feat: add import yml flag

[tarunps]

Adds the functionality to import environment.yml during pixi init.
Closes #131

[wolfv]

What does the usage look like? Maybe we can already add a little bit to the docs? :) Awesome feature!

[tarunps]

What does the usage look like? Maybe we can already add a little bit to the docs? :) Awesome feature!

$ pixi init -i /path/to/environment.yml

[baszalmstra]

This seems strange to me. We just created the project above!

[ruben-arts]

Use this feature to benchmark :

Benchmark 1: pixi init -i environment-dev-extra.yml
  Time (mean ± σ):      1.686 s ±  0.022 s    [User: 3.009 s, System: 3.709 s]
  Range (min … max):    1.662 s …  1.736 s    10 runs
 
Benchmark 2: micromamba create --file environment-dev-extra.yml -p ./.env --yes
  Time (mean ± σ):      5.688 s ±  0.137 s    [User: 11.266 s, System: 1.676 s]
  Range (min … max):    5.485 s …  5.885 s    10 runs
 
Benchmark 3: conda env create -f environment-dev-extra.yml -p ./.env
  Time (mean ± σ):     46.115 s ±  5.999 s    [User: 43.808 s, System: 1.861 s]
  Range (min … max):   39.113 s … 59.391 s    10 runs
 
Summary
  pixi init -i environment-dev-extra.yml ran
    3.37 ± 0.09 times faster than micromamba create --file environment-dev-extra.yml -p ./.env --yes
   27.35 ± 3.58 times faster than conda env create -f environment-dev-extra.yml -p ./.env

pixi 0.14.0
micromamba 1.5.1
conda 4.13.0

[baszalmstra]

Nice! And thats including generating a lock-file!

Did you have warm or cold caches?

[ruben-arts]

hyperfine --warmup 1 --prepare 'rm pixi.* .pixi -rf' 'pixi init -i environment-dev-extra.yml' --prepare 'rm ./.env -r' 'micromamba create --file environment-dev-extra.yml -p ./.env --yes' --prepare 'rm ./.env -r' 'conda env create -f environment-dev-extra.yml -p ./.env'

This was the command including the warmup command, so the caches are blazingly hot.

That includes generating the environment( and lock for pixi). Pixi also does the translation from env.yml to pixi.toml. But that is too fast to measure in this scale.

[ruben-arts]

That was with conda 4.13, latest is conda 24.1.1 So I reran it:

Benchmark 1: pixi init -i environment-dev-extra.yml
  Time (mean ± σ):      1.747 s ±  0.046 s    [User: 3.033 s, System: 3.713 s]
  Range (min … max):    1.670 s …  1.787 s    5 runs                            
                      
Benchmark 2: micromamba create --file environment-dev-extra.yml -p ./.env --yes
  Time (mean ± σ):      6.516 s ±  0.338 s    [User: 12.660 s, System: 1.949 s]
  Range (min … max):    6.198 s …  6.900 s    5 runs
 
Benchmark 3: conda env create -f environment-dev-extra.yml -p ./.env
  Time (mean ± σ):     17.895 s ±  0.212 s    [User: 16.057 s, System: 1.725 s]
  Range (min … max):   17.743 s … 18.266 s    5 runs
 
Summary
  pixi init -i environment-dev-extra.yml ran
    3.73 ± 0.22 times faster than micromamba create --file environment-dev-extra.yml -p ./.env --yes
   10.24 ± 0.30 times faster than conda env create -f environment-dev-extra.yml -p ./.env

Command:

hyperfine --warmup 1 --runs 5 --prepare 'rm pixi.* .pixi -rf' 'pixi init -i environment-dev-extra.yml' --prepare 'rm ./.env -r' 'micromamba create --file environment-dev-extra.yml -p ./.env --yes' --prepare 'rm ./.env -r' 'conda env create -f environment-dev-extra.yml -p ./.env' 

Versions:

pixi 0.14.0
micromamba 1.5.1
conda 24.1.1

[baszalmstra]

I think it would be good to crawl github a little for environment.yml files and seeing if we can actually import them.