Re: [gobo-eiffel-develop] geant: notion of local variables

[Jocelyn <ei...@dj...>]

 > So far we didn't use branches in Gobo. Personally I think that
 > the best way to experiment with your changes and to find out
 > whether they break something or not it to commit them in the 
 > trunk.

Ok, in this case, a big commit is about to come.
It includes 
    - internal changes to create TASK faster (no more huge if elseif 
elseif ...on string comparison)
    - <local  /> to declare a variable as local
       for instance:   <local name="foo" />  or even by providing a 
value right away <local name="foo" value="bar" />

    - <global /> to declare a variable as global (this is currently the 
default behavior)
       for instance:   <global name="foo" />  or even by providing a 
value right away <global name="foo" value="bar" />

    - <group /> to group set of tasks
        for instance:
          <target name="test" >
                <available resource="$file" variable="file_available" />
                <group if="$file_available=true">
                         <echo message="..." />
                         <copy file="$file" to_file="${file}.bak" />
                         <exec executable="echo > $file" />
                </group>
          </target>
       You can use the if="..", unless=".." and even dir=".."  attribute 
on <group />

       You can also have nested groups, and so on ...

          <target name="test" >
                <argument name="backup_dir" />
                <argument name="file" />
                <global variable="backup_enabled" /><!-- not necessary 
for now -->
                <local variable="file_available" />

                <available resource="$file" variable="file_available" />
                <group if="$file_available=true">
                         <group if="$backup_enabled=true" dir="$backup_dir">
                             <description>Backup file in $backup_dir 
folder.</description>
                             <echo message="backup $file" />
                             <copy file="$file" to_file="${file}.bak" />
                             <echo message="Copied $file to ${file}.bak" />
                         </group>
                         <exec executable="echo new content > $file" />
                </group>
                <!-- no need to unset `file_available' since it is a 
local -->
          </target>


And this will make geant' scripts cleaner (I hope)
I started the work, to have "locals" as default instead of "globals", 
but not yet complete.

Any feedback, comment, bug report will be welcome.
-- Jocelyn