Initial project structure

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diff --git a/.gitignore b/.gitignore
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+++ b/.gitignore
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+/doc/*.[0-9]
diff --git a/.tdrc b/.tdrc
new file mode 100644
index 0000000..c30c6ee
--- /dev/null
+++ b/.tdrc
@@ -0,0 +1 @@
+TD_USE_BUILTIN_HOOKS='git'
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..be3f7b2
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f590e16
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,134 @@
+.POSIX:
+DATE         = 1970-01-01
+VERSION      = 0.1.0
+NAME         = papo
+NAME_UC      = $(NAME)
+URL          = papo.im
+LIST         = list@$(URL)
+TRANSLATIONS =
+## Installation prefix.  Defaults to "/usr".
+PREFIX       = /usr
+BINDIR       = $(PREFIX)/bin
+LIBDIR       = $(PREFIX)/lib
+JSLIBDIR     = $(LIBDIR)/$(NAME)
+SHAREDIR     = $(PREFIX)/share
+LOCALEDIR    = $(SHAREDIR)/locale
+MANDIR       = $(SHAREDIR)/man
+## Where to store the installation.  Empty by default.
+DESTDIR      =
+JSIMPL       = node
+
+
+
+.SUFFIXES:
+.SUFFIXES: .in
+
+.in:
+	sed \
+		-e 's:@VERSION@:$(VERSION):g' \
+		-e 's:@DATE@:$(DATE):g'       \
+		-e 's:@NAME@:$(NAME):g'       \
+		-e 's:@LIST@:$(LIST):g'       \
+		-e 's:@URL@:$(URL):g'         \
+		< $< > $@
+	if [ -x $< ]; then chmod +x $@; fi
+
+
+
+manpages.en.in = \
+	doc/$(NAME).README.en.7.in    \
+	doc/$(NAME).CHANGELOG.en.7.in \
+	doc/$(NAME).TODOs.en.7.in     \
+	doc/$(NAME).en.1.in           \
+	doc/$(NAME).tutorial.en.7.in  \
+	doc/$(NAME).recipes.en.7.in   \
+	doc/$(NAME).why.en.7.in
+manpages.in = $(manpages.en.in)
+manpages = $(manpages.in:.in=)
+
+sources.js = \
+	src/compat.js     \
+	src/utils.js      \
+	src/server/web.js \
+	src/client.js     \
+
+tests.js = \
+	tests/js/compat.js     \
+	tests/js/utils.js      \
+	tests/js/server/web.js \
+
+
+sources = \
+	$(sources.js) \
+
+
+derived-assets = \
+	$(manpages) \
+
+
+
+## Default target.  Builds all artifacts required for testing
+## and installation.
+all: $(derived-assets)
+
+
+$(manpages): Makefile
+
+
+
+.SUFFIXES: .js .js-t
+tests.js-t = $(tests.js:.js=.js-t)
+$(tests.js-t):
+	$(JSIMPL) tests/runner.js $*.js
+
+check-t: $(tests.js-t)
+
+
+
+## Run all tests.  Each test suite is isolated, so that a parallel
+## build can run tests at the same time.  The required artifacts
+## are created if required.
+check: check-t
+
+
+## Remove *all* derived artifacts produced during the build.
+## A dedicated test asserts that this is always true.
+clean:
+	rm -rf $(derived-assets)
+
+
+## Installs into $(DESTDIR)$(PREFIX).  Its dependency target
+## ensures that all installable artifacts are crafted beforehand.
+install: all
+	mkdir -p \
+		'$(DESTDIR)$(BINDIR)'
+	cp src/bin/$(NAME) '$(DESTDIR)$(BINDIR)'
+	sh tools/manpages.sh -ip '$(DESTDIR)$(MANDIR)' $(manpages)
+
+## Uninstalls from $(DESTDIR)$(PREFIX).  This is a perfect mirror
+## of the "install" target, and removes *all* that was installed.
+## A dedicated test asserts that this is always true.
