i have a small peice of code which prints if platform is unix or windowsas
<if>
<equals=${arg1} value="linux-86"/>
<then>
<echo message="linux"
<then>
<elseif>
<equals=${arg1} value="linux-64"/>
<then>
<echo message="linux"/>
</then>
</elseif>
<else>
<echo message="Windows">
</else>
</if>
Here we can see we are unnecessarily checking first two conditions for same message,is there any OR operator in ant like we have in c ||,so that we can write arg1=linux-64||linux-86....if there is please tell me how should i use this will save up lot of time here
<condition property="WinPlatform.Check">
<or>
<equals arg1="${param1}" arg2="win-x86"/>
<equals arg1="${param1}" arg2="win-x86-client"/>
<equals arg1="${param1}" arg2="win-x64"/>
</or>
</condition>
<target name="Mytarget" if="WinPlatform.Check">
<echo message="executing windows family build:::${param1}"/>
</target>
now call Mytarget with your parameter,it will work
The if task is part of ant-contrib. It is not available in core Ant.
Various conditions are available in core Ant and can be used, for example, to make target execution conditional.
Before 1.8, if/unless conditions evaluate "is the property set?"
<target name="test" if="foo" unless="bar"/>
From 1.8, if/unless conditions can evaluate "is the property true/false":
<target name="test" if="${foo}" unless="${bar}"/>
Why don't you have a look in the ant manual? http://ant.apache.org/manual/Tasks/conditions.html
Or google for "ant if task".
Related
I'm new to Ant/Apache. When I tried to use <condition> tag in XML it's throwing an error. condition doesn't support the nested "then" element. Here is my code
<target name="determine-ae-build">
<condition property="ApplicationName">
<equals arg1="${ApplicationName}" arg2="new"/>
<then>
<echo>3.9 Robots Config Copied</echo>
</then>
<else>
<condition property="ApplicationName">
<equals arg1="${ApplicationName}" arg2="old"/>
<then>
<echo>3.8 Robots Config Copied</echo>
</then>
<else>
<echo>3.9 Robots Config Copied</echo>
</else>
</condition>
</else>
</condition>
</target>
I've tried with IF also but since my Ant version is not supporting to do this. Can someone help to resolve this issue. Thanks! in advance
The condition task simply sets a property; it doesn't contain nested build logic. The property that it sets can later be used to control which targets are executed.
While you can use antcontrib's extra if, then, and else tasks to accomplish something like what you showed in your example, I'd recommend sticking to the native Ant approach, which relies on target dependencies and uses separate targets to control build logic:
<project name="build" basedir="." default="build">
<target name="build" depends="copy-3.8,copy-3.9" />
<target name="copy-3.8" depends="determine-ae-build" if="copy.old">
<echo>3.8 Robots Config Copied</echo>
</target>
<target name="copy-3.9" depends="determine-ae-build" unless="copy.old">
<echo>3.9 Robots Config Copied</echo>
</target>
<target name="determine-ae-build">
<condition property="copy.old">
<equals arg1="${ApplicationName}" arg2="old"/>
</condition>
</target>
</project>
With the above script, you would run ant build (possibly with -DApplicationName=old). The build target depends on both copy targets, both of which depend on determine-ae-build. The determine-ae-build target will therefore run first. If ApplicationName is set to "old" (either from a properties file that has been loaded, or from being provided in command line with -DApplicationName=old) then the property copy.old will be set to true. Otherwise it will remain unset.
Then copy-3.8 and copy-3.9 will be called. If copy.old is is true, copy-3.8 will run. Otherwise, it will be skipped. copy-3.9 has no condition so it will run no matter what.
Lastly, the build target will execute because it was the original target called from the command line, but it contains no actual steps so the build will finish.
<target name="prepare-copy" description="copy file based on condition" depends="determine-ae-build, prepare-copy-old, prepare-copy-new, prepare-copy-default">
<sleep seconds="10"/> --To read the results
</target>
<target name="prepare-copy-old" description="copy file based on condition" if="copy.old">
<echo>Old File Copied </echo>
</target>
<target name="prepare-copy-new" description="copy file based on condition" if="copy.new">
<echo>New File Copied</echo>
</target>
<target name="prepare-copy-default" description="copy file based on false condition" if="copy.default">
<echo>Default File Coping</echo>
</target>
<target name="determine-ae-build">
<condition property="copy.old">
<equals arg1="${ApplicationName}" arg2="old"/>
</condition>
<condition property="copy.new">
<equals arg1="${ApplicationName}" arg2="new"/>
</condition>
<condition property="copy.default">
<not>
<or>
<equals arg1="${ApplicationName}" arg2="new"/>
<equals arg1="${ApplicationName}" arg2="old"/>
</or>
</not>
</condition>
</target>
Explanation: Calling way "ant -Dcopy.old = true prepare-copy". Here we are passing to copy old file hence, "Old File Copied" will copied. If you call it like "ant prepare-copy" it'll call "Default File Coping".
Kindly Accept my answer if it is answered your question.Thankyou!
How can I use Ant to verify that the current working directory is located (arbitrarily deeply nested) under a certain path? For example, I want to execute a target only if the current directory is part of /some/dir/, for example if Ant is executed in directory /some/dir/to/my/project/.
The best I could come up with is a String contains condition:
<if>
<contains string="${basedir}" substring="/some/dir/"/>
<then>
<echo>Execute!</echo>
</then>
<else>
<echo>Skip.</echo>
</else>
</if>
This works for my current purpose but I'm afraid it might break some time in the future... for example when a build is executed in path /not/some/dir/ which is also contains the specified directory string.
Are there any more robust solutions like a startsWith comparison or even better a file system based check...?
