std/all: Generate list. (#186)

I noticed that `rand` was missing, so...

std/all/all.go

@@ -2,11 +2,4 @@
 // standard library, thus registering it with std.Import.
 package all
 
-import (
-	_ "github.com/DeedleFake/wdte/std/arrays"
-	_ "github.com/DeedleFake/wdte/std/io"
-	_ "github.com/DeedleFake/wdte/std/io/file"
-	_ "github.com/DeedleFake/wdte/std/math"
-	_ "github.com/DeedleFake/wdte/std/stream"
-	_ "github.com/DeedleFake/wdte/std/strings"
-)
+//go:generate bash gen.bash -o gen.go -p all

std/all/gen.bash

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+out=/dev/stdout
+pkgname='all'
+
+while [ -n "$1" ]; do
+	case "$1" in
+		-o)
+			shift
+			out="$1"
+			;;
+
+		-p)
+			shift
+			pkgname="$1"
+			;;
+
+		*)
+			echo "Unrecognized argument: $1"
+			exit 2
+			;;
+	esac
+
+	shift
+done
+
+pkgs=$(cd .. && find . -type d -mindepth 1 | grep -v '\./all')
+
+echo "package $pkgname" > $out
+echo >> $out
+echo "import (" >> $out
+for pkg in $pkgs; do
+	echo "	_ \"github.com/DeedleFake/wdte/std/$(echo "$pkg" | cut -c3-)\""
+done | sort >> $out
+echo ")" >> $out

std/all/gen.go

@@ -0,0 +1,11 @@
+package all
+
+import (
+	_ "github.com/DeedleFake/wdte/std/arrays"
+	_ "github.com/DeedleFake/wdte/std/io"
+	_ "github.com/DeedleFake/wdte/std/io/file"
+	_ "github.com/DeedleFake/wdte/std/math"
+	_ "github.com/DeedleFake/wdte/std/rand"
+	_ "github.com/DeedleFake/wdte/std/stream"
+	_ "github.com/DeedleFake/wdte/std/strings"
+)