+uninstall:
+	rm -f \
+		'$(DESTDIR)$(BINDIR)'/$(NAME)
+	sh tools/manpages.sh -up '$(DESTDIR)$(MANDIR)' $(manpages)
+
+
+run-ircd:
+	$(JSIMPL) src/server/web.js server -l http://localhost:3000
+
+run-web:
+	$(JSIMPL) src/server/web.js server -l http://localhost:3003
+
+## Run the web and IRC server locally
+run:
+	$(MAKE) run-ircd & $(MAKE) run-web & wait
+
+
+MAKEFILE = Makefile
+## Show this help.
+help:
+	cat $(MAKEFILE) | sh tools/makehelp.sh
+
+
+ALWAYS:
diff --git a/TODOs.md b/TODOs.md
new file mode 100644
index 0000000..1c06aa1
--- /dev/null
+++ b/TODOs.md
@@ -0,0 +1,19 @@
+# Tasks
+
+
+# Bugs
+
+
+# Improvements
+
+
+# Questions
+
+
+# Decisions
+
+
+# Resources
+
+
+# Scratch
diff --git a/description b/description
new file mode 100644
index 0000000..500e922
--- /dev/null
+++ b/description
@@ -0,0 +1 @@
+Team chat software built on interoperable open standards
diff --git a/doc/favicon.svg b/doc/favicon.svg
new file mode 100644
index 0000000..ce566b2
--- /dev/null
+++ b/doc/favicon.svg
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16" width="16" height="16">
+  <path d="M 0  8  L 1  8  L 1  9  L 0  9  L 0  8  Z" />
+  <path d="M 0  13 L 1  13 L 1  14 L 0  14 L 0  13 Z" />
+  <path d="M 1  8  L 2  8  L 2  9  L 1  9  L 1  8  Z" />
+  <path d="M 1  13 L 2  13 L 2  14 L 1  14 L 1  13 Z" />
+  <path d="M 2  8  L 3  8  L 3  9  L 2  9  L 2  8  Z" />
+  <path d="M 2  13 L 3  13 L 3  14 L 2  14 L 2  13 Z" />
+  <path d="M 3  8  L 4  8  L 4  9  L 3  9  L 3  8  Z" />
+  <path d="M 3  13 L 4  13 L 4  14 L 3  14 L 3  13 Z" />
+  <path d="M 4  7  L 5  7  L 5  8  L 4  8  L 4  7  Z" />
+  <path d="M 4  8  L 5  8  L 5  9  L 4  9  L 4  8  Z" />
+  <path d="M 4  13 L 5  13 L 5  14 L 4  14 L 4  13 Z" />
+  <path d="M 5  6  L 6  6  L 6  7  L 5  7  L 5  6  Z" />
+  <path d="M 5  7  L 6  7  L 6  8  L 5  8  L 5  7  Z" />
+  <path d="M 5  13 L 6  13 L 6  14 L 5  14 L 5  13 Z" />
+  <path d="M 6  5  L 7  5  L 7  6  L 6  6  L 6  5  Z" />
+  <path d="M 6  6  L 7  6  L 7  7  L 6  7  L 6  6  Z" />
+  <path d="M 6  14 L 7  14 L 7  15 L 6  15 L 6  14 Z" />
+  <path d="M 7  1  L 8  1  L 8  2  L 7  2  L 7  1  Z" />
+  <path d="M 7  14 L 8  14 L 8  15 L 7  15 L 7  14 Z" />
+  <path d="M 7  15 L 8  15 L 8  16 L 7  16 L 7  15 Z" />
+  <path d="M 7  2  L 8  2  L 8  3  L 7  3  L 7  2  Z" />
+  <path d="M 7  3  L 8  3  L 8  4  L 7  4  L 7  3  Z" />
+  <path d="M 7  4  L 8  4  L 8  5  L 7  5  L 7  4  Z" />
+  <path d="M 7  5  L 8  5  L 8  6  L 7  6  L 7  5  Z" />
+  <path d="M 8  1  L 9  1  L 9  2  L 8  2  L 8  1  Z" />
+  <path d="M 8  15 L 9  15 L 9  16 L 8  16 L 8  15 Z" />
+  <path d="M 9  1  L 10 1  L 10 2  L 9  2  L 9  1  Z" />
+  <path d="M 9  2  L 10 2  L 10 3  L 9  3  L 9  2  Z" />
+  <path d="M 9  6  L 10 6  L 10 7  L 9  7  L 9  6  Z" />
+  <path d="M 9  15 L 10 15 L 10 16 L 9  16 L 9  15 Z" />
+  <path d="M 10 2  L 11 2  L 11 3  L 10 3  L 10 2  Z" />
