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-[Literate Programming](https://en.wikipedia.org/wiki/Literate_programming)
-tool to convert Mu's layers into compilable form.
-
-Mu's tangling directives differ from Knuth's classic implementation. The
-classical approach starts out with labeled subsystems that are initially
-empty, and adds code to them using two major directives:
-
-```
-<name> ≡
-<code>
-```
-
-```
-<name> +≡
-<code>
-```
-
-_(`<code>` can span multiple lines.)_
-
-This approach is best suited for top-down exposition.
-
-On the other hand, Mu's tangling directives are better suited for a cleaned-up
-history of a codebase. Subsystems start out with a simple skeleton of the core
-of the program. Later versions then tell a story of the evolution of the
-program, with each version colocating all the code related to new features.
-
-Read more:
-* http://akkartik.name/post/wart-layers
-* http://akkartik.name/post/literate-programming
-* https://github.com/akkartik/mu/blob/master/000organization.cc
-
-## directives
-
-Add code to a project:
-
-```
-:(code)
-<code>
-```
-
-Insert code before a specific line:
-
-```
-:(before <waypoint>)
-<code>
-```
-
-Here `<waypoint>` is a substring matching a single line in the codebase. (We
-never use regular expressions.) Surround the substring in `"` quotes if it
-spans multiple words.
-
-Insert code _after_ a specific line:
-
-```
-:(after <waypoint>)
-<code>
-```
-
-Delete a specific previously-added line (because it's not needed in a newer
-version).
-
-```
-:(delete <line>)
-```
-
-Delete a block of code starting with a given header and surrounded by `{` and
-`}`:
-
-```
-:(delete{} <header>)
-```
-
-_(Caveat: doesn't directly support C's `do`..`while` loops.)_
-
-Replace a specific line with new code:
-
-```
-:(replace <line>)
-<code>
-```
-
-This is identical to:
-```
-:(before <line>)
-<code>
-:(delete <line>)
-```
-_(Assuming `<code>` did not insert a new line matching the substring `<line>`.)_
-
-Replace a block of code with another:
-
-```
-:(replace{} <header>)
-<code>
-```
-
-Insert code before or after a substring pattern that isn't quite a unique
-waypoint in the whole codebase:
-
-```
-:(before <line> following <waypoint>)
-<code>
-:(after <line> following <waypoint>)
-<code>
-```
-
-```
-:(before <waypoint> then <line>)
-<code>
-:(after <waypoint> then <line>)
-<code>
-```