Tidy up structure of briefcase

I had a spare fifteen minutes and decided that I should tidy up my
monorepo. The work of tidying up is not finished; this is a small step in the
right direction.

TL;DR
- Created a tools directory
- Created a scratch directory (see README.md for more information)
- Added README.md to third_party
- Renamed delete_dotfile_symlinks -> symlinkManager
- Packaged symlinkManager as an executable symlink-mgr using buildGo

89 files changed, 53 insertions, 41 deletions

diff --git a/default.nix b/default.nix
index 74268c803961..cf7e61e4a990 100644
--- a/default.nix
+++ b/default.nix
@@ -23,6 +23,7 @@ let
     gopkgs = readTree ./gopkgs;
     monzo_ynab = readTree ./monzo_ynab;
     third_party = readTree ./third_party;
+    tools = readTree ./tools;
   };
 in fix(self: {
   config = config self;
diff --git a/gopkgs/utils/utils.go b/gopkgs/utils/utils.go
index 53136878dea3..7d662d08668b 100644
--- a/gopkgs/utils/utils.go
+++ b/gopkgs/utils/utils.go
@@ -21,6 +21,11 @@ func HomeDir() string {
 	return user.HomeDir
 }
 
+// Returns true if `info` is a symlink.
+func IsSymlink(info os.FileMode) bool {
+	return info&os.ModeSymlink != 0
+}
+
 // Return true if `path` exists and false otherwise.
 func FileExists(path string) bool {
 	if _, err := os.Stat(path); os.IsNotExist(err) {
diff --git a/scratch/README.md b/scratch/README.md
new file mode 100644
index 000000000000..8259ac70d9b2
--- /dev/null
+++ b/scratch/README.md
@@ -0,0 +1,6 @@
+# Scratch
+
+The purpose of the `scratch` directory is to host practice exercises. Practice
+encompasses things like working on data structures and algorithms problems for
+upcoming coding interviews or general aptitude as well as writing code snippets
+to help me learn a new programming language or understand an unfamiliar concept.
diff --git a/crack_the_coding_interview/11_1.py b/scratch/crack_the_coding_interview/11_1.py
index ec7b65dae0c3..ec7b65dae0c3 100644
--- a/crack_the_coding_interview/11_1.py
+++ b/scratch/crack_the_coding_interview/11_1.py
diff --git a/crack_the_coding_interview/to_tree.hs b/scratch/crack_the_coding_interview/to_tree.hs
index 8496d88c0c0c..8496d88c0c0c 100644
--- a/crack_the_coding_interview/to_tree.hs
+++ b/scratch/crack_the_coding_interview/to_tree.hs
diff --git a/data_structures_and_algorithms/array-traversals.py b/scratch/data_structures_and_algorithms/array-traversals.py
index 35cb4392812e..35cb4392812e 100644
--- a/data_structures_and_algorithms/array-traversals.py
+++ b/scratch/data_structures_and_algorithms/array-traversals.py
diff --git a/data_structures_and_algorithms/balanced-binary-tree.py b/scratch/data_structures_and_algorithms/balanced-binary-tree.py
index 01fd965fd540..01fd965fd540 100644
--- a/data_structures_and_algorithms/balanced-binary-tree.py
+++ b/scratch/data_structures_and_algorithms/balanced-binary-tree.py
diff --git a/data_structures_and_algorithms/bit-manipulation.py b/scratch/data_structures_and_algorithms/bit-manipulation.py
index dc30bb508887..dc30bb508887 100644
--- a/data_structures_and_algorithms/bit-manipulation.py
+++ b/scratch/data_structures_and_algorithms/bit-manipulation.py
diff --git a/data_structures_and_algorithms/bracket-validator.py b/scratch/data_structures_and_algorithms/bracket-validator.py
index a50f8b074e55..a50f8b074e55 100644
--- a/data_structures_and_algorithms/bracket-validator.py
