Post #3901607

I just found a new (to me) Justfile technique that brings me joy: Arguments as flag. The scenario: * I want to call one of two available NPM commands through a Justfile. * The NPM command is either Biome in check mode, or Biome in fix mode; respectively called `biome` and `biome:fix`. * I want to avoid creating two Just recipes, just because it feels better than having two (my current situation). The solution: 1. Create a recipe argument `fix`, written as flag `-f` or `--fix` on the command-line. 2. The value of argument `fix` is an empty string by default, or string `:fix` when passed. 3. The value of `fix` gets appended to the string 'biome', where this string represents the name of the NPM script we call. 4. This means that we can call both NPM scripts from a single Just recipe, all by passing an optional flag. 5. Profit! ``` # … (omitted here is a recipe called "run" that runs NPM through Docker) # Run Biome, optionally applying fixes. [group('commands')] [arg('fix', short='f', long='fix', value=':fix', help='Pass to apply automatic fixes.')] biome fix='': (run 'biome' + fix) ``` NB. I might turn this into a proper blog article later. #WebDev