+  <path d="M 10 3  L 11 3  L 11 4  L 10 4  L 10 3  Z" />
+  <path d="M 10 4  L 11 4  L 11 5  L 10 5  L 10 4  Z" />
+  <path d="M 10 5  L 11 5  L 11 6  L 10 6  L 10 5  Z" />
+  <path d="M 10 6  L 11 6  L 11 7  L 10 7  L 10 6  Z" />
+  <path d="M 11 6  L 12 6  L 12 7  L 11 7  L 11 6  Z" />
+  <path d="M 11 8  L 12 8  L 12 9  L 11 9  L 11 8  Z" />
+  <path d="M 10 15 L 11 15 L 11 16 L 10 16 L 10 15 Z" />
+  <path d="M 11 10 L 12 10 L 12 11 L 11 11 L 11 10 Z" />
+  <path d="M 11 12 L 12 12 L 12 13 L 11 13 L 11 12 Z" />
+  <path d="M 11 14 L 12 14 L 12 15 L 11 15 L 11 14 Z" />
+  <path d="M 11 15 L 12 15 L 12 16 L 11 16 L 11 15 Z" />
+  <path d="M 12 6  L 13 6  L 13 7  L 12 7  L 12 6  Z" />
+  <path d="M 12 8  L 13 8  L 13 9  L 12 9  L 12 8  Z" />
+  <path d="M 12 10 L 13 10 L 13 11 L 12 11 L 12 10 Z" />
+  <path d="M 12 12 L 13 12 L 13 13 L 12 13 L 12 12 Z" />
+  <path d="M 12 14 L 13 14 L 13 15 L 12 15 L 12 14 Z" />
+  <path d="M 13 6  L 14 6  L 14 7  L 13 7  L 13 6  Z" />
+  <path d="M 13 8  L 14 8  L 14 9  L 13 9  L 13 8  Z" />
+  <path d="M 13 10 L 14 10 L 14 11 L 13 11 L 13 10 Z" />
+  <path d="M 13 12 L 14 12 L 14 13 L 13 13 L 13 12 Z" />
+  <path d="M 13 13 L 14 13 L 14 14 L 13 14 L 13 13 Z" />
+  <path d="M 13 14 L 14 14 L 14 15 L 13 15 L 13 14 Z" />
+  <path d="M 14 7  L 15 7  L 15 8  L 14 8  L 14 7  Z" />
+  <path d="M 14 8  L 15 8  L 15 9  L 14 9  L 14 8  Z" />
+  <path d="M 14 9  L 15 9  L 15 10 L 14 10 L 14 9  Z" />
+  <path d="M 14 10 L 15 10 L 15 11 L 14 11 L 14 10 Z" />
+  <path d="M 14 11 L 15 11 L 15 12 L 14 12 L 14 11 Z" />
+  <path d="M 14 12 L 15 12 L 15 13 L 14 13 L 14 12 Z" />
+</svg>
diff --git a/doc/papo.CHANGELOG.en.7.in b/doc/papo.CHANGELOG.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.CHANGELOG.en.7.in
diff --git a/doc/papo.README.en.7.in b/doc/papo.README.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.README.en.7.in
diff --git a/doc/papo.TODOs.en.7.in b/doc/papo.TODOs.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.TODOs.en.7.in
diff --git a/doc/papo.en.1.in b/doc/papo.en.1.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.en.1.in
diff --git a/doc/papo.recipes.en.7.in b/doc/papo.recipes.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.recipes.en.7.in
diff --git a/doc/papo.tutorial.en.7.in b/doc/papo.tutorial.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.tutorial.en.7.in
diff --git a/doc/papo.why.en.7.in b/doc/papo.why.en.7.in
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/doc/papo.why.en.7.in
diff --git a/long-description b/long-description
new file mode 100644
index 0000000..21f8143
--- /dev/null
+++ b/long-description
@@ -0,0 +1,21 @@
+Papo is team collaboration platform composed of a suite of free and open source
+software made for communities and companies.  It features chat messaging, file
+sharing and virtual workspaces for working online together.
