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211 lines
4.9 KiB
Markdown
211 lines
4.9 KiB
Markdown
# Linking definitions to metadata
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The `link` and `unlink` commands can be used to manage metadata linked to definitions. For example, you can link documentation to a definition:
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```unison
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use .builtin
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coolFunction x = x * 2
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coolFunction.doc = [: This is a cool function. :]
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```
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```ucm
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I found and typechecked these definitions in scratch.u. If you
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do an `add` or `update`, here's how your codebase would
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change:
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⍟ These new definitions are ok to `add`:
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coolFunction : Nat -> Nat
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coolFunction.doc : Doc
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```
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```ucm
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.> add
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⍟ I've added these definitions:
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coolFunction : Nat -> Nat
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coolFunction.doc : Doc
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.> link coolFunction.doc coolFunction
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Updates:
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1. coolFunction : Nat -> Nat
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+ 2. doc : Doc
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```
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You can use arbitrary Unison values and link them as metadata to definitions:
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```unison
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toCopyrightHolder author = match author with
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Author guid name -> CopyrightHolder guid name
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alice = Author (GUID Bytes.empty) "Alice Coder"
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coolFunction.license = License [toCopyrightHolder alice] [Year 2020] licenses.mit
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licenses.mit = LicenseType [:
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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:]
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```
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```ucm
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I found and typechecked these definitions in scratch.u. If you
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do an `add` or `update`, here's how your codebase would
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change:
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⍟ These new definitions are ok to `add`:
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alice : Author
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coolFunction.license : License
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licenses.mit : LicenseType
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toCopyrightHolder : Author -> CopyrightHolder
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```
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```ucm
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.> add
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⍟ I've added these definitions:
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alice : Author
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coolFunction.license : License
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licenses.mit : LicenseType
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toCopyrightHolder : Author -> CopyrightHolder
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.> link coolFunction.license coolFunction
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Updates:
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1. coolFunction : Nat -> Nat
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+ 2. license : License
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.> link alice coolFunction
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Updates:
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1. coolFunction : Nat -> Nat
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+ 2. alice : Author
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```
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We can look at the links we have:
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```ucm
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.> links coolFunction
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1. alice : Author
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2. coolFunction.license : License
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3. coolFunction.doc : Doc
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Tip: Try using `display 1` to display the first result or
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`view 1` to view its source.
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.> links coolFunction License
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1. coolFunction.license : License
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Tip: Try using `display 1` to display the first result or
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`view 1` to view its source.
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```
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We can link the same metadata simultaneously to multiple definitions:
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```unison
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myLibrary.f x = x + 1
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myLibrary.g x = x + 2
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myLibrary.h x = x + 3
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```
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```ucm
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I found and typechecked these definitions in scratch.u. If you
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do an `add` or `update`, here's how your codebase would
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change:
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⍟ These new definitions are ok to `add`:
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myLibrary.f : Nat -> Nat
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myLibrary.g : Nat -> Nat
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myLibrary.h : Nat -> Nat
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```
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```ucm
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.> add
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⍟ I've added these definitions:
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myLibrary.f : Nat -> Nat
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myLibrary.g : Nat -> Nat
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myLibrary.h : Nat -> Nat
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.> cd myLibrary
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.myLibrary> find
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1. f : Nat -> Nat
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2. g : Nat -> Nat
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3. h : Nat -> Nat
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.myLibrary> link .alice 1-3
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Updates:
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1. myLibrary.f : Nat -> Nat
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+ 2. alice : Author
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3. myLibrary.g : Nat -> Nat
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+ 4. alice : Author
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5. myLibrary.h : Nat -> Nat
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+ 6. alice : Author
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.myLibrary> links f
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1. .alice : Author
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Tip: Try using `display 1` to display the first result or
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`view 1` to view its source.
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.myLibrary> links g
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1. .alice : Author
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Tip: Try using `display 1` to display the first result or
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`view 1` to view its source.
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.myLibrary> links h
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1. .alice : Author
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Tip: Try using `display 1` to display the first result or
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`view 1` to view its source.
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.myLibrary> history
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Note: The most recent namespace hash is immediately below this
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message.
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⊙ 1. #fa706ukb83
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□ 2. #ikha0ltbmc (start of history)
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.> unlink coolFunction.doc coolFunction
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Updates:
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1. coolFunction : Nat -> Nat
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- 2. doc : Doc
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```
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