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+Copyright (C) Case Duckworth
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ok : a minimal build system in posix sh
+
+ok is a minimal build system that's kinda like make in that you plop a file
+describing your build in your project's folder, then run a system command that
+reads the file and builds the project.  it's written in posix sh and is designed
+to be strictly more expressive than posix make, which is awful.
+
+[[ INSTALLING ]]
+
+ok is just a shell script, so you can mv or cp it to your $PATH.  It requires a
+somewhat-modern posix-compliant shell (i am not going to figure out what
+"somewhat-modern" means), as well as the following utilities:
+
+- sed
+- grep
+- cut
+
+if you don't have these, congratulations!  You are really doing something
+interesting with your system.
+
+[[ USING OK ]]
+
+If the project you're hacking on has an okfile (by default, ./ok), you can just
+run ok and it'll do whatever the author made the default target.  You can also
+run ok with the following flags:
+
+- -h      shows a help message, then exits
+- -q      runs ok in "quiet" mode; that is, no messages are printed
+- -x      runs ok with "set -x" turned on; this is a shell feature
+          that might help you debug some weirdness
+- -n      runs ok in "dry-run" mode; that is, no recipes are run
+- -B      run all targets as if they were "new," like make -B
+- -f FILE use FILE as the okfile instead of ./ok
+- -C DIR  change to DIR before doing anything, like make -C
+
+ok -h will also print the targets it's found in the okfile, along with
+explanatory comments provided on the target's first lines.  See the example
+provided below for an idea.
+
+[[ WRITING OKFILES ]]
+
+of course, the real part of using ok is writing the okfile.  This section
+describes the format of that file, which is a shell script sourced by ok, to
+help you write good okfiles for your own projects.
+
+an okfile is simply a shell script where every function defined is a target.
+The first function in the script is the default target that runs if no target is
+specified.  ok has a few utility functions to make writing targets easier:
+
+- ok : print, then run the command given after it on the command line.  if -q
+       has been passed, suppress printing; if -n has been passed, suppress
+       running.  if the command fails, ok will exit with 100 + the command's
+       exit code.
+
+- dep : define a dependency on the targets specified as arguments.  the
+        dependencies will be run in the order of the command line before
+        continuing with the current recipe.
+
+- fr : define a series of file rules.  See the next section for a description of
+       these.
+
+- allfiles : print all the files defined in the fr call.
+
+[[ FILE RULES (FR) ]]
+
+while writing shell functions is fine and dandy to simulate make's .PHONY rules,
+it does nothing for the main use of make: generating files from other files.
+The solution i landed on for ok was the fr function, which is short for file
+rules.  This section describes the format of fr's input, as well as suggestions
+for use.
+
+fr reads lines from standard input, processes them, and outputs them to an
+frfile in the current directory (which can be safely deleted, and is in fact
+rebuilt on every invocation).  I recommend using a heredoc for building the file
+rules, since that allows free-form text as well as programmatic rule generation
+(something make does not do).
+
+each line fr reads will be parsed as a TARGET, a JOB, and the JOB's DEPS.  The
+TARGET is the target file to build, JOB is the job to run to build that file,
+and DEPS are all the dependencies of TARGET.
+
+DEPS can include both build and order dependencies.  Build dependencies are
+appended to JOB as arguments, while order dependencies merely force TARGET to be
+built if it's newer than them.  TODO: THERE IS A BUG IN THIS IMPLEMENTATION.
+ORDER DEPENDENCIES ARE CURRENTLY IGNORED.
+
+JOB should be a function defined in the okfile or a one-word command, since fr
+doesn't do any special $IFS magic.  I recommend creating an ok function that
+encapsulates JOB's logic and including that in the fr block.
+
+[[ FR EXAMPLE ]]
+
+since fr is possibly the most complex thing to understand for ok, here is an
+example.  This okfile is how i build a simple 'hello, world' program in C[1]:
+
+---------------------------------------------->8
+for c in *.c
+do echo "${c%.c}" build "$c"
+done | fr
+
+: "${CC:=cc}"
+
+default() { dep allfiles; }
+
+build() { # build an executable from a c source file
+        ok "$CC" "$1" -o "$TARGET"
+}
+8<----------------------------------------------
+
+as you can see, providing a heredoc to fr's input means i can build up the flies
+i want to build dynamically, rather than having to update the okfile every time.
+This fr invocation produces the following file[2]:
+
+---------------------------------------------->8
+hello   ok build        hello.c
+8<----------------------------------------------
+
+in this simple example, i could've written this just as well:
+
+---------------------------------------------->8
+fr<<..
+hello build hello.c
+..
+8<----------------------------------------------
+
+you can depend on all files that need building using the 'allfiles' target, so
+it's a good idea to put a 'dep allfiles' somewhere in your build functions.  you
+can see it above in the 'default' rule.
+
+[[ COPYING AND CONTRIBUTING ]]
+
+ok is distributed under a standard BSD 3-clause license.  Contributions are
+welcome; feel free to email me[3] with feedback, questions, or patches.
+
+[[ INSPIRATION ]]
+
+thanks to akkartik, whose basic-build[4] gave me the inspiration for ok.
+
+[1] https://www.helloworldin.com/c.html, e.g.
+[2] https://www.acdw.net/.fr
+[3] mailto:git@acdw.net
+[4] https://git.sr.ht/~akkartik/basic-build
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