Add flag to measure recipe execution time by GeorgeLS · Pull Request #3099 · casey/just

GeorgeLS · 2026-02-24T18:17:23Z

As part of this PR, I have added a new simple feature for printing elapsed time of recipes.
The output format is really simple: <materialized_recipe> (<elapsed_time>).

Here's an example of two recipes and the output for those:

Recipe 1:

test:
    ...

Output:

test (Duration: <time>)

Recipe 2:

test arg:
    ...

Invocation:

just test server

Output:

test server (Duration: <time>)

The duration is reported as soon as the recipe finishes.

Please note that if you have recursive recipes where you basically invoke just inside the recipe, the time reporting won't be propagated to the recursive invocation. If you want to measure the inner-invoked recipe, just pass -t/--time to the inner just invocation.

casey

See comments! There will be conflicts when rebasing, but the changes to the completion files won't be needed.

Signed-off-by: George Liontos <georgeliontos98@gmail.com>

casey

See comments! Also, this should have a test.

casey · 2026-03-31T03:24:27Z

+      let suffix = color.suffix();
+      let recipe_name = self.name.lexeme();
+
+      eprintln!("{prefix}{recipe_name} (Duration: {elapsed:.2?}){suffix}");


Add a four-character marker, so it doesn't get lost in other output, also, the display implementation shouldn't be used:

Suggested change

eprintln!("{prefix}{recipe_name} (Duration: {elapsed:.2?}){suffix}");

eprintln!("{prefix}---> {recipe_name} completed in {:.3}s{suffix}", elapsed.as_secs_f64());

Three digits of precision seems good since milliseconds is a common unit.

You mean that I shouldn't use the Debug implementation.
The reason I used the Debug implementation, is because it is more human friendly.
It automatically converts to the closest unit of time that has elapsed.

For example, the output is going to be one of:

seconds

milliseconds

nanoseconds

microseconds

I'm leaving this open for discussion for now. I have added tests as well.

I agree that it would be more user-friendly to do that, but the debug implementation is unstable, meaning that there are no guarantees that it might not change in the future.

Yeah from that perspective I agree. I will update the code as you suggested.

casey · 2026-04-05T05:11:56Z

Nice, thank you!