+++ b/scratch/data_structures_and_algorithms/bracket-validator.py
diff --git a/data_structures_and_algorithms/bst-checker.py b/scratch/data_structures_and_algorithms/bst-checker.py
index 689be97a8503..689be97a8503 100644
--- a/data_structures_and_algorithms/bst-checker.py
+++ b/scratch/data_structures_and_algorithms/bst-checker.py
diff --git a/data_structures_and_algorithms/cafe-order-checker.py b/scratch/data_structures_and_algorithms/cafe-order-checker.py
index e34a2b136ab6..e34a2b136ab6 100644
--- a/data_structures_and_algorithms/cafe-order-checker.py
+++ b/scratch/data_structures_and_algorithms/cafe-order-checker.py
diff --git a/data_structures_and_algorithms/cake-thief.py b/scratch/data_structures_and_algorithms/cake-thief.py
index 9eddb34b2db3..9eddb34b2db3 100644
--- a/data_structures_and_algorithms/cake-thief.py
+++ b/scratch/data_structures_and_algorithms/cake-thief.py
diff --git a/data_structures_and_algorithms/coins.py b/scratch/data_structures_and_algorithms/coins.py
index eb5754f98210..eb5754f98210 100644
--- a/data_structures_and_algorithms/coins.py
+++ b/scratch/data_structures_and_algorithms/coins.py
diff --git a/data_structures_and_algorithms/conways-game-of-life.py b/scratch/data_structures_and_algorithms/conways-game-of-life.py
index 3836bcd0c653..3836bcd0c653 100644
--- a/data_structures_and_algorithms/conways-game-of-life.py
+++ b/scratch/data_structures_and_algorithms/conways-game-of-life.py
diff --git a/data_structures_and_algorithms/delete-node.py b/scratch/data_structures_and_algorithms/delete-node.py
index 7e431e224962..7e431e224962 100644
--- a/data_structures_and_algorithms/delete-node.py
+++ b/scratch/data_structures_and_algorithms/delete-node.py
diff --git a/data_structures_and_algorithms/dft.py b/scratch/data_structures_and_algorithms/dft.py
index 127d48c1864b..127d48c1864b 100644
--- a/data_structures_and_algorithms/dft.py
+++ b/scratch/data_structures_and_algorithms/dft.py
diff --git a/data_structures_and_algorithms/dijkstra-shortest-path.py b/scratch/data_structures_and_algorithms/dijkstra-shortest-path.py
index 03907f604044..03907f604044 100644
--- a/data_structures_and_algorithms/dijkstra-shortest-path.py
+++ b/scratch/data_structures_and_algorithms/dijkstra-shortest-path.py
diff --git a/data_structures_and_algorithms/find-duplicate-optimize-for-space-beast.py b/scratch/data_structures_and_algorithms/find-duplicate-optimize-for-space-beast.py
index 93fdd9eed2d6..93fdd9eed2d6 100644
--- a/data_structures_and_algorithms/find-duplicate-optimize-for-space-beast.py
+++ b/scratch/data_structures_and_algorithms/find-duplicate-optimize-for-space-beast.py
diff --git a/data_structures_and_algorithms/find-duplicate-optimize-for-space.py b/scratch/data_structures_and_algorithms/find-duplicate-optimize-for-space.py
index e2739f0f6055..e2739f0f6055 100644
--- a/data_structures_and_algorithms/find-duplicate-optimize-for-space.py
+++ b/scratch/data_structures_and_algorithms/find-duplicate-optimize-for-space.py
diff --git a/data_structures_and_algorithms/find-rotation-point.py b/scratch/data_structures_and_algorithms/find-rotation-point.py
index 2103a5b84f75..2103a5b84f75 100644
--- a/data_structures_and_algorithms/find-rotation-point.py
+++ b/scratch/data_structures_and_algorithms/find-rotation-point.py
