Added testing ability

For the full details, see patches/README.md :-)

patches/01_hello.patch

@@ -0,0 +1,4 @@
+19c19
+< fn main() void {
+---
+> pub fn main() void {

patches/02_std.patch

@@ -0,0 +1,4 @@
+14c14
+< ??? = @import("std");
+---
+> const std = @import("std");

patches/03_assignment.patch

@@ -0,0 +1 @@
+

patches/04_arrays.patch

@@ -0,0 +1 @@
+

patches/05_arrays2.patch

@@ -0,0 +1 @@
+

patches/06_strings.patch

@@ -0,0 +1 @@
+

patches/07_strings2.patch

@@ -0,0 +1 @@
+

patches/08_quiz.patch

@@ -0,0 +1 @@
+

patches/09_if.patch

@@ -0,0 +1 @@
+

patches/10_if2.patch

@@ -0,0 +1 @@
+

patches/11_while.patch

@@ -0,0 +1 @@
+

patches/12_while2.patch

@@ -0,0 +1 @@
+

patches/13_while3.patch

@@ -0,0 +1 @@
+

patches/14_while4.patch

@@ -0,0 +1 @@
+

patches/15_for.patch

@@ -0,0 +1 @@
+

patches/16_for2.patch

@@ -0,0 +1 @@
+

patches/17_quiz2.patch

@@ -0,0 +1 @@
+

patches/18_functions.patch

@@ -0,0 +1 @@
+

patches/19_functions2.patch

@@ -0,0 +1 @@
+

patches/20_quiz3.patch

@@ -0,0 +1 @@
+

patches/21_errors.patch

@@ -0,0 +1 @@
+

patches/22_errors2.patch

@@ -0,0 +1 @@
+

patches/23_errors3.patch

@@ -0,0 +1 @@
+

patches/24_errors4.patch

@@ -0,0 +1 @@
+

patches/25_errors5.patch

@@ -0,0 +1 @@
+

patches/26_hello2.patch

@@ -0,0 +1 @@
+

patches/27_defer.patch

@@ -0,0 +1 @@
+

patches/28_defer2.patch

@@ -0,0 +1 @@
+

patches/29_errdefer.patch

@@ -0,0 +1 @@
+

patches/30_switch.patch

@@ -0,0 +1 @@
+

patches/31_switch2.patch

@@ -0,0 +1 @@
+

patches/32_unreachable.patch

@@ -0,0 +1 @@
+

patches/33_iferror.patch

@@ -0,0 +1 @@
+

patches/34_quiz4.patch

@@ -0,0 +1 @@
+

patches/35_enums.patch

@@ -0,0 +1 @@
+

patches/36_enums2.patch

@@ -0,0 +1 @@
+

patches/37_structs.patch

@@ -0,0 +1 @@
+

patches/38_structs2.patch

@@ -0,0 +1 @@
+

patches/39_pointers.patch

@@ -0,0 +1 @@
+

patches/40_pointers2.patch

@@ -0,0 +1 @@
+

patches/41_pointers3.patch

@@ -0,0 +1 @@
+

patches/42_pointers4.patch

@@ -0,0 +1 @@
+

patches/43_pointers5.patch

@@ -0,0 +1 @@
+

patches/44_quiz5.patch

@@ -0,0 +1 @@
+

patches/README.md

@@ -1,9 +1,35 @@
-# The ziglings/patches Directory
+# No Peeking! :-)
 
-This is how ziglings is tested.
+Welcome to the ziglings/patches directory. This is how ziglings is tested.
 
-The patches fix the broken exercises so that they work again.
+The patches fix the broken exercises so that they work again, which means the
+answers are here, so no peeking!
 
-No peeking! :-)
+## Éowyn
+
+A Bash shell script named `eowyn.sh` dwells here. She heals the little broken
+programs and places them in a `healed` directory, which is not committed to the
+repo.
+
+```bash
+$ ./eowyn.sh
+```
+
+(If you invoke her from elsewhere, she'll come here to ply her trade.)
+
+The `build.zig` build script at the heart of Ziglings has a top-secret option
+which tells it to test from the `patches/healed/` dir rather than `exercises/`:
+
+```bash
+$ zig build -Dhealed [step]
+```
+
+Éowyn tests all healed programs using this secret option.
+
+
+## Gollum
+
+Another Bash shell script named `gollum.sh` may also be found. He snatches the
+original answers and stows them in his secret answers stash. If you leave him
+alone, he'll leave you alone.
 
-(Further tooling and explanation goes here.)

patches/eowyn.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+#
+#     "I will be a shieldmaiden no longer,
+#      nor vie with the great Riders, nor
+#      take joy only in the songs of slaying.
+#      I will be a healer, and love all things
+#      that grow and are not barren."
+#             Éowyn, The Return of the King
+#
+#
+# This script shall heal the little broken programs
+# using the patches in this directory and convey them
+# to convalesce in the healed directory.
+#
+
+# We run from the patches dir. Go there now if not already.
+cd $(dirname $(which $0))
+pwd # Show it upon the screen so all shall be made apparent.
+
+# Create healed/ directory here if it doesn't already exist.
+mkdir -p healed
+
+# Cycle through all the little broken Zig applications.
+for broken in ../exercises/*.zig
+do
+    # Remove the dir and extension, rendering the True Name.
+    true_name=$(basename $broken .zig)
+
+    if [[ -f $true_name.patch ]]
+    then
+        # Apply the bandages to the wounds, grow new limbs, let
+        # new life spring into the broken bodies of the fallen.
+        echo Healing $true_name...
+        patch --output=healed/$true_name.zig $broken $true_name.patch
+    else
+        echo Cannot heal $true_name. Making empty patch.
+        echo > $true_name.patch
+    fi
+done
+
+# Return to the home of our ancestors.
+cd ..
+
+# Test the healed exercises. May the compiler have mercy upon us.
+zig build -Dhealed

patches/gollum.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+#
+#     "It isn't fair, my precious, is it,
+#      to ask us what it's got in it's
+#      nassty little pocketsess?"
+#             Gollum, The Hobbit, or There and Back Again 
+#
+
+cd $(dirname $(which $0))
+f=$(basename ../exercises/$1*.zig .zig 2> /dev/null)
+b=../exercises/$f.zig
+a=../answers/$f.zig
+p=$f.patch
+
+printf "\tf: '$f'\n\tb: '$b'\n\ta: '$a'\n"
+
+if [[ ! -f $b ]]; then echo "We hates it!"; exit 1; fi
+if [[ ! -a $a ]]; then echo "Where is it? Where is the answer, precious?"; exit; fi
+
+echo Hisssss!
+
+diff $b $a > $p
+
+cat $p