If you haven't, check out org mode in emacs. It can also inline graphs easily. With ready to go bindings for Python, graphviz, gnuplot, and R. (C-c C-x C-v will show charts inline with default bindings.)

My favorite is grabbing logs with a shell block. Reshaping with elisp or Python, and then charting with gnuplot. All in one file with an iterative workflow.