+
+Papo improves on existing solutions by:
+
+1. offering glossy UI for the needs of modern users;
+2. being built on existing stabilished standards, enabling existing workflows
+   and infrastruture to interoperate, instead of creating yet another ad-hoc
+   messaging API;
+3. being 100% free-software, down to the server configuration files and its
+   acompanying guides on how to use, customize or self-host, eliminating all
+   forms of lock-in;
+4. offering a hosted option at `https://papo.im` for those who whish to pay for
+   a managed service that is as transparent as possible.
+
+Underneath all of this, is just plain old IRC.  Not "a compatibility layer to
+IRC", just IRC.  Most of "modern" functionalities are available via the "modern"
+option which implements IRCv3 plus a couple of extensions, and there's also a
+"classic" ircd option with traditional RFC 1459 capabilities which serves as a
+replacement to other traditional ircd implementations.
diff --git a/tests/js/compat.js b/tests/js/compat.js
new file mode 100644
index 0000000..8eaf4f3
--- /dev/null
+++ b/tests/js/compat.js
@@ -0,0 +1,17 @@
+import { getJSImpl } from "../../src/compat.js";
+
+const test_getJSImpl = t => {
+	t.start("getJSImpl()");
+	// FIXME
+};
+
+const test_mappings = t => {
+	t.start("mappings");
+	// FIXME
+};
+
+
+export const tests = [
+	test_getJSImpl,
+	test_mappings,
+];
diff --git a/tests/js/server/web.js b/tests/js/server/web.js
new file mode 100644
index 0000000..ecc6b2e
--- /dev/null
+++ b/tests/js/server/web.js
@@ -0,0 +1,12 @@
+import { f } from "../../../src/server/web.js";
+
+const test_f = t => {
+	t.start("f()");
+	t.test("it returns the correct answer", () => {
+		t.assertEq(42, f());
+	});
+};
+
+export const tests = [
+	test_f,
+];
diff --git a/tests/js/utils.js b/tests/js/utils.js
new file mode 100644
index 0000000..1ecc0a4
--- /dev/null
+++ b/tests/js/utils.js
@@ -0,0 +1,135 @@
+import { eq, keys } from "../../src/utils.js";
+
+const test_eq = t => {
+	t.start("eq()");
+	t.test("scalar values equality", () => {
+		t.assert(eq(0, 0));
+		t.assert(eq(100, 100));
+		t.assert(eq(1.5, 1.5));
+		t.assert(eq(-9, -9));
+
+		t.assert(!eq(0, 1));
+		t.assert(!eq(100, 99));
+		t.assert(!eq(1.5, 1.4));
+		t.assert(!eq(-9, 9));
+
+
+		t.assert(eq(null, null));
+		t.assert(eq(undefined, undefined));
+		t.assert(eq("", ""));
+		t.assert(eq("a string", "a string"));
+
+		t.assert(!eq(null, undefined));
+		t.assert(!eq(undefined, 0));
+		t.assert(!eq("", "0"));
+		t.assert(!eq("a string", "another string"));
+
+
+		t.assert(eq(true, true));
+		t.assert(eq(false, false));
+
+		t.assert(!eq(true, false));
+
+
+		t.assert(eq(1n, 1n));
+		t.assert(eq(99999999999999n, 99999999999999n));
+
+		// t.assert(eq(1, 1n));
+	});
+
+	t.test("array equality", () => {
+		t.assert(eq([], []));
+
+
+		t.assert(eq([0, 1, 2], [0, 1, 2]));
+		t.assert(eq([0, 1, 2], new Array(0, 1, 2)));
+
+		t.assert(!eq([0, 1, 2], [0, 1]));
+		t.assert(!eq([0, 1], new Array(0, 1, 2)));
+
+
+		t.assert(eq([undefined], [undefined]));
+		t.assert(eq([null, 0, "", true], [null, 0, "", true]));
+
+
+		t.assert(eq([[[[0]]]], [[[[0]]]]));
+
+		t.assert(!eq([[[[0]]]], [0]));
+	});
+
+	t.test("object equality", () => {
+		t.assert(eq({}, {}));
+		t.assert(eq({ a: 1 }, { a: 1 }));
+
+		t.assert(!eq({ a: 1, b: undefined }, { a: 1 }));
+
+
+		t.assert(eq(
+			{ a: 1, b: { c: { d: "e" } } },
+			{ a: 1, b: { c: { d: "e" } } },
+		));
+
+		class C {}
+		// ...
