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Ant task to run an Ant target only if a file exists?
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This might make a little more sense from a coding perspective (available with ant-contrib: http://ant-contrib.sourceforge.net/):
<target name="someTarget">
<if>
<available file="abc.txt"/>
<then>
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comparing sbt and Gradle [closed]
... interested in using Gradle instead of Ivy for SBT.
(both tools can learn from each other)
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Multiple columns index when using the declarative ORM extension of sqlalchemy
... SQSAlchemy, trying to figure out a how to substitute mytable.c.somecol.
from sqlalchemy import Index
Index('someindex', mytable.c.somecol.desc())
We can just use the model property and call .desc() on it:
from flask_sqlalchemy import SQLAlchemy
db = SQLAlchemy()
class GpsReport(db.Model):
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Add an element to an array in Swift
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anArray+="Foo" does not work anymore from xCode 6 beta 5
– Amitay
Aug 7 '14 at 6:44
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What's the difference between xsd:include and xsd:import?
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Use xsd:include to bring in an XSD from the same or no namespace.
Use xsd:import to bring in an XSD from a different namespace.
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Why is January month 0 in Java Calendar?
...ell be due to old C APIs, or just a general feeling of starting everything from 0... except that days start with 1, of course. I doubt whether anyone outside the original implementation team could really state reasons - but again, I'd urge readers not to worry so much about why bad decisions were ta...
How does deriving work in Haskell?
...y become instances of some typeclasse s (like Show , Eq ) by deriving from them.
3 Answers
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How do I forward parameters to other command in bash script?
... only 2 : ${@:2:1}"
echo "params 2 and 3 : ${@:2:2}"
echo "params all from 2: ${@:2:99}"
echo "params all from 2: ${@:2}"
run it:
$ chmod u+x r.sh
$ ./r.sh 1 2 3 4 5 6 7 8 9 10
the result is:
params only 2 : 2
params 2 and 3 : 2 3
params all from 2: 2 3 4 5 6 7 8 9 10
params all from 2...
What are paramorphisms?
...ameters get both the original subobject and the value computed recursively from it.
An example function that's nicely expressed with para is the collection of the proper suffices of a list.
suff :: [x] -> [[x]]
suff = para (\ x xs suffxs -> xs : suffxs) []
so that
suff "suffix" = ["uffix"...
Fast way to get image dimensions (not filesize)
...ions also PPM, WEBP), and does only read the header.
The identify command (from ImageMagick) prints lots of image information for a wide variety of images. It seems to restrain itself to reading the header portion (see comments). It also has a unified output which file sadly lacks.
exiv2 gives you d...