Jujutsu equivalents, if anyone is curious:

What Changes the Most

    jj log --no-graph -r 'ancestors(trunk()) & committer_date(after:"1 year ago")' \
      -T 'self.diff().files().map(|f| f.path() ++ "\n").join("")' \
      | sort | uniq -c | sort -nr | head -20

    jj log --no-graph -r 'ancestors(trunk()) & ~merges()' \
      -T 'self.author().name() ++ "\n"' \
      | sort | uniq -c | sort -nr

    jj log --no-graph -r 'ancestors(trunk()) & description(regex:"(?i)fix|bug|broken")' \
      -T 'self.diff().files().map(|f| f.path() ++ "\n").join("")' \
      | sort | uniq -c | sort -nr | head -20

    jj log --no-graph -r 'ancestors(trunk())' \
      -T 'self.committer().timestamp().format("%Y-%m") ++ "\n"' \
      | sort | uniq -c

    jj log --no-graph \
      -r 'ancestors(trunk()) & committer_date(after:"1 year ago") & description(regex:"(?i)revert|hotfix|emergency|rollback")'

I love how the author thinks developers write commit messages.

All joking aside, it really is a chronic problem in the corporate world. Most codebases I encounter just have "changed stuff" or "hope this works now".

It's a small minority of developers (myself included) who consider the git commit log to be important enough to spend time writing something meaningful.

AI generated commit messages helps this a lot, if developers would actually use it (I hope they will).

I have a summary alias that kind of does similar things

  # summary: print a helpful summary of some typical metrics
  summary = "!f() { \
    printf \"Summary of this branch...\n\"; \
    printf \"%s\n\" $(git rev-parse --abbrev-ref HEAD); \
    printf \"%s first commit timestamp\n\" $(git log --date-order --format=%cI | tail -1); \
    printf \"%s latest commit timestamp\n\" $(git log -1 --date-order --format=%cI); \
    printf \"%d commit count\n\" $(git rev-list --count HEAD); \
    printf \"%d date count\n\" $(git log --format=oneline --format=\"%ad\" --date=format:\"%Y-%m-%d\" | awk '{a[$0]=1}END{for(i in a){n++;} print n}'); \
    printf \"%d tag count\n\" $(git tag | wc -l); \
    printf \"%d author count\n\" $(git log --format=oneline --format=\"%aE\" | awk '{a[$0]=1}END{for(i in a){n++;} print n}'); \
    printf \"%d committer count\n\" $(git log --format=oneline --format=\"%cE\" | awk '{a[$0]=1}END{for(i in a){n++;} print n}'); \
    printf \"%d local branch count\n\" $(git branch | grep -v \" -> \" | wc -l); \
    printf \"%d remote branch count\n\" $(git branch -r | grep -v \" -> \" | wc -l); \
    printf \"\nSummary of this directory...\n\"; \
    printf \"%s\n\" $(pwd); \
    printf \"%d file count via git ls-files\n\" $(git ls-files | wc -l); \
    printf \"%d file count via find command\n\" $(find . | wc -l); \
    printf \"%d disk usage\n\" $(du -s | awk '{print $1}'); \
    printf \"\nMost-active authors, with commit count and %%...\n\"; git log-of-count-and-email | head -7; \
    printf \"\nMost-active dates, with commit count and %%...\n\"; git log-of-count-and-day | head -7; \
    printf \"\nMost-active files, with churn count\n\"; git churn | head -7; \
  }; f"

> The 20 most-changed files in the last year. The file at the top is almost always the one people warn me about. “Oh yeah, that file. Everyone’s afraid to touch it.”

The most changed file is the one people are afraid of touching?

Some nice ideas but the regexes should include word boundaries. For example:

git log -i -E --grep="\b(fix|fixed|fixes|bug|broken)\b" --name-only --format='' | sort | uniq -c | sort -nr | head -20

I have a project with a large package named "debugger". The presence of "bug" within "debugger" causes the original command to go crazy.

