perkeep/doc/search-ui.txt

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The User Interface's "Search" box accepts a space-separated list of predicates of the
form "[-]operator:value[:value]". These predicates are combined using conjunction.
That is to say we only have 'and' and atom negation for now.
Negation of a predicate is achieved by prepending a minus sign: -is:landscape will match
with pictures of not landscape ratio.
For example
after:"2010-01-01" before:"2010-03-02T12:33:44" -loc:"Amsterdam"
will return all images having "modtime" between before and after and not in Amsterdam.
When you need to match a value containing a space, you need to using double quotes around
the value only. For example: tag:"Three word tagname" and not "tag:Three word tagname".
If your value contains double quotes you can use backslash escaping.
For example: attr:bar:"He said: \"Hi\""
Usable operators:
after: date format is RFC3339, but can be shortened as required.
before: i.e. 2011-01-01 is Jan 1 of year 2011 and "2011" means the same.
attr: match on attribute. Use attr:foo:bar to match nodes having their foo
attribute set to bar.
format: file's format (or MIME-type) such as jpg, pdf, tiff.
has:location image has a location (GPSLatitude and GPSLongitude can be
retrieved from the image's EXIF tags).
loc: uses the EXIF GPS fields to match images having a location near
the specified location. Locations are resolved using
maps.googleapis.com. For example: loc:"new york, new york"
is:image object is an image
is:landscape the image has a landscape aspect
is:pano the image's aspect ratio is over 2 - panorama picture.
is:portrait the image has a portrait aspect.
height: use height:min-max to match images having a height of at least min
and at most max. Use height:min- to specify only an underbound and
height:-max to specify only an upperbound.
Exact matches should use height:640-640
tag: match on a tag
width: use width:min-max to match images having a width of at least min
and at most max. Use width:min- to specify only an underbound and
width:-max to specify only an upperbound.
Exact matches should use width:480-480
childrenof: Find child permanodes of a parent permanode (or prefix
of a parent permanode): childrenof:sha1-527cf12