Massive ackbuilder refactor --- cleaner and more expressive. Lists

are automatically flattened (leading to better build files), and the
list and filename functions are vastly more orthogonal.

util/LLgen/build.lua

@@ -21,7 +21,7 @@ definerule("llgen",
 	function(e)
 		-- Remember this is executed from the caller's directory; local
 		-- target names will resolve there
-		local fs = replace(basename(e.srcs), "%.g$", "")
+		local fs = replace(basename(filenamesof(e.srcs)), "%.g$", "")
 
 		return normalrule {
 			name = e.name,
@@ -29,11 +29,11 @@ definerule("llgen",
 			outleaves = {
 				"Lpars.c",
 				"Lpars.h",
-				unpack(replace(fs, "$", ".c"))
+				replace(fs, "$", ".c")
 			},
 			ins = {
 				"util/LLgen+llgen",
-				unpack(e.srcs),
+				e.srcs,
 			},
 			commands = {
 				"cd %{dir} && %{abspath(ins)}"

util/cmisc/build.lua

@@ -8,13 +8,13 @@ definerule("tabgen",
 		srcs = { type="targets" },
 	},
 	function(e)
-		local symname = replace(basename(e.srcs[1]), "%.tab$", "")
+		local symname = basename(filenamesof(e.srcs)[1]):gsub("%.tab$", "")
 
 		return normalrule {
 			name = e.name,
 			ins = {
 				"util/cmisc+tabgen",
-				unpack(e.srcs)
+				e.srcs
 			},
 			outleaves = { symname..".c" },
 			commands = {

util/data/build.lua

@@ -24,7 +24,7 @@ clibrary {
 	name = "em_data",
 	srcs = concat(
 		"./em_ptyp.c",
-		filenamesof(generated, "%.c$")
+		matching(filenamesof(generated), "%.c$")
 	),
 	hdrs = {
 		"+generated" -- so we export the H files

util/ncgg/build.lua

@@ -12,11 +12,11 @@ local cgglexer = flex {
 
 normalrule {
 	name = "keywords",
-	ins = concat(
+	ins = {
 		"./cvtkeywords",
 		"./keywords",
-		filenamesof({cggparser}, "%.h$")
-	),
+		matching(filenamesof(cggparser), "%.h$")
+	},
 	outleaves = { "enterkeyw.c" },
 	commands = {
 		"%{ins[1]} %{ins[2]} %{ins[3]} %{outs[1]}"
@@ -27,8 +27,8 @@ cprogram {
 	name = "ncgg",
 	srcs = concat(
 		"./*.c",
-		filenamesof({cggparser}, "%.c$"),
-		filenamesof({cgglexer}, "%.c$"),
+		matching(filenamesof(cggparser), "%.c$"),
+		matching(filenamesof(cgglexer), "%.c$"),
 		"+keywords"
 	),
 	deps = {