hq

hq is a command-line HCL processor.

install

This will install an hq binary on your system:

$ cargo install hq-rs

usage

Here is an example HCL file:

some_attr = {
    foo = [1, 2]
    bar = true
}

some_block "some_block_label" {
    attr = "value"
}

some_block "another_block_label" {
    attr = "another_value"
}

You can query the attribute(s) and block(s) in an HCL file like so:

$ cat example.hcl | hq '.some_attr'

{
  foo = [
    1,
    2
  ]
  bar = true
}

$ cat example.hcl | hq '.some_attr.foo'

[
  1,
  2
]

$ cat example.hcl | hq '.some_block'

some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}

$ cat example.hcl | hq '.some_block[label="some_block_label"].attr'

"value"

$ cat example.hcl | hq '.some_block[label="another_block_label"].attr'

"another_value"

Or read directly from a file by passing read -f:

$ hq read -f example.hcl '.some_block'

some_block "some_block_label" {
  attr = "value"
}
some_block "another_block_label" {
  attr = "another_value"
}

You can modify HCL (even HCL that is formatted and contains comments) like so:

$ cat example.hcl | hq write '.fmt_block.first_formatted_field="something_new"'

some_attr = {
    foo = [1, 2]
    bar = true
}

some_block "some_block_label" {
    attr = "value"
}

some_block "another_block_label" {
    attr = "another_value"
}

# this is a block comment
fmt_block "fmt_label" {
    # this is a body comment
    # this is another body comment

    # this is a third body comment
    first_formatted_field  = "something_new"
    second_formatted_field = "second_value"
}

Modifications can also be written directly to a file by passing -i (inline) and -f (file):

$ hq write -i -f example.hcl '.fmt_block.first_formatted_field="something_written_inline"'

$ hq read -f example.hcl .fmt_block.first_formatted_field
"something_written_inline"