diff --git a/data_structures_and_algorithms/find-unique-int-among-duplicates.py b/scratch/data_structures_and_algorithms/find-unique-int-among-duplicates.py
index dfa5de42cc0b..dfa5de42cc0b 100644
--- a/data_structures_and_algorithms/find-unique-int-among-duplicates.py
+++ b/scratch/data_structures_and_algorithms/find-unique-int-among-duplicates.py
diff --git a/data_structures_and_algorithms/fixtures.py b/scratch/data_structures_and_algorithms/fixtures.py
index 27689ca76d04..27689ca76d04 100644
--- a/data_structures_and_algorithms/fixtures.py
+++ b/scratch/data_structures_and_algorithms/fixtures.py
diff --git a/data_structures_and_algorithms/graph-coloring.py b/scratch/data_structures_and_algorithms/graph-coloring.py
index bc7f7ceea562..bc7f7ceea562 100644
--- a/data_structures_and_algorithms/graph-coloring.py
+++ b/scratch/data_structures_and_algorithms/graph-coloring.py
diff --git a/data_structures_and_algorithms/graph-to-graphviz.py b/scratch/data_structures_and_algorithms/graph-to-graphviz.py
index 0e7e97a20ca7..0e7e97a20ca7 100644
--- a/data_structures_and_algorithms/graph-to-graphviz.py
+++ b/scratch/data_structures_and_algorithms/graph-to-graphviz.py
diff --git a/data_structures_and_algorithms/highest-product-of-3.py b/scratch/data_structures_and_algorithms/highest-product-of-3.py
index 889663e058da..889663e058da 100644
--- a/data_structures_and_algorithms/highest-product-of-3.py
+++ b/scratch/data_structures_and_algorithms/highest-product-of-3.py
diff --git a/data_structures_and_algorithms/inflight-entertainment.py b/scratch/data_structures_and_algorithms/inflight-entertainment.py
index 6e17baef3709..6e17baef3709 100644
--- a/data_structures_and_algorithms/inflight-entertainment.py
+++ b/scratch/data_structures_and_algorithms/inflight-entertainment.py
diff --git a/data_structures_and_algorithms/knapsack-0-1.py b/scratch/data_structures_and_algorithms/knapsack-0-1.py
index c72d19d4ed73..c72d19d4ed73 100644
--- a/data_structures_and_algorithms/knapsack-0-1.py
+++ b/scratch/data_structures_and_algorithms/knapsack-0-1.py
diff --git a/data_structures_and_algorithms/kth-to-last.py b/scratch/data_structures_and_algorithms/kth-to-last.py
index 8291e54533d5..8291e54533d5 100644
--- a/data_structures_and_algorithms/kth-to-last.py
+++ b/scratch/data_structures_and_algorithms/kth-to-last.py
diff --git a/data_structures_and_algorithms/largest-stack.py b/scratch/data_structures_and_algorithms/largest-stack.py
index aab9671eb6d3..aab9671eb6d3 100644
--- a/data_structures_and_algorithms/largest-stack.py
+++ b/scratch/data_structures_and_algorithms/largest-stack.py
diff --git a/data_structures_and_algorithms/linked-list-cycles.py b/scratch/data_structures_and_algorithms/linked-list-cycles.py
index 75a4b993944c..75a4b993944c 100644
--- a/data_structures_and_algorithms/linked-list-cycles.py
+++ b/scratch/data_structures_and_algorithms/linked-list-cycles.py
diff --git a/data_structures_and_algorithms/merge-sort.py b/scratch/data_structures_and_algorithms/merge-sort.py
index 6dbe0fa0f3c3..6dbe0fa0f3c3 100644
--- a/data_structures_and_algorithms/merge-sort.py
+++ b/scratch/data_structures_and_algorithms/merge-sort.py
diff --git a/data_structures_and_algorithms/merging-ranges.py b/scratch/data_structures_and_algorithms/merging-ranges.py
index 4e3604d5bcca..4e3604d5bcca 100644
--- a/data_structures_and_algorithms/merging-ranges.py
+++ b/scratch/data_structures_and_algorithms/merging-ranges.py
