pypyr.parser.tomlfile permalink

read toml file into context permalink

Take a path from the cli input argument, and read the toml file at that path into context. Strongly typed values in the source toml will translate into the pipeline context (in other words, integers will be integers, booleans will be booleans etc.). This lets you initialize the pipeline context from a toml file.

The input path can be relative or absolute. Relative paths are relative to the current working directory.

example permalink

Given a toml file like this, saved as ./sample-files/sample.toml:

#this is a toml example
echoMe = "this is a value from a toml file"
key1 = "value1"
key2 = "value2"
keyBool = true
keyInt = 123

[mytable]
mytablekey = "{key1} and {key2} and {key3}"

And given a pipeline like this, arbitrarily saved as ./tomlfile-parser.yaml:

# ./tomlfile-parser.yaml
context_parser: pypyr.parser.tomlfile
steps:
  # echoMe is set in the toml input file
  - pypyr.steps.echo

  - name: pypyr.steps.set
    comment: use the int from toml as a strongly typed int
    in:
      set:
        intResult: !py keyInt * 2
        key3: value3
  
  - name: pypyr.steps.echo
    comment: print out result of int calculation
    in:
      echoMe: "strongly typed happens automatically: {intResult}"

  - name: pypyr.steps.echo
    comment: access a key in a table
             formatting expressions in toml string will work
    in:
      echoMe: "{mytable[mytablekey]}"
    
  - name: pypyr.steps.echo
    comment: only run if input bool is true
    run: '{keyBool}'
    in:
      echoMe: you'll only see me if the bool was true

You can run this pipeline as follows:

term
$ pypyr tomlfile-parser ./sample-files/sample.toml
this is a value from a toml file
strongly typed happens automatically: 246
value1 and value2 and value3
you'll only see me if the bool was true

Notice that mytable.mytablekey uses pypyr {substitution} expressions where key1 and key2 are set in the toml file itself, and key3 is set in the pypyr pipeline with pypyr.steps.set.

If you change the keyBool bool to false in the toml input file, the last step won’t run anymore because the run condition is False.

term
$ pypyr tomlfile-parser ./sample-files/sample.toml
this is a value from a toml file
strongly typed happens automatically: 246
value1 and value2 and value3

spaces in file path permalink

Depending on your O/S, shell and file-system, it’s up to you to deal with special characters in the file-name.

Taking either zsh or fish as an example, all of the following will work:

term
$ pypyr mypipeline ./testfiles/sample.toml
$ pypyr mypipeline ./test files/sample with space.toml
$ pypyr mypipeline "./test files/sample with space.toml"
$ pypyr mypipeline ./"test files"/"sample with space.toml"

see also

last updated on .