aridity

The Arid Manifesto

Paths as keys to avoid key concatenation
It's never necessary to repeat a value
Minimal syntax for surprise-free authoring
Lazy context-sensitive evaluation
Strongly (dynamically) typed values
Central defaulting rather than at call sites
Templating using same syntax as expressions
Easy to correctly quote/escape values in templates
Extensibility via user-defined functions
Easy tasks are easy, hard tasks are possible
Many applications can share one user config
Principle of least astonishment driven design

Config file syntax

: Until aridity gets support for comments, you can use the colon directive to ignore data.
: Directives MUST be separated from data by whitespace, and are typically punctuation.

: Here's the equals directive:
foo = bar
: This does what you'd expect - assign the string value bar to foo.
: foo is actually a path of length 1, path components are whitespace-separated:
this is a path = this is a value

: Internal whitespace in values is preserved (leading and trailing whitespace is not):
two sentences = Some like 2 spaces.  After a full stop.

: You can use indentation to avoid typing a common path prefix multiple times:
app1 feature1
    data1 = value1
    data2 = value2
app2
    feature1 data = value3
    feature2
        data1 = value4
        data2 = value5
: Exactly the same effect without using indentation:
app1 feature1 data1 = value1
app1 feature1 data2 = value2
app2 feature1 data = value3
app2 feature2 data1 = value4
app2 feature2 data2 = value5

: The right hand side of an equals is actually an expression.
: In an expression, a dollar sign with brackets can be used to refer to another path:
has value
    bar = $(foo)
    value3 = $(app2 feature1 data)
: Round brackets and square brackets have exactly the same effect:
also has value bar = $[foo]
: Values can be concatenated:
two bars
    without spacing = $(foo)$(foo)
    with one space  = $(foo) $(foo)
    with 2 spaces   = $(foo)  $(foo)

: To get a literal dollar there is a special form for quoting:
financial report = $'(We lost $100 on Friday.)
: Be careful with nested brackets, the first matching bracket ends the special form:
behaviour
    expected   = $'[Lunch cost $20 (worth it though).]
    unexpected = $'(Lunch cost $20 (worth it though).)

: Another special form can be used to preserve leading/trailing whitespace:
padded bars = $.( $(foo) $(foo) )
: Brackets can span multiple lines:
bar per line
    without final newline = $.($(foo)
$(foo))
    with final newline = $.($(foo)
$(foo)
)

: Evaluation is lazy, the expression is what is actually assigned to the path:
no problem = $(this path will get a value later)
: If your use-case demands it, you can force eager evaluation:
bar even if foo changes later := $(foo)

: When evaluating a path the local context is examined first, then its parents if path not found:
host
    short path = nope
    guest short path = yep
    should be nope = $(short path)
    guest should be yep = $(short path)
does not work = $(short path)

Metadata

Release files for aridity 14

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for aridity 14
File	Size	Uploaded
aridity-14.tar.gz	15.8 kB	Feb 24, 2020	Details

Built distribution (wheel)

Table of built distributions (wheels) for aridity 14
File	Interpreter	ABI	Platform	Reset
aridity-14-py2.py3-none-any.whl 58.9 kB Feb 24, 2020	Python 3, Python 2	none	any	Details

Total release size: 74.7 kB

Release files / aridity-14.tar.gz

Download URL	aridity-14.tar.gz
Size	15.8 kB
Tags	Source
SHA-256 checksum How to use checksums	`ded6fe1cfae5a7a2ec576b7139ab0ca53bffa38b282db7cdafa4c08d1f983ec0`
BLAKE2b-256 checksum How to use checksums	`035879a315a4483bea680a2927c1010e99a13c824edb8ece04af82fe597d49b9`
Upload date	Feb 24, 2020
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/3.1.1 pkginfo/1.5.0.1 requests/2.22.0 setuptools/45.2.0 requests-toolbelt/0.9.1 tqdm/4.42.1 CPython/3.7.3`

Release files / aridity-14-py2.py3-none-any.whl

Download URL	aridity-14-py2.py3-none-any.whl
Size	58.9 kB
Tags	Python 2 Python 3
SHA-256 checksum How to use checksums	`7237478208036c43b098421a35f2abb3185b53b52ca2676e9f95a3c93fd4708b`
BLAKE2b-256 checksum How to use checksums	`9ddc17828a197dc1e52dbfa606207dece6f069db67c9ca133d2ea1df861d004f`
Upload date	Feb 24, 2020
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/3.1.1 pkginfo/1.5.0.1 requests/2.22.0 setuptools/45.2.0 requests-toolbelt/0.9.1 tqdm/4.42.1 CPython/3.7.3`