diff --git a/data_structures_and_algorithms/mesh-message.gv b/scratch/data_structures_and_algorithms/mesh-message.gv
index 1e67c3954f5f..1e67c3954f5f 100644
--- a/data_structures_and_algorithms/mesh-message.gv
+++ b/scratch/data_structures_and_algorithms/mesh-message.gv
diff --git a/data_structures_and_algorithms/mesh-message.py b/scratch/data_structures_and_algorithms/mesh-message.py
index c9d7d9d74151..c9d7d9d74151 100644
--- a/data_structures_and_algorithms/mesh-message.py
+++ b/scratch/data_structures_and_algorithms/mesh-message.py
diff --git a/data_structures_and_algorithms/norman.py b/scratch/data_structures_and_algorithms/norman.py
index 379ba92abba8..379ba92abba8 100644
--- a/data_structures_and_algorithms/norman.py
+++ b/scratch/data_structures_and_algorithms/norman.py
diff --git a/data_structures_and_algorithms/nth-fibonacci.py b/scratch/data_structures_and_algorithms/nth-fibonacci.py
index cdb2846ea338..cdb2846ea338 100644
--- a/data_structures_and_algorithms/nth-fibonacci.py
+++ b/scratch/data_structures_and_algorithms/nth-fibonacci.py
diff --git a/data_structures_and_algorithms/optimal-stopping.py b/scratch/data_structures_and_algorithms/optimal-stopping.py
index af13239941d0..af13239941d0 100644
--- a/data_structures_and_algorithms/optimal-stopping.py
+++ b/scratch/data_structures_and_algorithms/optimal-stopping.py
diff --git a/data_structures_and_algorithms/perm-tree.py b/scratch/data_structures_and_algorithms/perm-tree.py
index 0eb389c26bb9..0eb389c26bb9 100644
--- a/data_structures_and_algorithms/perm-tree.py
+++ b/scratch/data_structures_and_algorithms/perm-tree.py
diff --git a/data_structures_and_algorithms/permutation-palindrome.py b/scratch/data_structures_and_algorithms/permutation-palindrome.py
index 0a2136a408f2..0a2136a408f2 100644
--- a/data_structures_and_algorithms/permutation-palindrome.py
+++ b/scratch/data_structures_and_algorithms/permutation-palindrome.py
diff --git a/data_structures_and_algorithms/permutations.py b/scratch/data_structures_and_algorithms/permutations.py
index fc2c1ef7eebc..fc2c1ef7eebc 100644
--- a/data_structures_and_algorithms/permutations.py
+++ b/scratch/data_structures_and_algorithms/permutations.py
diff --git a/data_structures_and_algorithms/plot.py b/scratch/data_structures_and_algorithms/plot.py
index 5601891a0d9b..5601891a0d9b 100644
--- a/data_structures_and_algorithms/plot.py
+++ b/scratch/data_structures_and_algorithms/plot.py
diff --git a/data_structures_and_algorithms/product-of-other-numbers.py b/scratch/data_structures_and_algorithms/product-of-other-numbers.py
index d05e82d42b02..d05e82d42b02 100644
--- a/data_structures_and_algorithms/product-of-other-numbers.py
+++ b/scratch/data_structures_and_algorithms/product-of-other-numbers.py
diff --git a/data_structures_and_algorithms/queue-two-stacks.py b/scratch/data_structures_and_algorithms/queue-two-stacks.py
index 63da08ebf79a..63da08ebf79a 100644
--- a/data_structures_and_algorithms/queue-two-stacks.py
+++ b/scratch/data_structures_and_algorithms/queue-two-stacks.py
diff --git a/data_structures_and_algorithms/rectangular-love.py b/scratch/data_structures_and_algorithms/rectangular-love.py
index 47c0f53979c6..47c0f53979c6 100644
--- a/data_structures_and_algorithms/rectangular-love.py
+++ b/scratch/data_structures_and_algorithms/rectangular-love.py