I wouldn't trust "commit counts." The quality and content of a "commit" can vary widely between developers. I have one guy on my team who commits only working code that has been thoroughly tested locally, another guy who commits one line changes that often don't work, only to be followed by fixes, and more fixes. His "commits" have about 1/100th of the value of the first guy.

> One caveat: squash-merge workflows compress authorship. If the team squashes every PR into a single commit, this output reflects who merged, not who wrote. Worth asking about the merge strategy before drawing conclusions.

In my experience, when the team doesn't squash, this will reflect the messiest members of the team.

The top committer on the repository I maintain has 8x more commits than the second one. They were fired before I joined and nobody even remembers what they did. Git itself says: not much, just changing the same few files over and over.

Of course if nobody is making a mess in their own commits, this is not an issue. But if they are, squash can be quite more truthful.

Rather than using an LLM to write fluffy paragraphs explaining what each command does and what it tells them, the author should have shown their output (truncated if necessary)

For "what changes the most", in my project it's package.json / lock (because of automatic dependency updates) and translation / localization files; I'd argue that's pretty normal and healthy.

For the "bus factor", there's one guy and then there's me, but I stopped being a primary contributor to this project nearly two years ago, lol.

I just finished¹ building an experimental tool that tries to figure out if a repo is slopware or not just by looking at it's git history (plus some GitHub activity data).

The takeaway from my experiment is that you can really tell a lot by how / when / what people commit, but conclusions are very hard to generalize.

For example, I've also stumbled upon the "merge vs squash" issue, where squashes compress and mostly hide big chunks of history, so drawing conclusions from a squashed commit is basically just wild guessing.

(The author of course has also flagged this. But I just wanted to add my voice: yeah, careful to generalize.)

¹ Nothing is ever finished.

Instead of focusing on the top 20 files, you can map the entire codebase with data taken from git log using ArcheoloGit [1].

[1]: https://github.com/marmelab/ArcheoloGit

Dying or stabilizing?

Most good projects end up solving a problem permanently and if there is no salary to protect with bogus new features it is then to be considered final?

Ages ago, google released an algorithm to identify hotspots in code by using commit messages. https://github.com/niedbalski/python-bugspots

Ages ago google wrote an algorithm to detect hotspots by using commit messages, https://github.com/niedbalski/python-bugspots

> If the team squashes every PR into a single commit, this output reflects who merged, not who wrote.

Squash-merge workflows are stupid (you lose information without gaining anything in return as it was easily filterable at retrieval anyway) and only useful as a workaround for people not knowing how to use git, but git stores the author and committer names separately, so it doesn't matter who merged, but rather whether the squashed patchset consisted of commits with multiple authors (and even then you could store it with Co-authored-by trailers, but that's harder to use in such oneliners).

For more insights on Git, check out https://github.com/nolasoft/okgit

Trusting the messages to contain specific keywords seems optimistic. I don't think I used "emergency" or "hotfix" ever. "Revert" is some times automatically created by some tools (E.g. un-merging a PR).

These are some helpful heuristics, thanks.

This list is also one of many arguments for maintaining good Git discipline.

superficial. If I have to unfuck the backend 10 times a week in our API adapter, then these commands will show me constantly changing the API adapter, although it's the backend team constantly fixing their own bugs

I put it into a gist :)

https://gist.github.com/aeimer/8edc0b25f3197c0986d3f2618f036...

> The 20 most-changed files in the last year. The file at the top is almost always the one people warn me about. “Oh yeah, that file. Everyone’s afraid to touch it.”

I've got my Emacs set up to display next to every file that is versioned the number of commits that file has been modified in (for the curious: using a modified all-the-icons-ivy-rich + custom elisp code + custom Bash scripts I wrote and it's trickier than it seems to do in a way that doesn't slows everything down). For example in the menu to open a file or open a recently visited file etc.: basically in every file list, in addition to its size, owner, permissions, etc. I also add the number of commits if it's a versioned file.

I like the fix/bug/broken search in TFA to see where the bugs gather.

Nice! Will probably adopt this, seems to give a great overview!

> The 20 most-changed files in the last year. The file at the top is almost always the one people warn me about.

What a weird check and assumption.

