Add tap-snapshot utility scripts.

server/merge-snap.js

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+const fs = require("fs");
+
+// This script takes a path to a .test.ts file, finds its equivalent snapshot file
+// and merges it with single-process-tap's snapshot file.
+
+const toMerge = process.argv[2];
+
+if (!toMerge) {
+	throw new Error("no argv passed to merge-snap. Can't merge with nothing.");
+}
+
+const BASE_FILE = "./tap-snapshots/src/test-utils/single-process-tap.ts.test.cjs";
+const NEW_FILE = `${toMerge.replace("tachi-server/src", "tachi-server/tap-snapshots/src")}.test.cjs`;
+
+const baseSet = require(BASE_FILE);
+
+const newSet = require(NEW_FILE);
+
+for (const [snapshotName, snapshotValue] of Object.entries(newSet)) {
+	baseSet[snapshotName] = snapshotValue;
+}
+
+
+function escapeBacktickString(str) {
+	return str.replace(/\`\$/, " ")
+}
+
+const cases = [];
+
+for (const [snapshotName, snapshotValue] of Object.entries(baseSet)) {
+	cases.push(`exports[\`${escapeBacktickString(snapshotName)}\`] = \`${escapeBacktickString(snapshotValue)}\`\n`)
+}
+
+let outFile = `
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+${cases.join("\n")}`
+
+fs.writeFileSync(BASE_FILE, outFile);
+fs.rmSync(NEW_FILE);

server/snap-single-file.sh

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+#! /bin/bash
+
+# This script is intended to be used as follows
+# ./snap-single-file.sh path/to/test.TAP_SNAPSHOT
+# This will result in that individual file being snapped.
+
+# Of course, we need to do this like this because we are abusing
+# single process tap to get our tests done faster.
+
+# Put us in the directory this script is in.
+cd "$(dirname "$0")" || exit 1
+
+# So, TAP wont exit when ran on a single file because we never close it.
+# This can be fixed another time, but until then I'm going to do this insane hack.
+onsigint()
+{
+	node ./merge-snap.js "$1"
+}
+
+# When we recieve a sigint, trap it and call our sigint handler.
+# of course, this is bash, so trap onsigint doesn't do what you want.
+# instead, we do 'onsigint "$@"', which means call onsigint with arguments like $1.
+trap 'onsigint "$@"' SIGINT
+
+# Snapshot the argument.
+TAP_SNAPSHOT=1 tap "$1"
+