+	});
+
+	t.test("mixed values", () => {
+		t.assert(eq(
+			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
+			{a: ["", 1, 2, 3, [{ b: { c: [ "d", "e" ]}}]]},
+		));
+
+		t.assert(!eq(null, {}));
+
+		t.assert(!eq([], {}));
+
+
+		t.assert(eq(new Date(123), new Date(123)));
+		t.assert(eq({ d: new Date(123) }, { d: new Date(123) }));
+
+		// FIXME
+		// t.assert(!eq(new Date(123), new Date(321)));
+		// t.assert(!eq({ d: new Date(123) }, { d: new Date(321) }));
+	});
+};
+
+const test_keys = t => {
+	t.start("keys()");
+	t.test("happy paths", () => {
+		t.assertEq(
+			{ a: 1, b: 2 },
+			keys(["a", "b"], { a: 1, b: 2, c: 3 }),
+		);
+	});
+
+	t.test("stress scenarios", () => {
+		t.assertEq(
+			{},
+			keys([], {}),
+			"empty selection of empty object",
+		);
+
+		t.assertEq(
+			{},
+			keys([], {a: 1}),
+			"empty selection of non-empty object",
+		);
+
+		t.assertEq(
+			{},
+			keys(["a"], {}),
+			"non-empty selection of empty object",
+		);
+
+		t.assertEq(
+			{ a: undefined, b: null },
+			keys(["a", "b", "c"], { a: undefined, b: null }),
+			"falsy values",
+		);
+	});
+};
+
+export const tests = [
+	test_eq,
+	test_keys,
+];
diff --git a/tests/lib.sh b/tests/lib.sh
new file mode 100644
index 0000000..9d183f9
--- /dev/null
+++ b/tests/lib.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+
+assert_arg() {
+	if [ -z "$1" ]; then
+		printf 'Missing %s.\n\n' "$2" >&2
+		cat <<-'EOF'
+			usage >&2
+			exit 2
+		EOF
+	fi
+}
+
+uuid() {
+        od -xN20 /dev/urandom |
+                head -n1 |
+                awk '{OFS="-"; print $2$3,$4,$5,$6,$7$8$9}'
+}
+
+tmpname() {
+        echo "${TMPDIR:-/tmp}/uuid-tmpname with spaces.$(uuid)"
+}
+
+mkstemp() {
+	name="$(tmpname)"
+	touch "$name"
+	echo "$name"
+}
+
+mkdtemp() {
+        name="$(tmpname)"
+	mkdir "$name"
+        echo "$name"
+}
diff --git a/tests/runner.js b/tests/runner.js
new file mode 100644
index 0000000..2e4e2ce
--- /dev/null
+++ b/tests/runner.js
@@ -0,0 +1,56 @@
+import { getExit, ARGV } from "../src/compat.js";
+import { eq } from "../src/utils.js";
+
+class AssertionError extends Error {}
+
+const red    = s => `\x1b[31m${s}\x1b[0m`;
+const green  = s => `\x1b[32m${s}\x1b[0m`;
+const yellow = s => `\x1b[33m${s}\x1b[0m`;
+
+const t = {
+	tap: x => {
+		console.error("tap:", x);
+		return x;
+	},
+	start: msg => {
+		console.error(`${msg}:`);
+	},
+	test: (msg, fn) => {
+		try {
+			fn();
+			console.error(`${yellow("testing")}: ${msg}... ${green("OK")}`);
+		} catch (e) {
+			console.error(`${yellow("testing")}: ${msg}... ${red("FAIL")}`);
+			throw e;
+		}
+	},
+	assertEq: (expected, given, msg = "") => {
