Check the availability of Weblogo in PBstat.py

[HubLot]

For now, when launching PBstat.py whereas Weblogo software is not present, the script is launched anyway and just an error is printed, which could be easily missed. Plus, in the README of tool, it states that Weblogo is optionnal. From the run_demo2.sh script:

> ../PBstat.py -f psi_md_traj_all.PB.count -o psi_md_traj --map --neq --logo
Index of first residue is: 1
wrote psi_md_traj.PB.map.png

wrote psi_md_traj.PB.Neq
wrote psi_md_traj.PB.Neq.png

ERROR: /bin/sh: weblogo : command not found

ERROR: exit code != 0
exit code: 127

One solution could be to add a callback to the parsing of --logo option to test if Weblogo is present. Since the README states weblogo is optional, I don't know which solution is better when weblogo is not present and the option --logo is set:

• prevent the script to run
• run the script but do not perform the logo part.

[alexdb27]

excellent idea.

[jbarnoud]

Fixed by @HubLot with PR #61.