diff --git a/data_structures_and_algorithms/recursive-string-permutations.py b/scratch/data_structures_and_algorithms/recursive-string-permutations.py
index 70461ddf5dac..70461ddf5dac 100644
--- a/data_structures_and_algorithms/recursive-string-permutations.py
+++ b/scratch/data_structures_and_algorithms/recursive-string-permutations.py
diff --git a/data_structures_and_algorithms/reverse-linked-list.py b/scratch/data_structures_and_algorithms/reverse-linked-list.py
index b7396b20ce3f..b7396b20ce3f 100644
--- a/data_structures_and_algorithms/reverse-linked-list.py
+++ b/scratch/data_structures_and_algorithms/reverse-linked-list.py
diff --git a/data_structures_and_algorithms/reverse-words.py b/scratch/data_structures_and_algorithms/reverse-words.py
index 5df12ebabdc7..5df12ebabdc7 100644
--- a/data_structures_and_algorithms/reverse-words.py
+++ b/scratch/data_structures_and_algorithms/reverse-words.py
diff --git a/data_structures_and_algorithms/second-largest-item-bst.py b/scratch/data_structures_and_algorithms/second-largest-item-bst.py
index bc167d975a7b..bc167d975a7b 100644
--- a/data_structures_and_algorithms/second-largest-item-bst.py
+++ b/scratch/data_structures_and_algorithms/second-largest-item-bst.py
diff --git a/data_structures_and_algorithms/shortest-path-inject-vertices.py b/scratch/data_structures_and_algorithms/shortest-path-inject-vertices.py
index e08ea66b8f50..e08ea66b8f50 100644
--- a/data_structures_and_algorithms/shortest-path-inject-vertices.py
+++ b/scratch/data_structures_and_algorithms/shortest-path-inject-vertices.py
diff --git a/data_structures_and_algorithms/shuffle.py b/scratch/data_structures_and_algorithms/shuffle.py
index bdfbad24263c..bdfbad24263c 100644
--- a/data_structures_and_algorithms/shuffle.py
+++ b/scratch/data_structures_and_algorithms/shuffle.py
diff --git a/data_structures_and_algorithms/string-reverse.py b/scratch/data_structures_and_algorithms/string-reverse.py
index 8b4cdac1c271..8b4cdac1c271 100644
--- a/data_structures_and_algorithms/string-reverse.py
+++ b/scratch/data_structures_and_algorithms/string-reverse.py
diff --git a/data_structures_and_algorithms/temperature-tracker.py b/scratch/data_structures_and_algorithms/temperature-tracker.py
index 6b042182f01c..6b042182f01c 100644
--- a/data_structures_and_algorithms/temperature-tracker.py
+++ b/scratch/data_structures_and_algorithms/temperature-tracker.py
diff --git a/data_structures_and_algorithms/test.txt b/scratch/data_structures_and_algorithms/test.txt
index ce013625030b..ce013625030b 100644
--- a/data_structures_and_algorithms/test.txt
+++ b/scratch/data_structures_and_algorithms/test.txt
diff --git a/data_structures_and_algorithms/top-scores.py b/scratch/data_structures_and_algorithms/top-scores.py
index 8e7b073dd8bd..8e7b073dd8bd 100644
--- a/data_structures_and_algorithms/top-scores.py
+++ b/scratch/data_structures_and_algorithms/top-scores.py
diff --git a/data_structures_and_algorithms/topo-sort.py b/scratch/data_structures_and_algorithms/topo-sort.py
index fe295b0279ff..fe295b0279ff 100644
--- a/data_structures_and_algorithms/topo-sort.py
+++ b/scratch/data_structures_and_algorithms/topo-sort.py
diff --git a/data_structures_and_algorithms/trickling-water.py b/scratch/data_structures_and_algorithms/trickling-water.py
index 45621990ecf9..45621990ecf9 100644
--- a/data_structures_and_algorithms/trickling-water.py
