Review Request 128926: More robust version check for Sage

[Filipe Saraiva]

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Ship it!




Please, push it to master branch.
Thank you for your work Rojas, I invite you to use Phabricator (more precisely, [Differential](https://phabricator.kde.org/differential/)) for your next contributions to Cantor.

- Filipe Saraiva


On Sept. 19, 2016, 8:30 p.m., Antonio Rojas wrote:
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> (Updated Sept. 19, 2016, 8:30 p.m.)
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> Review request for KDE Edu and Filipe Saraiva.
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> Repository: cantor
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> Description
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> Version check for Sage is once again broken with the latest version. Instead of relying on parsing the sage banner, which is likely to break with changes in Sage output format, use the dedicated 'sage -v' command.
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> Diffs
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>   src/backends/sage/sagesession.cpp bd2c3dc 
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> Diff: https://git.reviewboard.kde.org/r/128926/diff/
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> Testing
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> Correct version is detected again according to the console output. Note that the backend is still broken with latest Sage, but that's a separate issue.
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> Thanks,
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> Antonio Rojas
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