I/O facility for Idefix/Pluto configuration files
Project description
inifix
inifix is a small Python library of I/O functions to read and write 'ini'
configuration files in the style of Pluto and
Idefix.
While its primary goal is to follow Idefix's 'ini' format specification, it supports a small superset of it.
The key differences are:
inifixsupports section-free definitions. This means confifuration files from FARGO 3D are also supported.- in
inifix, strings can be escaped using'or". This allows to have whitespaces in string values and to force string type decoding where numeric and boolean types would work.
In rare cases where Idefix's 'ini' format doesn't match Pluto's, inifix will
follow the former. Known differences are:
- Idefix allows booleans to be written as
yesandno. - Idefix allows integers to be written using scientific notation (e.g.
1e3)
File format specifications details
Unroll !
- parameter names are strings - names and values are separated by non-newline white spaces - values are represented in unicode characters - all values are considered numbers if possible (e.g., `1e3` is read as `1000`) - number values are read as integers if no loss of precision ensues, and floats otherwise - `true` and `false` (resp. `yes` and `no`) are cast to booleans (case-insensitive) - values that can't be read as number or booleans are read as strings. - string delimiters `"` and `'` can be used for strings containing whitespace, or to force string type for values that would otherwise be read as numbers and booleans. - a parameter can be associated to a single value or a list of whitespace-separated values - sections titles start with `[` and end with `]` - comments start with `#` and are ignoredA file is considered valid if calling inifix.load(<filename>) doesn't raise an
error.
Examples
The following content is considered valid
# My awesome experiment
[Grid]
x 1 2 u 10 # a comment
y 4 5 l 100
[Time Integrator]
CFL 1e-3
tstop 1E3
and maps to
{
"Grid": {
"x": [1, 2, "u", 10],
"y": [4, 5, "l", 100]
},
"Time Integrator": {
"CFL": 0.001,
"tstop": 1000.0
}
}
The following section-less format doesn't comply to Pluto/Idefix's specifications, but it is considered valid for inifix. This is the one intentional differences in specifications, which makes inifix format a superset of Pluto's inifile format.
mode fargo
# Time integrator
CFL 1e-3
tstop 1e3
and maps to
{
"mode": "fargo",
"CFL": 0.001,
"tstop": 1000.0
}
Note that strings using e-notation (e.g. 1e-3 or 1E3 here) are decoded as
floats. Reversely, when writing files, floats are re-encoded using e-notation
if it leads to a more compact representation. For instance, 100000.0 is encoded
as 1e5, but 189.0 is left unchanged because 1.89e2 takes one more character.
In cases where both reprensations are equally compact (e.g. 1.0 VS 1e0),
decimal is prefered in encoding.
While decoding, e can be lower or upper case, but they are always encoded as
lower case.
Installation
python -m pip install inifix
Usage
The public API mimicks that of Python's standard library json,
and consists in four main functions:
inifix.loadandinifix.dumpread from and write to files respectivelyinifix.loadsreads from astrand returns adict, whileinifix.dumpsdoes the reverse operation.
Reading data
inifix.load reads from a file and returns a dict
import inifix
with open("pluto.ini", "rb") as fh:
conf = inifix.load(fh)
# or equivalently
conf = inifix.load("pluto.ini")
Files are assumed to be encoded as UTF-8.
inifix.load and inifix.loads accept a optional boolean flag
parse_scalars_as_list (new in inifix v4.0.0), that is useful to simplify
handling unknown data: all values can be safely treated as arrays, and iterated
over, even in the presence of scalar strings. For illustration
>>> import inifix
>>> from pprint import pprint
>>> pprint(inifix.load("example.ini"))
{'Grid': {'x': [1, 2, 'u', 10], 'y': [4, 5, 'l', 100]},
'Time Integrator': {'CFL': 0.001, 'tstop': 1000.0}}
>>> pprint(inifix.load("ex.ini", parse_scalars_as_lists=True))
{'Grid': {'x': [1, 2, 'u', 10], 'y': [4, 5, 'l', 100]},
'Time Integrator': {'CFL': [0.001], 'tstop': [1000.0]}}
... and writing back to disk
inifix.dump allows to write back to a file.
This allows to change a value on the fly and create new configuration files programmatically, for instance.
conf["Time"]["CFL"] = 0.1
with open("pluto-mod.ini", "wb") as fh:
inifix.dump(conf, fh)
# or equivalently
inifix.dump(conf, "pluto-mod.ini")
Data will be validated against inifix's format specification at write time. Files are always encoded as UTF-8.
Schema Validation
inifix.validate_inifile_schema can be used to validate an arbitrary
dictionary as writable to an inifile, following Pluto/Idefix's format. This
will raise an exception (ValueError) if the dictionnary data is invalid.
inifix.validate_inifile_schema(data)
CLI
Command line tools are shipped with the package to validate or format compatible inifiles.
Validation
This checks that your inifiles can be loaded with inifix.load from the command line
$ inifix-validate pluto.ini
Validated pluto.ini
This simple validator can be used as a hook for pre-commit. Simply add the
following to your project's .pre-commit-config.yaml
- repo: https://github.com/neutrinoceros/inifix.git
rev: v4.0.0
hooks:
- id: inifix-validate
Formatting
To format a file in place, use
$ inifix-format pluto.ini
inifix-format is guaranteed to preserve comments and to only edit (add or remove) whitespace characters.
Files are always encoded as UTF-8.
Options
- To print a diff patch to stdout instead of editing the file, use the
--diffflag
$ inifix-format pluto.ini --diff
This program also doubles as pre-commit hook
- repo: https://github.com/neutrinoceros/inifix.git
rev: v4.0.0
hooks:
- id: inifix-format
Testing
We use the pytest framework to test
inifix. The test suite can be run from the top level with a simple pytest
invocation.
$ python -m pip install --requirement requirements/tests.txt
$ pytest
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