+++ b/scratch/data_structures_and_algorithms/trickling-water.py
diff --git a/data_structures_and_algorithms/which-appears-twice.py b/scratch/data_structures_and_algorithms/which-appears-twice.py
index e9a4f0eb24d0..e9a4f0eb24d0 100644
--- a/data_structures_and_algorithms/which-appears-twice.py
+++ b/scratch/data_structures_and_algorithms/which-appears-twice.py
diff --git a/deepmind/part_one/balanced-binary-tree.py b/scratch/deepmind/part_one/balanced-binary-tree.py
index 7fc174a2a9f3..7fc174a2a9f3 100644
--- a/deepmind/part_one/balanced-binary-tree.py
+++ b/scratch/deepmind/part_one/balanced-binary-tree.py
diff --git a/deepmind/part_one/dijkstra.py b/scratch/deepmind/part_one/dijkstra.py
index 6975dbe4d1d6..6975dbe4d1d6 100644
--- a/deepmind/part_one/dijkstra.py
+++ b/scratch/deepmind/part_one/dijkstra.py
diff --git a/deepmind/part_one/efficiency.org b/scratch/deepmind/part_one/efficiency.org
index 89a45c52ad8a..89a45c52ad8a 100644
--- a/deepmind/part_one/efficiency.org
+++ b/scratch/deepmind/part_one/efficiency.org
diff --git a/deepmind/part_one/find-rotation-point.py b/scratch/deepmind/part_one/find-rotation-point.py
index 5c21d5167ce9..5c21d5167ce9 100644
--- a/deepmind/part_one/find-rotation-point.py
+++ b/scratch/deepmind/part_one/find-rotation-point.py
diff --git a/deepmind/part_one/inflight-entertainment.py b/scratch/deepmind/part_one/inflight-entertainment.py
index 2116b27b0b97..2116b27b0b97 100644
--- a/deepmind/part_one/inflight-entertainment.py
+++ b/scratch/deepmind/part_one/inflight-entertainment.py
diff --git a/deepmind/part_one/kth-to-last.py b/scratch/deepmind/part_one/kth-to-last.py
index 5335e419f7ec..5335e419f7ec 100644
--- a/deepmind/part_one/kth-to-last.py
+++ b/scratch/deepmind/part_one/kth-to-last.py
diff --git a/deepmind/part_one/merging-ranges.py b/scratch/deepmind/part_one/merging-ranges.py
index 23b40793b8f1..23b40793b8f1 100644
--- a/deepmind/part_one/merging-ranges.py
+++ b/scratch/deepmind/part_one/merging-ranges.py
diff --git a/deepmind/part_one/recursive-string-permutations.py b/scratch/deepmind/part_one/recursive-string-permutations.py
index f50db2838707..f50db2838707 100644
--- a/deepmind/part_one/recursive-string-permutations.py
+++ b/scratch/deepmind/part_one/recursive-string-permutations.py
diff --git a/deepmind/part_one/reverse-linked-list.py b/scratch/deepmind/part_one/reverse-linked-list.py
index 82fac171d5d1..82fac171d5d1 100644
--- a/deepmind/part_one/reverse-linked-list.py
+++ b/scratch/deepmind/part_one/reverse-linked-list.py
diff --git a/deepmind/part_one/stock-price.py b/scratch/deepmind/part_one/stock-price.py
index 7055b66af196..7055b66af196 100644
--- a/deepmind/part_one/stock-price.py
+++ b/scratch/deepmind/part_one/stock-price.py
diff --git a/deepmind/part_one/which-appears-twice.py b/scratch/deepmind/part_one/which-appears-twice.py
index c01379295d32..c01379295d32 100644
--- a/deepmind/part_one/which-appears-twice.py
+++ b/scratch/deepmind/part_one/which-appears-twice.py
diff --git a/deepmind/part_two/.envrc b/scratch/deepmind/part_two/.envrc
index b80e28b4b815..b80e28b4b815 100644
--- a/deepmind/part_two/.envrc
+++ b/scratch/deepmind/part_two/.envrc
diff --git a/deepmind/part_two/delete-node.py b/scratch/deepmind/part_two/delete-node.py
index 4ed02ec30832..4ed02ec30832 100644
--- a/deepmind/part_two/delete-node.py
