94 lines
3.6 KiB
Markdown
94 lines
3.6 KiB
Markdown
# Introduction
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This package is a collection of flags for geographic region and sub-region codes.
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The regions are based on the data from [BCP 47][0] and selected sub-regions (US
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states, Canadian provinces and territories, and some sub-regions of Great Britain)
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are based on [ISO 3166-2:US][1], [ISO 3166-2:CA][2], and [ISO-3166-2:GB][2].
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Most people think of these regions from BCP 47 as country flags, but there are a
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few codes / flags that do not correspond to countries. The flags are in SVG and
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PNG format and named by their BCP 47 region code, which for countries is the same
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as ISO 3166-2 country code. In case of sub-regions, ISO 3166-2 is used for naming
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the files; e.g. `US-DE.png` is the flag of the State of Delaware.
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The canonical way to get all BCP 47 region codes is to look for records in
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`language-subtag-registry` (which is downloaded from [IANA Language Subtag
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Registry][0]) with the following fields:
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Type: region
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Subtag: [A-Z]{2}
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AND NOT Description: Private use
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AND NOT Deprecated: .*
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Regions not in that repository can be added to `language-subtag-private`.
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One such region has been added.
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Some regions do not have their own flag. In such cases, they are symlinked to
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the best flag to represent them, which in most cases is the flag of their
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regional or political parent. These are listed in file `ALIASES`.
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The sub-regions currently covered are:
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- US states and the District of Columbia
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- Canadian provinces and territories
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- Countries of England, Scotland, and Wales in Great Britain
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- The province Northern Ireland in Great Britain
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The flags are downloaded from Wikipedia. When Wikipedia flags were copyrighted,
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we worked we Wikipedia editors to either relicense them, or drew / sourced and
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uploaded new public-domain versions. In particular, the license for these
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flags were resolved for the initial import:
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- Montenegro
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- Nicaragua
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- Sint Maarten
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- Ascension Island
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- Lesotho
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- Kosovo
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# Scripts
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- The script `regions.py` lists all regions and some selected sub-regions with their metadata.
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- The script `regions-wp.py` shows the Wikipedia URL for the flag page.
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- The script `missing.sh` shows all such regions that we don't have flags for.
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- The script `make-aliases.sh` makes symlinks for regions that use flag of another
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region.
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- The script `download-wp.py` downloads missing flags from Wikipedia and generating
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optimized SVG and PNG versions.
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You can use the [waveflag script from the Noto fonts project](../../waveflag.c)
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to _wave_ PNG flags.
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# Requirements
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- Python 3
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- [`dos2unix`](http://sourceforge.net/projects/dos2unix/)
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- `rsvg-convert` part of [`librsvg`](https://wiki.gnome.org/Projects/LibRsvg)
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- [`optipng`](http://optipng.sourceforge.net/)
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# Updating
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If new regions are needed, update `language-subtag-registry` from [IANA Language
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Subtag Registry][0], or add new regions to `language-subtag-private` before. Then
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update `data/ALIASES` and `data/ALIASES-WP` as needed.
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If a specific flag on Wikipedia flag is under Creative Commons, work with Wikipedia
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editors to relicense it to public domain. If the flag is not explicitly marked
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`public_domain` but otherwise exempt from Copyright (typically, because of
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national laws), make a note of it in file `COPYING`.
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To download missing flags, run `download-wp.py`.
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To update to latest flags from Wikipedia, delete the `html`, `svg`, and `png`
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directories, then run `make-aliases.sh` followed by `download-wp.py`.
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# License
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See file `COPYING` for details.
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[0]: http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry
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[1]: https://www.iso.org/obp/ui/#iso:code:3166:US
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[2]: https://www.iso.org/obp/ui/#iso:code:3166:GB
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[3]: https://www.iso.org/obp/ui/#iso:code:3166:CA
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