I mean, surely most of the "20 most-changed files" will be README and docs, plus language-specific lock-files etc. ?

So if you're not accounting for those in your git/jj syntax you're going to end up with an awful lot of false-positive noise.

Just looking at how often a file changes without knowing how big the file is seems a bit silly. Surely it should be changes/line or something?

Great tips, added to notes.txt for future use ..

Another one I do, is:

    $alias gss='git for-each-ref --sort=-committerdate'

    $gss

    ce652ca83817e83f6041f7e5cd177f2d023a5489 commit refs/heads/project-feature-development
    ce652ca83817e83f6041f7e5cd177f2d023a5489 commit refs/remotes/origin/project-feature-development
    1ef272ea1d3552b59c3d22478afa9819d90dfb39 commit refs/remotes/origin/feature/feature-removal-from-good-state
    c30b4c67298a5fa944d0b387119c1e5ddaf551f1 commit refs/remotes/origin/feature/feature-removal
    eda340eb2c9e75eeb650b5a8850b1879b6b1f704 commit refs/remotes/origin/HEAD
    eda340eb2c9e75eeb650b5a8850b1879b6b1f704 commit refs/remotes/origin/main
    3f874b24fd49c1011e6866c8ec0f259991a24c94 commit refs/heads/project-bugfix-emergency
    ...

thank you - these are useful

I was curious what information I could glean from these for some popular repos. Caveat: I'm primarily an low-level embedded developer so I don't interface with large open source projects at the source level very often (other than occasionally the linux kernel). I chose some projects at random that I use.

*Mainline linux*

Most changed files: pretty much what I expected for 1 and 2... the "cutting edge" of Linux development over other OSes -- bpf and containers. The bpf verifier and AMD GPU driver might get a boost in this list due to sheer LoCs in those files (26K and 14K respectively). An intel equivalent of amdgpu_dm is #21 in the list (drivers/gpu/drm/i915/display/intel_display.c) and nvidia is nowhere to be seen (presumably due to out-of-tree modules/blobs?).

    186 kernel/bpf/verifier.c
    174 fs/namespace.c
    162 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
    161 kernel/sched/ext.c
    159 fs/f2fs/f2fs.h

    10399 Christoph Hellwig -> I only know his name because of drama last year regarding rust bindings to DMA subsystem
     8481 Mauro Carvalho Chehab -> I also know his name from the classic "Mauro, shut the fuck up!" Linus rant
     8413 Takashi Iwai -> Listed as maintainer for sound subsystem, I think he manages ALSA
     8072 Al Viro -> His name is all over bunch of filesystem code

    1477 drivers/gpu/drm/i915/intel_display.c
    1406 MAINTAINERS
    1390 sound/pci/hda/patch_realtek.c
    1102 drivers/gpu/drm/i915/i915_drv.h
     943 arch/x86/kvm/x86.c
     928 mm/page_alloc.c
     871 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
     862 drivers/gpu/drm/i915/i915_reg.h
     840 fs/btrfs/inode.c

Most changed files: IR autovectorization code, riscv heuristics tables, and C++ template handling (pt.c is "paramaterized types").

    152 gcc/tree-vect-stmts.cc
    145 gcc/config/riscv/riscv.cc
    131 gcc/tree-vect-loop.cc
    116 gcc/cp/pt.cc

   1017 gcc/dwarf2out.c
    885 gcc/config/i386/i386.c
    796 gcc/cp/cp-tree.h
    740 gcc/config/rs6000/rs6000.c
    720 gcc/cp/pt.c

This has not told me much other than where most of the functionality of this project lies.

Bus factor: Pretty huge. Not really an issue in this case due to lack of development I guess.

    3298  Olivier Fourdan
     530  Anonymous
     319  Xfce Bot
     121  Jasper Huijsmans

I think these massive open projects (excl xfwm) are generally pretty consistent code quality across the heavily trodden areas because of the amount of manpower available to refactor the pain points. I've yet to see an example of "god help you if you have to change that file" in e.g. linux, but I have of course seen that situation many times in large proprietary codebases.