+++ b/scratch/deepmind/part_two/delete-node.py
diff --git a/deepmind/part_two/misc/matrix-traversals.py b/scratch/deepmind/part_two/misc/matrix-traversals.py
index 52354f990e11..52354f990e11 100644
--- a/deepmind/part_two/misc/matrix-traversals.py
+++ b/scratch/deepmind/part_two/misc/matrix-traversals.py
diff --git a/deepmind/part_two/package-lock.json b/scratch/deepmind/part_two/package-lock.json
index 94c89c5979c4..94c89c5979c4 100644
--- a/deepmind/part_two/package-lock.json
+++ b/scratch/deepmind/part_two/package-lock.json
diff --git a/deepmind/part_two/package.json b/scratch/deepmind/part_two/package.json
index c9ef307ca0ee..c9ef307ca0ee 100644
--- a/deepmind/part_two/package.json
+++ b/scratch/deepmind/part_two/package.json
diff --git a/deepmind/part_two/reverse-string-in-place.ts b/scratch/deepmind/part_two/reverse-string-in-place.ts
index d714dfef997f..d714dfef997f 100644
--- a/deepmind/part_two/reverse-string-in-place.ts
+++ b/scratch/deepmind/part_two/reverse-string-in-place.ts
diff --git a/deepmind/part_two/shell.nix b/scratch/deepmind/part_two/shell.nix
index 606dd7167f7c..606dd7167f7c 100644
--- a/deepmind/part_two/shell.nix
+++ b/scratch/deepmind/part_two/shell.nix
diff --git a/deepmind/part_two/todo.org b/scratch/deepmind/part_two/todo.org
index 510073e6e2cd..510073e6e2cd 100644
--- a/deepmind/part_two/todo.org
+++ b/scratch/deepmind/part_two/todo.org
diff --git a/third_party/README.md b/third_party/README.md
new file mode 100644
index 000000000000..29e498a37726
--- /dev/null
+++ b/third_party/README.md
@@ -0,0 +1,5 @@
+# third_party
+
+The `third_party` directory hosts Nix expressions that package software that I
+cannot or have not found in other Nix package repositorys like `nixpkgs` or
+`depot`.
diff --git a/rfcToKindle/LICENSE b/tools/rfcToKindle/LICENSE
index 7a4a3ea2424c..7a4a3ea2424c 100644
--- a/rfcToKindle/LICENSE
+++ b/tools/rfcToKindle/LICENSE
diff --git a/rfcToKindle/README.md b/tools/rfcToKindle/README.md
index e7b4fa841ef6..e7b4fa841ef6 100644
--- a/rfcToKindle/README.md
+++ b/tools/rfcToKindle/README.md
diff --git a/rfcToKindle/default.nix b/tools/rfcToKindle/default.nix
index 3bfa71f2896d..3bfa71f2896d 100644
--- a/rfcToKindle/default.nix
+++ b/tools/rfcToKindle/default.nix
diff --git a/rfcToKindle/main.go b/tools/rfcToKindle/main.go
index 0f4f2dd9ec4f..0f4f2dd9ec4f 100644
--- a/rfcToKindle/main.go
+++ b/tools/rfcToKindle/main.go
diff --git a/run/.envrc b/tools/run/.envrc
index b80e28b4b815..b80e28b4b815 100644
--- a/run/.envrc
+++ b/tools/run/.envrc
diff --git a/run/README.md b/tools/run/README.md
index d3cccecf910c..d3cccecf910c 100644
--- a/run/README.md
+++ b/tools/run/README.md
diff --git a/run/default.nix b/tools/run/default.nix
index 113491536ee5..113491536ee5 100644
--- a/run/default.nix
+++ b/tools/run/default.nix
diff --git a/run/main.go b/tools/run/main.go
index 04906ece91f7..04906ece91f7 100644
--- a/run/main.go
+++ b/tools/run/main.go
diff --git a/run/shell.nix b/tools/run/shell.nix
index 8b97f04ca446..8b97f04ca446 100644
--- a/run/shell.nix
+++ b/tools/run/shell.nix
diff --git a/tools/symlinkManager/README.md b/tools/symlinkManager/README.md
new file mode 100644
index 000000000000..b0fc58c8e989
--- /dev/null
+++ b/tools/symlinkManager/README.md
@@ -0,0 +1,14 @@
+# Dotfile Symlink Manager
+
+Find and delete all symlinks to the dotfiles defined in `$BRIEFCASE`.
