tcl: Phase 3 OCaml primitives — file-read/write/append/exists?/glob + clock-seconds/milliseconds/format in sx_primitives.ml + unix dep; tcl-cmd-clock/file wired up; 337/337 green

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hosts/ocaml/lib/dune

@@ -1,4 +1,4 @@
 (library
  (name sx)
  (wrapped false)
- (libraries re re.pcre))
+ (libraries re re.pcre unix))

hosts/ocaml/lib/sx_primitives.ml

@@ -1871,4 +1871,143 @@ let () =
     | [rx] ->
       let (_, _, flags) = regex_of_value rx in
       String flags
-    | _ -> raise (Eval_error "regex-flags: (regex)"))
+    | _ -> raise (Eval_error "regex-flags: (regex)"));
+
+  (* === File I/O === *)
+  register "file-read" (fun args ->
+    match args with
+    | [String path] ->
+      (try
+        let ic = open_in path in
+        let n = in_channel_length ic in
+        let s = Bytes.create n in
+        really_input ic s 0 n;
+        close_in ic;
+        String (Bytes.to_string s)
+      with Sys_error msg -> raise (Eval_error ("file-read: " ^ msg)))
+    | _ -> raise (Eval_error "file-read: (path)"));
+
+  register "file-write" (fun args ->
+    match args with
+    | [String path; String content] ->
+      (try
+        let oc = open_out path in
+        output_string oc content;
+        close_out oc;
+        Nil
+      with Sys_error msg -> raise (Eval_error ("file-write: " ^ msg)))
+    | _ -> raise (Eval_error "file-write: (path content)"));
+
+  register "file-append" (fun args ->
+    match args with
+    | [String path; String content] ->
+      (try
+        let oc = open_out_gen [Open_append; Open_creat; Open_wronly; Open_text] 0o644 path in
+        output_string oc content;
+        close_out oc;
+        Nil
+      with Sys_error msg -> raise (Eval_error ("file-append: " ^ msg)))
+    | _ -> raise (Eval_error "file-append: (path content)"));
+
+  register "file-exists?" (fun args ->
+    match args with
+    | [String path] -> Bool (Sys.file_exists path)
+    | _ -> raise (Eval_error "file-exists?: (path)"));
+
+  register "file-glob" (fun args ->
+    let glob_match pat str =
+      let pn = String.length pat and sn = String.length str in
+      let rec go pi si =
+        if pi = pn then si = sn
+        else match pat.[pi] with
+          | '*' ->
+            let rec try_from i = i <= sn && (go (pi+1) i || try_from (i+1)) in
+            try_from si
+          | '?' -> si < sn && go (pi+1) (si+1)
+          | '[' ->
+            let pi' = ref (pi+1) in
+            let negate = !pi' < pn && pat.[!pi'] = '^' in
+            if negate then incr pi';
+            let matched = ref false in
+            while !pi' < pn && pat.[!pi'] <> ']' do
+              let c1 = pat.[!pi'] in
+              incr pi';
+              if !pi' + 1 < pn && pat.[!pi'] = '-' then begin
+                let c2 = pat.[!pi' + 1] in
+                pi' := !pi' + 2;
+                if si < sn && str.[si] >= c1 && str.[si] <= c2 then matched := true
+              end else if si < sn && str.[si] = c1 then matched := true
+            done;
+            if !pi' < pn then incr pi';
+            ((!matched && not negate) || (not !matched && negate)) && go !pi' (si+1)
+          | c -> si < sn && str.[si] = c && go (pi+1) (si+1)
+      in go 0 0
+    in
+    let glob_paths pat =
+      let dir = Filename.dirname pat in
+      let base_pat = Filename.basename pat in
+      let dir' = if dir = "." && not (String.length pat > 1 && pat.[0] = '.') then "." else dir in
+      (try
+        let entries = Sys.readdir dir' in
+        Array.fold_left (fun acc entry ->
+          if glob_match base_pat entry then
+            let full = if dir' = "." then entry else Filename.concat dir' entry in
+            full :: acc
+          else acc
+        ) [] entries
+        |> List.sort String.compare
+      with Sys_error _ -> [])
+    in
+    match args with
+    | [String pat] -> List (List.map (fun s -> String s) (glob_paths pat))
+    | _ -> raise (Eval_error "file-glob: (pattern)"));
+
+  (* === Clock === *)
+  register "clock-seconds" (fun args ->
+    match args with
+    | [] -> Number (Float.round (Unix.gettimeofday ()))
+    | _ -> raise (Eval_error "clock-seconds: no args"));
+
+  register "clock-milliseconds" (fun args ->
+    match args with
+    | [] -> Number (Float.round (Unix.gettimeofday () *. 1000.0))
+    | _ -> raise (Eval_error "clock-milliseconds: no args"));
+
+  register "clock-format" (fun args ->
+    match args with
+    | [Number t_f] | [Number t_f; String _] ->
+      let t = int_of_float t_f in
+      let fmt = (match args with [_; String f] -> f | _ -> "%a %b %e %H:%M:%S %Z %Y") in
+      let tm = Unix.gmtime (float_of_int t) in
+      let buf = Buffer.create 32 in
+      let n = String.length fmt in
+      let i = ref 0 in
+      while !i < n do
+        if fmt.[!i] = '%' && !i + 1 < n then begin
+          (match fmt.[!i + 1] with
+           | 'Y' -> Buffer.add_string buf (Printf.sprintf "%04d" (1900 + tm.Unix.tm_year))
+           | 'm' -> Buffer.add_string buf (Printf.sprintf "%02d" (tm.Unix.tm_mon + 1))
+           | 'd' -> Buffer.add_string buf (Printf.sprintf "%02d" tm.Unix.tm_mday)
+           | 'e' -> Buffer.add_string buf (Printf.sprintf "%2d"  tm.Unix.tm_mday)
+           | 'H' -> Buffer.add_string buf (Printf.sprintf "%02d" tm.Unix.tm_hour)
+           | 'M' -> Buffer.add_string buf (Printf.sprintf "%02d" tm.Unix.tm_min)
+           | 'S' -> Buffer.add_string buf (Printf.sprintf "%02d" tm.Unix.tm_sec)
+           | 'j' -> Buffer.add_string buf (Printf.sprintf "%03d" (tm.Unix.tm_yday + 1))
+           | 'Z' -> Buffer.add_string buf "UTC"
+           | 'a' -> let days = [|"Sun";"Mon";"Tue";"Wed";"Thu";"Fri";"Sat"|] in
+                    Buffer.add_string buf days.(tm.Unix.tm_wday)
+           | 'A' -> let days = [|"Sunday";"Monday";"Tuesday";"Wednesday";"Thursday";"Friday";"Saturday"|] in
+                    Buffer.add_string buf days.(tm.Unix.tm_wday)
+           | 'b' | 'h' -> let mons = [|"Jan";"Feb";"Mar";"Apr";"May";"Jun";"Jul";"Aug";"Sep";"Oct";"Nov";"Dec"|] in
+                    Buffer.add_string buf mons.(tm.Unix.tm_mon)
+           | 'B' -> let mons = [|"January";"February";"March";"April";"May";"June";"July";"August";"September";"October";"November";"December"|] in
+                    Buffer.add_string buf mons.(tm.Unix.tm_mon)
+           | c -> Buffer.add_char buf '%'; Buffer.add_char buf c);
+          i := !i + 2
+        end else begin
+          Buffer.add_char buf fmt.[!i];
+          incr i
+        end
+      done;
+      String (Buffer.contents buf)
+    | _ -> raise (Eval_error "clock-format: (seconds [format])"))