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129 lines
3.7 KiB
Markdown
129 lines
3.7 KiB
Markdown
<div class="short">
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`%ford`
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=======
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Our typed and marked computation engine.
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A variety of different services are provided by `%ford`, but they mostly
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involve compiling hook files, slapping/slammming code with marked data,
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and converting data between marks, including validating data to a mark.
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Throughout every computation, `%ford` keeps track of which resources are
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dependencies so that the client may be aware when one or more
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dependencies are updated.
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`%ford` neither accepts unix events nor produces effects. It exists
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entirely for the benefit of applications and other vanes, in particular
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`%gall`. `%eyre` exposes the functional publishing aspects of `%ford`
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while `%gall` uses `%ford` to control the execution of applications.
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`%clay` is intended to use `%ford` to managed marked data, but this is
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not yet reality.
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</div>
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------------------------------------------------------------------------
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<list></list>
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------------------------------------------------------------------------
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Cards
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=====
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`%ford` accepts just one card, `%exec`. This is misleading, however,
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since there are fourteen different `silk`s that may be used with it. In
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every case, the expected response to a `%exec` card is a `%made` gift
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with either an error or the produced result along with its set of
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dependencies.
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Silks may autocons, so that the product of a cell of silks is a cell of
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the product of the two silks.
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[`%bake`](#bake)
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================
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Tries to functionally produce the file at a given beam with the given
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mark and heel. It fails if there is no way to translate at this level.
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[`%boil`](#boil)
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================
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Functionally produces the file at a given beam with the given mark and
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heel. If there is no way to translate at this beam, we pop levels off
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the stack and attempt to bake there until we find a level we can bake.
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This should almost always be called instead of `%bake`.
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[`%call`](#call)
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================
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Slams the result of one silk against the result of another.
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[`%cast`](#cast)
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================
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Translates the given silk to the given mark, if possible. This is one of
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the critical and fundamental operations of ford.
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[`%diff`](#diff)
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================
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Diffs the two given silks (which must be of the same mark), producing a
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cage of the mark specified in `++mark` in `++grad` for the mark of the
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two silks.
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[`%done`](#done)
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================
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Produces exactly its input. This is rarely used on its own, but many
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silks are recursively defined in terms of other silks, so we often need
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a silk that simply produces its input. A monadic return, if you will.
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[`%dude`](#dude)
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================
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Computes the given silk with the given tank as part of the stack trace
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if there is an error.
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[`%dune`](#dune)
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================
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Produces an error if the cage is empty. Otherwise, it produces the value
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in the unit.
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[`%mute`](#mute)
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================
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Takes a silk and a list of changes to make to the silk. At each wing in
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the list we put the value of the associated silk.
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[`%pact`](#pact)
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================
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Applies the second silk as a patch to the first silk. The second silk
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must be of the mark specified in `++mark` in `++grad` for the mark of
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the first silk.
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[`%plan`](#plan)
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================
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Performs a structured assembly directly. This is not generally directly
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useful because several other silks perform supersets of this
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functionality. We don't usually have naked hoods outside ford.
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[`%reef`](#reef)
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================
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Produces a core containing the entirety of zuse and hoon, suitable for
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running arbitrary code against. The mark is `%noun`.
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[`%ride`](#ride)
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================
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Slaps a twig against a subject silk. The mark of the result is `%noun`.
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[`%vale`](#vale)
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================
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Validates untyped data from a ship against a given mark. This is an
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extremely useful function.
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