+
+Oftentimes I corrupt the state of my configuration files. The intention with
+this script is to help me clean things up when this happens. An example workflow
+might look like:
+
+```shell
+> symlink-mgr --audit
+> symlink-mgr --seriously
+> briefcase # changes directory to $BRIEFCASE
+> make install
+```
diff --git a/tools/symlinkManager/default.nix b/tools/symlinkManager/default.nix
new file mode 100644
index 000000000000..6500991babb9
--- /dev/null
+++ b/tools/symlinkManager/default.nix
@@ -0,0 +1,15 @@
+{
+  depot ? import <depot> {},
+  briefcase ? import <briefcase> {},
+  ...
+}:
+
+depot.buildGo.program {
+  name = "symlink-mgr";
+  srcs = [
+    ./main.go
+  ];
+  deps = with briefcase.gopkgs; [
+    utils
+  ];
+}
diff --git a/scripts/delete_dotfile_symlinks.go b/tools/symlinkManager/main.go
index 497b2d57b8c1..5d133e37d97b 100644
--- a/scripts/delete_dotfile_symlinks.go
+++ b/tools/symlinkManager/main.go
@@ -1,21 +1,3 @@
-// Find and delete all symlinks to the dotfiles defined in $BRIEFCASE.
-//
-// Oftentimes I corrupt the state of my dotfiles. The intention with this script
-// is to write some tooling to help me better manage my dotfile cleanliness. An
-// example workflow might look like:
-//
-// ```shell
-// > go run delete_dotfile_symlinks.go --audit
-// > go run delete_dotfile_symlinks.go --seriously
-// > cd ..
-// > make install
-// ```
-//
-// Outstanding TODOs:
-// - Package this with <depot>buildGo.nix.
-// - How can this be run as script without `go run`? She-bang at the top?
-// - See TODOs within this package.
-
 package main
 
 import (
@@ -26,25 +8,9 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"utils"
 )
 
-// Wanted for go tooling:
-// 1. jump-to-def
-// 2. documentation at point
-// 3. autocompletion
-
-// TODO: Consider adding this to a utils.go package.
-func failOn(err error) {
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-
-// TODO: Consider adding this to a utils.go package.
-func isSymlink(m os.FileMode) bool {
-	return m&os.ModeSymlink != 0
-}
-
 var hostnames = map[string]string{
 	os.Getenv("DESKTOP"):  "desktop",
 	os.Getenv("LAPTOP"):   "work_laptop",
@@ -66,13 +32,13 @@ func main() {
 	}
 
 	home, err := os.UserHomeDir()
-	failOn(err)
+	utils.FailOn(err)
 	count := 0
 
 	err = filepath.Walk(home, func(path string, info os.FileInfo, err error) error {
-		if isSymlink(info.Mode()) {
+		if utils.IsSymlink(info.Mode()) {
 			dest, err := os.Readlink(path)
-			failOn(err)
+			utils.FailOn(err)
 
 			var predicate func(string) bool
 
@@ -80,7 +46,7 @@ func main() {
 				predicate = func(dest string) bool {
 					var hostname string
 					hostname, err = os.Hostname()
-					failOn(err)
+					utils.FailOn(err)
 					seeking, ok := hostnames[hostname]
 					if !ok {
 						log.Fatal(fmt.Sprintf("Hostname \"%s\" not supported in the hostnames map.", hostname))
@@ -99,14 +65,14 @@ func main() {
 				} else if *seriously {
 					fmt.Printf("rm %s\n", path)
 					err = os.Remove(path)
-					failOn(err)
+					utils.FailOn(err)
 				}
 				count += 1
 			}
 		}
 		return nil
 	})
-	failOn(err)
+	utils.FailOn(err)
 	if *audit {
 		fmt.Printf("Would have deleted %d symlinks.\n", count)
 	} else if *seriously {