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cactuscon-2019

Slides

The slides are in this repository.

Running the examples

  • Install comby
  • The match with-highlights utility is work in progress and not available yet :) You can run all the examples and get plain text output with the commands below
  • In general, run the commands at the root directory of the directory or repository that you want to search
  • Tack on -stats to get a summary of matches and number of files searched
  • See more command line options with -h and usage at comby.dev

Example libssh2

  • git clone libssh2-f1cfa55, which is libssh2 pinned to the commit that contains matches for the example pattern
  • cd libssh2-f1cfa55
  • Then run:
comby 'alloc_workqueue(:[args]);' '' .c -match-only -stats

Example Linux Kernel

  • git clone the linux kernel, or any repository you want to search over
  • cd into the root directory, then run these commands

Part 1

comby 'alloc_workqueue(:[args]); :[[word]]' '' -rule 'where :[[word]] != "if"' .c -match-only

Part 2

comby 'alloc_workqueue(:[args]); :[[word]]' '' -rule 'where :[[word]] != "if", :[[word]] != "BUG_ON"' .c -match-only

Example Kubernetes

  • git clone https://github.com/kubernetes/kubernetes
  • cd kubernetes
comby ':[[v]], err := strconv.ParseInt(:[1], :[2], 64) :[rest]' '' -rule 'where match :[rest] { | "int32(:[arg])" -> :[arg] == :[[v]] }' .c -match-only