From 95df71e6ce9ec3887f7e88accda7c9b29c538d86 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Mon, 25 Jul 2022 10:25:51 -0400
Subject: Add basic support for building C code

---
 Biz/Bild.hs        | 79 +++++++++++++++++++++++++++++++++++++++---------------
 Biz/Bild.nix       |  1 +
 Biz/Bild/Example.c |  6 +++++
 Biz/Namespace.hs   |  6 +++--
 4 files changed, 68 insertions(+), 24 deletions(-)
 create mode 100644 Biz/Bild/Example.c

diff --git a/Biz/Bild.hs b/Biz/Bild.hs
index d1d3d78..58bf8e6 100644
--- a/Biz/Bild.hs
+++ b/Biz/Bild.hs
@@ -202,6 +202,7 @@ type Out = String
 
 data Compiler
   = Copy
+  | Gcc
   | GhcLib
   | GhcExe
   | Guile
@@ -230,20 +231,29 @@ data Target = Target
 
 -- | We can't build everything yet...
 isBuildableNs :: Namespace -> Bool
-isBuildableNs (Namespace _ Namespace.Hs) = True
-isBuildableNs (Namespace _ Namespace.Lisp) = True
-isBuildableNs (Namespace _ Namespace.Scm) = True
-isBuildableNs (Namespace _ Namespace.Rs) = True
-isBuildableNs ns
-  | ns `elem` nixTargets = True
-  | otherwise = False
+isBuildableNs = \case
+  (Namespace _ Namespace.C) -> True
+  (Namespace _ Namespace.Css) -> False
+  (Namespace _ Namespace.Hs) -> True
+  (Namespace _ Namespace.Json) -> False
+  (Namespace _ Namespace.Keys) -> False
+  (Namespace _ Namespace.Lisp) -> True
+  (Namespace _ Namespace.Md) -> False
+  (Namespace _ Namespace.None) -> False
+  (Namespace _ Namespace.Py) -> False
+  (Namespace _ Namespace.Sh) -> False
+  (Namespace _ Namespace.Scm) -> True
+  (Namespace _ Namespace.Rs) -> True
+  (Namespace path Namespace.Nix)
+    | path `elem` nixTargets -> True
+    | otherwise -> False
   where
     nixTargets =
-      [ Namespace ["Biz", "Pie"] Namespace.Nix,
-        Namespace ["Biz", "Que"] Namespace.Nix,
-        Namespace ["Biz", "Cloud"] Namespace.Nix,
-        Namespace ["Biz", "Dev"] Namespace.Nix,
-        Namespace ["Biz", "Dragons", "Analysis"] Namespace.Nix
+      [ ["Biz", "Pie"],
+        ["Biz", "Que"],
+        ["Biz", "Cloud"],
+        ["Biz", "Dev"],
+        ["Biz", "Dragons", "Analysis"]
       ]
 
 -- | Emulate the *nix hierarchy in the cabdir.
@@ -318,7 +328,39 @@ analyze path = do
       Just </ do
         user <- Env.getEnv "USER" /> Text.pack
         host <- Text.pack </ fromMaybe "interactive" </ Env.lookupEnv "HOSTNAME"
+        let nada =
+              Target
+                { langdeps = Set.empty,
+                  sysdeps = Set.empty,
+                  compiler = Copy,
+                  out = Nothing,
+                  builder = user <> "@localhost",
+                  ..
+                }
         case ext of
+          -- basically we don't support building these
+          Namespace.Css -> pure nada
+          Namespace.Json -> pure nada
+          Namespace.Keys -> pure nada
+          Namespace.Md -> pure nada
+          Namespace.None -> pure nada
+          Namespace.Py -> pure nada
+          Namespace.Sh -> pure nada
+          Namespace.C -> do
+            pure
+              Target
+                { langdeps = Set.empty,
+                  sysdeps = Set.empty,
+                  compiler = Gcc,
+                  out =
+                    contentLines
+                      /> Text.unpack
+                      /> Regex.match (metaOut "//")
+                      |> catMaybes
+                      |> head,
+                  builder = user <> "@localhost",
+                  ..
+                }
           Namespace.Hs -> do
             langdeps <- detectImports namespace contentLines
             let out =
@@ -404,16 +446,6 @@ analyze path = do
                   builder = user <> "@localhost",
                   ..
                 }
-          _ ->
-            pure
-              Target
-                { langdeps = Set.empty,
-                  sysdeps = Set.empty,
-                  compiler = Copy,
-                  out = Nothing,
-                  builder = user <> "@localhost",
-                  ..
-                }
 
 ghcPkgFindModule :: Set String -> String -> IO (Set String)
 ghcPkgFindModule acc m = do
@@ -463,6 +495,9 @@ build :: Bool -> Bool -> Target -> IO Exit.ExitCode
 build andTest loud target@Target {..} = do
   root <- Env.getEnv "BIZ_ROOT"
   case compiler of
+    Gcc -> do
+      Log.info ["bild", "dev", "gcc", nschunk namespace]
+      proc loud namespace "gcc" ["-o", root </> bindir </> Maybe.fromJust out, path]
     GhcExe -> do
       Log.info ["bild", "dev", "ghc-exe", nschunk namespace]
       exitcode <-
diff --git a/Biz/Bild.nix b/Biz/Bild.nix
index 547ccb9..e7aaf7f 100644
--- a/Biz/Bild.nix
+++ b/Biz/Bild.nix
@@ -116,6 +116,7 @@ rec {
     name = "bizdev";
     # this should just be dev tools
     buildInputs = with nixpkgs.pkgs; [
+      gcc
       bild
       ctags
       figlet
diff --git a/Biz/Bild/Example.c b/Biz/Bild/Example.c
new file mode 100644
index 0000000..06e6ed8
--- /dev/null
+++ b/Biz/Bild/Example.c
@@ -0,0 +1,6 @@
+// : out helloworld.exe
+void
+main()
+{
+  printf("Biz/Bild/Example.c: Hello world!\n");
+}
diff --git a/Biz/Namespace.hs b/Biz/Namespace.hs
index 0fd861f..6fb40f7 100644
--- a/Biz/Namespace.hs
+++ b/Biz/Namespace.hs
@@ -24,7 +24,8 @@ import qualified Data.List.Split as List
 import qualified Text.Regex.Applicative as Regex
 
 data Ext
-  = Css
+  = C
+  | Css
   | Hs
   | Json
   | Keys
@@ -89,7 +90,8 @@ rePath = Regex.many (name <* Regex.string "/" <|> name)
 
 reExt :: Regex.RE Char Ext
 reExt =
-  Css <$ Regex.string "css"
+  C <$ Regex.string "c"
+    <|> Css <$ Regex.string "css"
     <|> Hs <$ Regex.string "hs"
     <|> Json <$ Regex.string "json"
     <|> Keys <$ Regex.string "pub"
-- 
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