+		if (!eq(expected, given)) {
+			console.error("expected:", expected, "\ngiven:   ", given);
+			throw new AssertionError(`${red(msg)}`);
+		}
+	},
+	assert: (x, msg = "") => {
+		if (!x) {
+			throw new AssertionError(`${red(msg)}`);
+		}
+	},
+};
+
+const main = async () => {
+	const { tests } = await import(`../${ARGV[1]}`);
+	for (const testFn of tests) {
+		await testFn(t);
+	}
+};
+
+
+getExit().then(async exit => {
+	try {
+		await main();
+		exit(0);
+	} catch (e) {
+		console.error(e);
+		exit(1);
+	}
+});
diff --git a/tools/makehelp.sh b/tools/makehelp.sh
new file mode 100755
index 0000000..39a38ca
--- /dev/null
+++ b/tools/makehelp.sh
@@ -0,0 +1,149 @@
+#!/bin/sh
+set -eu
+
+. tests/lib.sh
+
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  makehelp.sh < MAKEFILE
+		  makehelp.sh -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+
+		Options:
+		  -h, --help    show this message
+
+
+		Generate a help message from the given Makefile.
+
+		Any target or variable commented with two "#" characters gets
+		picked up.  Multi-line comments are supported:
+
+		  VAR1 = 1
+		  # a comment
+		  VAR2 = 2
+		  ## another comment -> this one is included in the docs
+		  VAR3 = 3
+
+		  ## with a big
+		  ## comment, which is also included
+		  a-target:
+
+
+		Examples:
+
+		  Generate help messages from "Makefile":
+
+		    $ aux/makehelp.sh < Makefile
+
+
+		  Generate help messages for all targets:
+
+		    $ cat Makefile dev.mk | aux/makehelp.sh
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		(--)
+			break
+			;;
+		(--help)
+			usage
+			help
+			exit
+			;;
+		(*)
+			;;
+	esac
+done
+
+while getopts 'h' flag; do
+	case "$flag" in
+		(h)
+			usage
+			help
+			exit
+			;;
+		(*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+
+TARGETS="$(mkstemp)"
+VARIABLES="$(mkstemp)"
+trap 'rm -f "$TARGETS" "$VARIABLES"' EXIT
+
+awk -vCOLUMN=15 -vTARGETS="$TARGETS" -vVARIABLES="$VARIABLES" '
+function indent(n, where) {
+	for (INDENT = 0; INDENT < n; INDENT++) {
+		printf " " > where
+	}
+}
+
+/^## / { doc[len++] = substr($0, 4) }
+
+/^[-_a-zA-Z]+:/ && len {
+	printf "\033[36m%s\033[0m", substr($1, 1, length($1) - 1) > TARGETS
+	for (i = 0; i < len; i++) {
+		n = COLUMN - (i == 0 ? length($1) - 1 : 0)
+		indent(n, TARGETS)
+		printf "%s\n", doc[i] > TARGETS
+	}
+	len = 0
+}
+
+/^.++=/ && len {
+	printf "\033[36m%s\033[0m", $1 > VARIABLES
+	for (i = 0; i < len; i++) {
+		n = COLUMN - (i == 0 ? length($1) : 0)
+		indent(n, VARIABLES)
+		printf "%s\n", doc[i] > VARIABLES
+	}
+	len = 0
+}'
+
+
+
+indent() {
+	sed 's|^|  |'
+}
+
+cat <<-EOF
+	Usage:
+
+	  make [VARIABLE=value...] [target...]
