Implement stdlib directory, -I, --no-prelude, etc.

[goals.git] / src / main.ml

diff --git a/src/main.ml b/src/main.ml
index c23b70a..127c24c 100644 (file)
--- a/src/main.ml
+++ b/src/main.ml
@@ -19,90 +19,30 @@
 
 open Printf
 
-open Utils
-
-(* See also "let id" in [lexer.mll]. *)
-let var_regexp =
-  Str.regexp "\\([a-zA-Z_][a-zA-Z0-9_]*\\)[ \t]*=[ \t]*\\(.*\\)"
-
-let usage =
-  "\
-goals: Build software.
-
- goals [-f Goalfile] ['var=value' ...] ['target' ...]
-
-For detailed help see goals(1).
-
-Options:"
-
-let print_version () =
-  printf "%s %s\n" Config.package_name Config.package_version;
-  exit 0
-
 let main () =
-  (* Get stdlib directory. *)
-  let datadir =
-    try Sys.getenv "GOALS_DATADIR" with Not_found -> Config.datadir in
-  let stdlibdir = datadir // "stdlib" in
-  let prelude_gl = stdlibdir // "prelude.gl" in
-  if not (is_directory stdlibdir) || not (Sys.file_exists prelude_gl) then
-    failwithf "%s: cannot find the standard library directory, expected %s.  If the standard library directory is in a non-standard location then set GOALS_DATADIR.  If you can trying to run goals from the build directory then use ‘./run goals ...’"
-      Sys.executable_name stdlibdir;
-
-  (* Command line arguments. *)
-  let args = ref [] in
-  let directory = ref "." in
-  let filename = ref "Goalfile" in
-
-  let argspec = [
-    "-C",          Arg.Set_string directory,
-                   "directory Change to directory before running";
-    "--directory", Arg.Set_string directory,
-                   "directory Change to directory before running";
-    "-f",          Arg.Set_string filename,
-                   "filename Set name of Goalfile";
-    "--file",      Arg.Set_string filename,
-                   "filename Set name of Goalfile";
-    "-V",          Arg.Unit print_version,
-                   " Print version and exit";
-    "--version",   Arg.Unit print_version,
-                   " Print version and exit";
-  ] in
-  let argspec = Arg.align argspec in
-  let anon_fun s = args := s :: !args in
-  Arg.parse argspec anon_fun usage;
+  (* Change directory (-C option). *)
+  Sys.chdir Cmdline.directory;
 
-  let args = List.rev !args in
-  let directory = !directory in
-  let filename = !filename in
+  (* Parse the prelude. *)
+  let env =
+    if Cmdline.use_prelude then
+      Parse.parse_goalfile Ast.Env.empty Cmdline.prelude_file
+    else
+      Ast.Env.empty in
 
   (* Parse the input file. *)
-  let env = Parse.parse_goalfile filename in
+  let env = Parse.parse_goalfile env Cmdline.input_file in
 
-  (* Now we've read the input, change directory. *)
-  Sys.chdir directory;
+  (* Parse the command line assignments. *)
+  let env =
+    List.fold_left (
+      fun env (name, expr) ->
+        let expr = Parse.parse_cli_expr expr in
+        Ast.Env.add name expr env
+    ) env Cmdline.anon_vars in
 
-  (* Parse the command line anon args.  Each parameter has the
-   * form "name=<expr>" to assign a value to a variable, or
-   * "<expr>" to indicate a target to build.
-   *)
-  let targets = ref [] in
-  let env = ref env in
-  List.iter (
-    fun arg ->
-      if Str.string_match var_regexp arg 0 then (
-        (* assignment *)
-        let name = Str.matched_group 1 arg in
-        let expr = Parse.parse_cli_expr (Str.matched_group 2 arg) in
-        env := Ast.Env.add name expr !env
-      )
-      else (
-        (* target *)
-        let expr = Parse.parse_cli_expr arg in
-        targets := expr :: !targets
-      )
-  ) args;
-  let targets = List.rev !targets and env = !env in
+  (* Parse the target expressions. *)
+  let targets = List.map Parse.parse_cli_expr Cmdline.targets in
 
   (* If no target was set on the command line, use "all ()". *)
   let targets =
@@ -117,4 +57,5 @@ let main () =
 let () =
   try main ()
   with
-    Failure msg -> prerr_endline msg; exit 1
+    Failure msg | Sys_error msg ->
+      prerr_endline ("error: " ^ msg); exit 1