Nim library to infer/generate command-line-interfaces / option / argument parsing; Docs at (by c-blake)

Cligen Alternatives

Similar projects and alternatives to cligen

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a better cligen alternative or higher similarity.

cligen reviews and mentions

Posts with mentions or reviews of cligen. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2024-01-12.
  • CLI user experience case study
    12 projects | | 12 Jan 2024
    There is also generating the whole thing from a function signature (e.g. ) since then CLauthors need not learn a new spec language, but then CLauthors must add back in helpful usage metadata/semantics and still need to learn a library API (but I like how those two things can be "gradual"). It's a hard space in which to find perfection, but I wish you luck in your attempt!
  • Things I've learned about building CLI tools in Python
    16 projects | | 24 Oct 2023
    cligen also allows End-CL-users to adjust colorization of --help output like using something like

    Last I knew, the argparse backing most Py CLI solutions did not support such easier (for many) to read help text, but the PyUniverse is too vast to be sure without much related work searching.

  • Removing Garbage Collection from the Rust Language (2013)
    9 projects | | 11 Sep 2023
    20 milliseconds? On my 7 year old Linux box, this little Nim program runs to completion in 275 microseconds when fully statically linked with musl libc on Linux. That's with a stripped environment (with `env -i`). It takes more like 318 microseconds with my usual 54 environment variables. The program only does about 17 system calls, though.

    Additionally, makes decent CLI tools a real breeze. If you like some of Go's qualities but the language seems too limited, you might like Nim: I generally find getting good performance much less of a challenge with Nim, but Nim is undeniably less well known with a smaller ecosystem and less corporate backing.

  • Writing Small CLI Programs in Common Lisp (2021)
    5 projects | | 5 Sep 2023
    If you find this article interesting and are curious about Nim then you would probably also be curious about

    That allows adding just 1-line to a module to add a pretty complete CLI and then a string per parameter to properly document options (assuming an existing API using keyword arguments).

    It's also not hard to compile & link a static ELF binary with Nim.. I do it with MUSL libc on Linux all the time. I just toss into my ~/.config/nim/nim.cfg:

        @if musl:  # make nim c -d:musl .. foo static-link `foo` with musl
  • GNU Parallel, where have you been all my life?
    19 projects | | 21 Aug 2023
    Sure. No problem.

    Even Windows has popen these days. There are some tiny popenr/popenw wrappers in

    Depending upon how balanced work is on either side of the pipe, you usually can even get parallel speed-up on multicore with almost no work. For example, there is no need to use quote-escaped CSV parsing libraries when you just read from a popen()d translator program producing an easier format:

  • The Bipolar Lisp Programmer
    3 projects | | 11 Aug 2023
    Nim is terse yet general and can be made even more so with effort. E.g., You can gin up a little framework that is even more terse than awk yet statically typed and trivially convertible to run much faster like

    You can statically introspect code to then generate related/translated ASTs to create nearly frictionless helper facilities like .

    You can do all of this without any real run-time speed sacrifices, depending upon the level of effort you put in / your expertise. Since it generates C/C++ or Javascript you get all the abilities of backend compilers almost out of the box, like profile-guided-optimization or for JS JIT compilation.

  • Ask HN: Why did Nim not catch-on like wild fire as Rust did?
    16 projects | | 25 Jun 2023
    I don't know about all your other questions, but the CLI framework seems much lower effort / ceremony than even Rust's `argh` and is just about as old as `clap` (both started 8 years ago in 2015).

    There are over 50 CLI utilities at, many of which do something novel rather than just "re-doing ls/find/cat with a twist". While they are really more an "ls/ps construction toolkits" with some default configs to get people going, I think and are nicer than Rust alternatives. I mention these since you seem interested in such tools.

    16 projects | | 25 Jun 2023
    It's more that those tools were what come to mind when I specifically think of my exposure to the existence of rust. Its perhaps not that the tools were there, but that they were well known (and known for being written in rust).

    Anecdatapoint - I've never heard of literally a single one of the utilities listed on the bu page.

    Regarding cligen, right from the start clap wins on producing idiomatic output. Compare:

  • Zig and Rust
    6 projects | | 27 Mar 2023
    >Does nim have anything as polished and performant as clap and serde?

    "Polished" and "high quality" are more subjective/implicitly about adoption, IMO. "Performant" has many dimensions. I just tested the Nim vs clap: cligen used 5X less object file space (with all size optimization tweaks enabled in both), 20% less run-time memory for large argument lists, and the same run-time per argument (with march=native equivalents on both, within statistical noise). cligen has many features - "did you mean?/suggestions", color generated help and all that - I do not see obvious feature in clap docs missing in cligen. The Nim binary serde showing is unlikely as good but there are like 10 JSON packages and that seems maybe your primary concern.

    More to add color your point than disagree (and follow up on my "adoption") - your ideas about polish, quality, docs, etc. are part of feedback loop(s) you mentioned. More users => Users complain (What is confusing? What is missing? etc.) => things get fixed/cleaned up/improved => More users. Besides "performant" being multi-dimensional, the feedback loop is more of a "cyclic graph". :-) While I probably prefer Nim as much or more as @netbioserror, I am not too shocked by the mindshare capture. It seems to happen every 5..10 years or so in prog.langs.

    While many of your points are not invalid, tech is also a highly hype-driven & fad-driven realm. In my experience, the more experience with this meta-feature that someone has, the more skeptical they are of the latest thing (more rounds of regret, etc.). Also, that feedback graph is not a pure good. Things can get too popular too quickly with near permanent consequences. ipv4 got popular so quickly that we are still mostly stuck on it 40 years later as ipv6 struggles for penetration. Whatever your favorite PL is, it may also grow features too fast.

  • Self Hosted SaaS Alternatives
    17 projects | | 5 Mar 2023
    You are welcome. Thanks are too rarely offered. :-)

    You may also be interested in word stemming ( such as used by snowball stemmer in ) or other NLP techniques, but I don't know how internationalized/multi-lingual that stuff is, but conceptually you might want "series of stemmed words" to be the content fragments of interest.

    Similarity scores have many applications. Weights on graph of cancelled downloads ranked by size might be one. :)

    Of course, for your specific "truncation" problem, you might also be able to just do an edit distance against the much smaller filenames and compare data prefixes in files or use a SHA256 of a content-based first slice. ( There are edit distance algos in Nim in as well as in ).

    Or, you could do a little program like ndup/sh/ndup to create a "mirrored file tree" of such content-based slices then you could use any true duplicate-file finder (like on the little signature system to identify duplicates and go from path suffixes in those clusters back to the main filesystem. Of course, a single KV store within one or two files would be more efficient than thousands of tiny files. There are many possibilities.

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Basic cligen repo stats
3 days ago

c-blake/cligen is an open source project licensed under ISC License which is an OSI approved license.

The primary programming language of cligen is Nim.

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