+
+
+	Targets:
+
+	$(indent < "$TARGETS")
+
+
+	Variables:
+
+	$(indent < "$VARIABLES")
+
+
+	Examples:
+
+	  Build "all", the default target:
+
+	    $ make
+
+
+	  Test and install, with \$(DESTDIR) set to "tmp/":
+
+	    $ make DESTDIR=tmp check install
+EOF
diff --git a/tools/manpages.sh b/tools/manpages.sh
new file mode 100755
index 0000000..959b1c2
--- /dev/null
+++ b/tools/manpages.sh
@@ -0,0 +1,126 @@
+#!/bin/sh
+set -eu
+
+. tests/lib.sh
+
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  sh doc/manpages.sh -i|-u -p MANDIR FILE...
+		  sh doc/manpages.sh -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+
+		Options:
+		  -i            set ACTION=install
+		  -u            set ACTION=uninstall
+		  -p MANDIR     use $MANDIR as the prefix directory
+		  -h, --help    show this message
+
+
+		Installs/uninstalls manpage files into MANDIR using the original
+		filename as a hint towards which subdirectory to pick: the
+		`prog.ru.1` file is installed under the `man1/` directory
+		hierarchy under the `ru/` language folder.  When then language
+		is `en`, a the toplevel `man1/` gets a symlink to the `en/`
+		language folder:
+
+		  man/
+		    en/
+		      man1/
+		        prog.1
+		    ru/
+		      man1/
+		        prog.1
+		    man1/
+		      prog.1 -> ../en/man1/prog.1
+
+
+		Examples:
+
+		  Install prog.en.1 under `/usr/man`:
+
+		    $ sh doc/manpages.sh -ip/usr/man prog.en.1
+
+
+		  Uninstall all files listed under doc/ from `$PREFIX`:
+
+		    sh doc/manpages.sh -up "$PREFIX" doc/*.[0-9]
+	EOF
+}
+
+
+for flag in "$@"; do
+	case "$flag" in
+		(--)
+			break
+			;;
+		(--help)
+			usage
+			help
+			exit
+			;;
+		(*)
+			;;
+	esac
+done
+
+while getopts 'iup:h' flag; do
+	case "$flag" in
+		(i)
+			ACTION=install
+			;;
+		(u)
+			ACTION=uninstall
+			;;
+		(p)
+			MANDIR="$OPTARG"
+			;;
+		(h)
+			usage
+			help
+			exit
+			;;
+		(*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+eval "$(assert_arg "${ACTION:-}" '-[iu] for choosing action')"
+eval "$(assert_arg "${MANDIR:-}" '-p MANDIR')"
+eval "$(assert_arg "${1:-}"      'FILE...')"
+
+
+for f in "$@"; do
+	l="$(echo "$f" | awk -F. '{print $(NF-1)}')"
+	n="$(echo "$f" | awk -F. '{print $NF}')"
+	case "$ACTION" in
+		(install)
+			to_name="$(basename "${f%."$l"."$n"}.$n")"
+			mkdir -p "$MANDIR/$l/man$n" "$MANDIR/man$n"
+			cp "$f" "$MANDIR/$l/man$n/$to_name"
+			if [ "$l" = 'en' ]; then
+				ln -fs "../en/man$n/$to_name" \
+					"$MANDIR/man$n/$to_name"
+			fi
+			;;
+		(uninstall)
+			to_name="$(basename "${f%."$l"."$n"}.$n")"
+			rm -f \
+				"$MANDIR/$l/man$n/$to_name" \
+				"$MANDIR/man$n/$to_name"
+			;;
+		(*)
+			echo "Bad ACTION: $ACTION"
+			exit 1
+			;;
+	esac
+done