There is no specific startswith condition in native Ant, but there is a matches condition that takes regular expressions.
As a side note, ant-contrib is rarely necessary for most build scripts, and will often lead to unreliable code. I would strongly recommend avoiding it.
Here's a sample script to illustrate how you can use the matches condition with native Ant. The test target is, of course, just for demonstration.
<property name="pattern" value="^/some/dir" />
<target name="init">
<condition property="basedir.starts.with">
<matches pattern="${pattern}" string="${basedir}" />
</condition>
</target>
<target name="execute" depends="init" if="basedir.starts.with">
<echo message="Executing" />
</target>
<target name="test">
<condition property="dir1.starts.with">
<matches pattern="${pattern}" string="/some/dir/" />
</condition>
<condition property="dir2.starts.with">
<matches pattern="${pattern}" string="/some/dir/to/my/project/" />
</condition>
<condition property="dir3.starts.with">
<matches pattern="${pattern}" string="/not/some/dir/" />
</condition>
<echo message="${dir1.starts.with}" />
<echo message="${dir2.starts.with}" />
<echo message="${dir3.starts.with}" />
</target>
Currently I have this code in ant script:
<target name="-pre-compile" if="${log.disabled}">
<antcall target="remove-logs"/>
</target>
It's pretty self explanatory: if log.disable=true in properties file, then my remove-logs target will be called. Now I need to make minor changes to if/else. Pseudo-code:
<target name="-pre-compile">
if("${log.disabled}")
<antcall target="remove-logs"/>
else if("${log.disabled.level}" != "")
<antcall target="remove-logs-levels"/>
</target>
how can I write that in ant?
Also, note that all these if/them ant-contrib do not work for me:
<target name="test-xxx">
<echo level="info">testing</echo>
<if>
<equals arg1="${log.disabled}" arg2="true" />
<then>
<echo message="true" />
</then>
<else>
<echo message="false" />
</else>
</if>
</target>
get's me this output:
custom_rules.xml:73: if doesn't support the nested "equals" element.
PS. Once again, I ended up writing javascript instead of wasting time with ant itself. What a crappy make replacement...
Ant provide conditionals. Frankly using ant-contrib is easier. It provides an if task. See a more detailed answer in ant-contrib - if/then/else task
This is a small piece of code please give a look at it then follow the description....
<condition property="${param1}">
<or>
<istrue value="win-x86"/>
<istrue value= "win-x86-client"/>
<istrue value= "win-x64"/>
</or>
</condition>
<target name="Mytarget" if="${param1}">
<echo message="executing windows family build:::${param1}"/>
</target>
<target name="print.name" >
<antcall target="win-x86-build">
<param name="param1" value="${platform.id}"/>
</antcall>
</target>
I want that when ever platform.id contains any of the windows family name it should print the message EXECUTING WINDOWS FAMILY BUILD but the problem is that it is printing this message even when the family is unix.
I think either I am not checking the condition properly or else i am doing some other mistake.
Can someone help me out with this please?
Since ant 1.9.1 you can do this:
<project name="tryit" xmlns:if="ant:if" xmlns:unless="ant:unless">
<exec executable="java">
<arg line="-X" if:true="${showextendedparams}"/>
<arg line="-version" unless:true="${showextendedparams}"/>
</exec>
<condition property="onmac">
<os family="mac"/>
</condition>
<echo if:set="onmac">running on MacOS</echo>
<echo unless:set="onmac">not running on MacOS</echo>
</project>
Looks like you misunderstood the Condition Task:
property: The name of the property to set.
Try using the Conditionos:
Test whether the current operating system is of a given type.
Peter is trying to explain that you must explicitly specify the property name. Try the following to make your code work:
<project name="demo" default="Mytarget">
<condition property="windoze">
<or>
<equals arg1="${param1}" arg2="win-x86"/>
<equals arg1="${param1}" arg2="win-x86-client"/>
<equals arg1="${param1}" arg2="win-x64"/>
</or>
</condition>
<target name="Mytarget" if="windoze">
<echo message="executing windows family build:::${param1}"/>
</target>
</project>
A better solution would be to make use of operating system tests built into ANT's condition task.
<project name="demo" default="Mytarget">
<condition property="windoze">
<os family="windows"/>
</condition>
<target name="Mytarget" if="windoze">
<echo message="executing windows family build:::${os.name}-${os.arch}-${os.version}"/>
</target>
</project>
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Ant task to check if a file exists?
How can one check if a file exist in a directory, if not use another file in different location. I tried the follow but does not help me with what I want. Could someone help?
<condition property="somefile.available">
<or>
<available file="/home/doc/somefile"/>
<and>
<available file="/usr/local/somefile" />
</and>
</or>
</condition>
Use condition tests to establish if files are present. Then have a target for each true condition
<target name="go" depends="file-checks, do-something-with-first-file, do-something-with-second-file"/>
<target name="file-checks">
<available file="/home/doc/somefile" property="first.file.found"/>
<available file="/usr/local/somefile" property="second.file.found"/>
</target>
<target name="do-something-with-first-file" if="first.file.found">
???
</target>
<target name="do-something-with-second-file" if="second.file.found">
???
</target>
If you don't mind using ant-contrib you can take the procedural approach like this:
<if>
<available file="file1"/>
<then>
<property name="file.exists" value="true"/>
</then>
<else>
<if>
<available file="file2"/>
<then>
<copy file="file2" tofile="file1"/>
<property name="file.exists" value="true"/>
</then>
</if>
</else>
</if>
Otherwise you can probably use a target that is conditional on a property being set to indicate whether the file already exists in the preferred location, like Ant task to run an Ant target only if a file exists? but using unless instead of if.