##### [\`1.49.0\`](https://github.com/casey/just/blob/HEAD/CHANGELOG.md#1490---2026-04-04) ##### Added - Add `--time` to print recipe execution time ([#3099](casey/just#3099) by [GeorgeLS](https://github.com/GeorgeLS)) - Add user-defined functions ([#3247](casey/just#3247) by [casey](https://github.com/casey)) - Add just skill for agents ([#3241](casey/just#3241) by [casey](https://github.com/casey)) - Allow expressions in confirm attribute ([#3238](casey/just#3238) by [begoon](https://github.com/begoon)) - Add `--complete-aliases` ([#3235](casey/just#3235) by [casey](https://github.com/casey)) - Add `--justfile-name` to configure justfile filename ([#3234](casey/just#3234) by [casey](https://github.com/casey)) - Add `runtime_directory()` function ([#3226](casey/just#3226) by [barskern](https://github.com/barskern)) - Add `--evaluate-format` ([#3221](casey/just#3221) by [casey](https://github.com/casey)) - Allow passing variable and module paths to `--evaluate` ([#3219](casey/just#3219) by [casey](https://github.com/casey)) - Add `--indentation` ([#3215](casey/just#3215) by [casey](https://github.com/casey)) - Add `module_file()` and `module_directory()` to readme ([#2965](casey/just#2965) by [cspotcode](https://github.com/cspotcode)) - Add Nix flake ([#2972](casey/just#2972) by [neunenak](https://github.com/neunenak)) ##### Fixed - Allow reading `.env` from special files ([#3250](casey/just#3250) by [casey](https://github.com/casey)) - Load environment files in submodules ([#3243](casey/just#3243) by [casey](https://github.com/casey)) - Avoid process substitution in bash completion script ([#3217](casey/just#3217) by [casey](https://github.com/casey)) - Dont pass shell name to powershell ([#3209](casey/just#3209) by [casey](https://github.com/casey)) ##### Misc - Add just implementation of rule110 ([#3249](casey/just#3249) by [casey](https://github.com/casey)) - Add instructions for skill to readme ([#3245](casey/just#3245) by [casey](https://github.com/casey)) - Remove comma in readme ([#3244](casey/just#3244) by [casey](https://github.com/casey)) - Move bash completion registration script into etc/ ([#3242](casey/just#3242) by [casey](https://github.com/casey)) - Avoid to\_string\_lossy in directory function tests ([#3232](casey/just#3232) by [casey](https://github.com/casey)) - Add installation overview ([#3231](casey/just#3231) by [casey](https://github.com/casey)) - Warn if invocation directory or justfile path is not Unicode ([#3230](casey/just#3230) by [casey](https://github.com/casey)) - Don't use make syntax highlighting in vim ([#2906](casey/just#2906) by [alerque](https://github.com/alerque)) - Fix Name Display impl to pad correctly ([#3222](casey/just#3222) by [casey](https://github.com/casey)) - Rename `evaluate_target` to `evaluation_target` ([#3220](casey/just#3220) by [casey](https://github.com/casey)) - Include recipe path in verbose output ([#3213](casey/just#3213) by [behnam-oneschema](https://github.com/behnam-oneschema)) - Move recipe methods onto resolved recipe ([#3214](casey/just#3214) by [casey](https://github.com/casey)) - Document that `semver_matches()` returns strings ([#3212](casey/just#3212) by [casey](https://github.com/casey)) - Build riscv64 release binaries ([#3210](casey/just#3210) by [gounthar](https://github.com/gounthar)) - Include shell name in I/O error messages ([#3208](casey/just#3208) by [casey](https://github.com/casey)) - Don't print signal error message if recipe has `[no-exit-message]` ([#3200](casey/just#3200) by [imp-joshi](https://github.com/imp-joshi)) --- ##### [\`1.48.1\`](https://github.com/casey/just/blob/HEAD/CHANGELOG.md#1481---2026-03-27) - Fix bash completion of command lines containing `:` ([#3205](casey/just#3205) by [casey](https://github.com/casey)) - Call zsh completion function when first auto-loaded ([#3199](casey/just#3199) by [casey](https://github.com/casey)) - Fix `--set` missing value error message interpolation ([#3198](casey/just#3198) by [cuiweixie](https://github.com/cuiweixie)) - Add `#compdef` to zsh completion script ([#3197](casey/just#3197) by [casey](https://github.com/casey)) - Add instructions for alias completions in bash ([#3190](casey/just#3190) by [casey](https://github.com/casey)) - Remove redundant clap derive attributes ([#3183](casey/just#3183) by [casey](https://github.com/casey)) - Move files into etc/ ([#3182](casey/just#3182) by [casey](https://github.com/casey)) - Update stable features in readme ([#3181](casey/just#3181) by [casey](https://github.com/casey)) --- ##### [\`1.48.0\`](https://github.com/casey/just/blob/HEAD/CHANGELOG.md#1480---2026-03-23) ##### Added - Build docker images ([#3174](casey/just#3174) by [casey](https://github.com/casey)) - Dynamically complete recipes for `--usage` ([#3172](casey/just#3172) by [casey](https://github.com/casey)) - Dynamically complete groups ([#3171](casey/just#3171) by [casey](https://github.com/casey)) - Dynamically complete recipes and variables ([#3169](casey/just#3169) by [casey](https://github.com/casey)) - Complete appropriate filetypes ([#3168](casey/just#3168) by [casey](https://github.com/casey)) - Allow overriding variables in submodules ([#3151](casey/just#3151) by [casey](https://github.com/casey)) - Add `--json` as synonym for `--dump --dump-format json` ([#3143](casey/just#3143) by [casey](https://github.com/casey)) ##### Changed - Stabilize lazy evaluation ([#3180](casey/just#3180) by [casey](https://github.com/casey)) - Switch to dynamic completion engine ([#3167](casey/just#3167) by [casey](https://github.com/casey)) - Respect PATH and PATHEXT when running commands on Windows ([#3160](casey/just#3160) by [casey](https://github.com/casey)) - Make `which()` and `require()` respect PATHEXT on Windows ([#3144](casey/just#3144) by [casey](https://github.com/casey)) ##### Misc - Add completion script installation instructions ([#3178](casey/just#3178) by [casey](https://github.com/casey)) - Fix readme typo ([#3176](casey/just#3176) by [Rohan5commit](https://github.com/Rohan5commit)) - Remove Vagrantfile ([#3173](casey/just#3173) by [casey](https://github.com/casey)) - Fix signal handling typo ([#3170](casey/just#3170) by [Rohan5commit](https://github.com/Rohan5commit)) - Add cargo-binstall installation instructions ([#3165](casey/just#3165) by [casey](https://github.com/casey)) - Fix typos ([#3162](casey/just#3162) by [casey](https://github.com/casey)) - Readme typo: forground ([#3161](casey/just#3161) by [Rohan5commit](https://github.com/Rohan5commit)) - Use clap derive to parse arguments ([#3158](casey/just#3158) by [casey](https://github.com/casey)) - Fix readme typo ([#3156](casey/just#3156) by [teee32](https://github.com/teee32)) - Document that path\_exists() returns strings ([#2946](casey/just#2946) by [cspotcode](https://github.com/cspotcode)) - Remove version references from readme headings ([#3153](casey/just#3153) by [casey](https://github.com/casey)) - Fix readme typo ([#3152](casey/just#3152) by [Rohan5commit](https://github.com/Rohan5commit)) - Fix variadic parameter typo in readme ([#3150](casey/just#3150) by [casey](https://github.com/casey)) - Fix readme typo ([#3148](casey/just#3148) by [Rohan5commit](https://github.com/Rohan5commit)) - Avoid conditional compilation ([#3145](casey/just#3145) by [casey](https://github.com/casey)) - Update VS Code extension in Chinese readme ([#2984](casey/just#2984) by [A-moment096](https://github.com/A-moment096)) - Change replace wording in readme ([#3137](casey/just#3137) by [Rohan5commit](https://github.com/Rohan5commit)) - Document recipe metadata ([#3142](casey/just#3142) by [casey](https://github.com/casey))

