ -294,7 +296,9 @@
         (when stop (stop))))))
 
 (defn- usage []
+  (println (str "jolt " (version)))
   (println "usage: jolt <command> [args]")
+  (println "  -e EXPR                evaluate EXPR and print the result")
   (println "  run -m NS [args]       resolve deps.edn, load NS, call its -main")
   (println "  run FILE               load a Clojure file")
   (println "  build -m NS [-o OUT] [--opt|--dev] [--direct-link] [--tree-shake] [--dynamic]  compile a standalone binary")
@@ -304,6 +308,7 @@
   (println "  --nrepl-server [port]  start an nREPL server (default 7888) for editors")
   (println "  path                   print the resolved source roots")
   (println "  <task>                 run a deps.edn :tasks entry")
+  (println "  --version              print the jolt version")
   (println "  --help                 print this message"))
 
 (defn -main [& args]
@@ -312,6 +317,7 @@
       (nil? cmd)                  (usage)
       (= cmd "--help")            (usage)
       (= cmd "-h")                (usage)
+      (#{"--version" "-V"} cmd)   (println (str "jolt " (version)))
       (= cmd "run")               (cmd-run more)
       (= cmd "repl")              (repl)
       (= cmd "--nrepl-server")    (nrepl more)

jolt-core/jolt/nrepl.clj

@@ -21,25 +21,66 @@
             [jolt.ffi :as ffi]))
 
 ;; --- sockets (loopback server) ---------------------------------------------
-;; Load libc (the running process's symbols) BEFORE the foreign-fn bindings below
-;; — defcfn resolves the C entry point when the def is evaluated (at ns load), so
-;; the socket symbols must already be available.
-(ffi/load-library)
+(def ^:private os-name
+  (str/lower-case (or (System/getProperty "os.name") "")))
+(def ^:private macos?   (str/includes? os-name "mac"))
+(def ^:private windows? (str/includes? os-name "win"))
+
+;; Load the library that provides the socket symbols BEFORE the foreign-fn
+;; bindings below — defcfn resolves the C entry point when the def is evaluated
+;; (at ns load), so the symbols must already be available. POSIX: the running
+;; process's own libc symbols. Windows: the Winsock DLL (ws2_32), whose symbols
+;; are NOT in joltc.exe's export table even though it's linked in — without this
+;; explicit load, (ffi/defcfn c-socket "socket" ...) fails at load with
+;; "no entry for socket".
+(if windows?
+  (ffi/load-library "ws2_32.dll")
+  (ffi/load-library))
+
+;; A socket is an int fd on POSIX; on Win64 it's a SOCKET (uintptr_t) handle, but
+;; those are small kernel handle values that round-trip through :int, and the
+;; INVALID_SOCKET error sentinel (~0) reads back as -1 — so the fd checks below
+;; work unchanged on both.
 (ffi/defcfn c-socket     "socket"     [:int :int :int] :int)
 (ffi/defcfn c-bind       "bind"       [:int :pointer :int] :int)
 (ffi/defcfn c-listen     "listen"     [:int :int] :int)
 (ffi/defcfn c-setsockopt "setsockopt" [:int :int :int :pointer :int] :int)
-  (ffi/defcfn c-accept     "accept"     [:int :pointer :pointer] :int :blocking)
-  (ffi/defcfn c-recv       "recv"       [:int :pointer :size_t :int] :ssize_t :blocking)
-  (ffi/defcfn c-send       "send"       [:int :pointer :size_t :int] :ssize_t :blocking)
-(ffi/defcfn c-close      "close"      [:int] :int)
+(ffi/defcfn c-accept     "accept"     [:int :pointer :pointer] :int :blocking)
+
+;; recv/send and the socket-close call differ by platform. Winsock's recv/send
+;; take an int length and return int (not ssize_t), and a socket is closed with
+;; closesocket, not close. A symbol that exists on only one OS (closesocket on
+;; Windows, close on POSIX) can only be bound there, so these live in the taken
+;; platform branch — jolt interns the vars from both branches at analysis time,
+;; so later references resolve either way.
+(if windows?
+  (do
+    (ffi/defcfn c-recv  "recv"        [:int :pointer :int :int] :int :blocking)
+    (ffi/defcfn c-send  "send"        [:int :pointer :int :int] :int :blocking)
+    (ffi/defcfn c-close "closesocket" [:int] :int)
+    ;; Winsock must be initialized once per process before any socket call.
+    (ffi/defcfn c-wsastartup "WSAStartup" [:int :pointer] :int))
+  (do
+    (ffi/defcfn c-recv  "recv"  [:int :pointer :size_t :int] :ssize_t :blocking)
+    (ffi/defcfn c-send  "send"  [:int :pointer :size_t :int] :ssize_t :blocking)
+    (ffi/defcfn c-close "close" [:int] :int)))
 
 (def ^:private AF-INET 2)
 (def ^:private SOCK-STREAM 1)
-(def ^:private macos?
-  (str/includes? (str/lower-case (or (System/getProperty "os.name") "")) "mac"))
-(def ^:private sol-socket (if macos? 0xffff 1))
-(def ^:private so-reuse   (if macos? 4 2))
+;; SOL_SOCKET / SO_REUSEADDR: 0xffff / 4 on macOS and Windows, 1 / 2 on Linux.
+(def ^:private sol-socket (if (or macos? windows?) 0xffff 1))
+(def ^:private so-reuse   (if (or macos? windows?) 4 2))
+
+;; Initialize Winsock (a no-op off Windows). WSAStartup is refcounted and must
+;; precede any socket call; WSADATA is ~408 bytes on x64, so 512 is ample.
+(defn- ensure-winsock! []
+  (when windows?
+    (let [wsadata (ffi/alloc 512)]
+      (try
+        (let [r (c-wsastartup 0x0202 wsadata)]
+          (when-not (zero? r)
+            (throw (ex-info (str "WSAStartup failed: " r) {}))))
+        (finally (ffi/free wsadata))))))
 
 (defn- make-sockaddr [port]
   (let [sa (ffi/alloc 16)]
@@ -53,7 +94,7 @@
     sa))
 
 (defn- listen-socket [port]
-  (ffi/load-library)                                         ; libc process symbols
+  (ensure-winsock!)                                          ; no-op off Windows
   (let [fd (c-socket AF-INET SOCK-STREAM 0)]
     (when (neg? fd) (throw (ex-info "socket() failed" {})))
     (let [opt (ffi/alloc 4)] (ffi/write opt :int 0 1) (c-setsockopt fd sol-socket so-reuse opt 4) (ffi/free opt))
@@ -240,7 +281,8 @@
          fd (listen-socket port)                  ; throws on bind/listen failure
          stopped (atom false)]
      (try (spit ".nrepl-port" (str port)) (catch :default _ nil))
-     (println (str "nREPL server started on port " port " (127.0.0.1) — .nrepl-port written"))
+     (println (str "jolt " (jolt.host/jolt-version) " nREPL server started on port "
+                   port " (127.0.0.1) — .nrepl-port written"))
      (when (seq middleware) (println (str ";; middleware: " (str/join " " middleware))))
      (println ";; connect your editor; ^C to stop")
       (future