Factor out param_decl and improvements to AST printing.

[goals.git] / src / main.ml

diff --git a/src/main.ml b/src/main.ml
index 30ba31f..33d91b6 100644 (file)
--- a/src/main.ml
+++ b/src/main.ml
@@ -19,11 +19,17 @@
 
 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 ...]
+ goals [-f Goalfile] ['var=value' ...] ['target' ...]
 
 For detailed help see goals(1).
 
@@ -31,25 +37,67 @@ Options:"
 
 let main () =
   (* Command line arguments. *)
+  let args = ref [] in
+  let directory = ref "." in
   let filename = ref "Goalfile" in
 
   let argspec = [
-    "-f",        Arg.Set_string filename,
-                 "filename Set name of Goalfile";
-    "--file",    Arg.Set_string filename,
-                 "filename Set name of Goalfile";
+    "-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";
   ] in
   let argspec = Arg.align argspec in
-  let args = ref [] in
   let anon_fun s = args := s :: !args in
   Arg.parse argspec anon_fun usage;
 
-  (*let args = List.rev !args in*)
+  let args = List.rev !args in
+  let directory = !directory in
   let filename = !filename in
 
   (* Parse the input file. *)
-  let file = Parse.parse_from_file filename in
+  let env = Parse.parse_goalfile filename in
+
+  (* Now we've read the input, change directory. *)
+  Sys.chdir directory;
+
+  (* 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
+
+  (* If no target was set on the command line, use "all ()". *)
+  let targets =
+    if targets <> [] then targets
+    else [Ast.ECall (Ast.noloc, "all", [])] in
+
+  Ast.print_env stderr env;
 
-  Ast.print_file stdout file
+  (* Evaluate the target expressions in turn. *)
+  Eval.evaluate_targets env targets
 
-let () = main ()
+let () =
+  try main ()
+  with
+    Failure msg -> prerr_endline msg; exit 1