GeorgeLS mentioned this pull request Feb 24, 2026

Ability to measure execution time for recipes #3048

Closed

casey requested changes Mar 30, 2026

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Comment thread src/config.rs Outdated

Comment thread completions/just.bash Outdated

Comment thread src/recipe.rs Outdated

Comment thread src/recipe.rs Outdated

GeorgeLS force-pushed the master branch from ed701a5 to 4e66c69 Compare March 30, 2026 18:26

GeorgeLS requested a review from casey March 30, 2026 18:30

Add flag to measure recipe execution time

9a869c7

Signed-off-by: George Liontos <georgeliontos98@gmail.com>

GeorgeLS force-pushed the master branch from 183702a to 9a869c7 Compare March 30, 2026 18:51

casey requested changes Mar 31, 2026

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GeorgeLS and others added 5 commits March 31, 2026 12:56

Address PR comments, added tests

fe20809

Merge branch 'master' into master

ac21c55

Address PR comments

0731dab

Merge branch 'master' into master

9cef09c

Simplify tests

3f897ed

casey enabled auto-merge (squash) April 5, 2026 05:10

casey merged commit 4914779 into casey:master Apr 5, 2026
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Add flag to measure recipe execution time#3099

Add flag to measure recipe execution time#3099
casey merged 6 commits into
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	eprintln!("{prefix}{recipe_name} (Duration: {elapsed:.2?}){suffix}");
	eprintln!("{prefix}---> {recipe_name} completed in {:.3}s{suffix}", elapsed.as_secs_f64());

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