Run an algorithm using 'qgis_process': pipe-friendly wrapper

qgis_run_algorithm_p() wraps qgis_run_algorithm(), passing its first argument to the first argument of the QGIS algorithm. This makes it more convenient in a pipeline (hence '_p' in the name).

Usage

qgis_run_algorithm_p(
  .data,
  algorithm,
  ...,
  .select = "OUTPUT",
  .clean = TRUE,
  .quiet = TRUE
)

Arguments

.data

Passed to the first input of algorithm. If .data is a qgis_result (the result of a previous processing step), .data[[.select]] is passed instead.

algorithm

A qualified algorithm name (e.g., "native:buffer").

...

Other algorithm arguments. These values are evaluated once and immediately, so you shouldn't call qgis_tmp_file() here.

.select

String. The name of the element to select from .data if the latter is a qgis_result. Defaults to "OUTPUT".

.clean

Logical. Should an incoming qgis_result be cleaned (using qgis_clean_result()) after processing?

.quiet

Use FALSE to get extra output from 'qgis_process'. This can be useful in debugging.

Value

A qgis_result object.

Details

Uses qgis_function() under the hood.

See also

Other functions to run one geoprocessing algorithm: qgis_run_algorithm()

Examples

system.file(
  "longlake/longlake_depth.gpkg",
  package = "qgisprocess"
) |>
  qgis_run_algorithm_p(
    "native:buffer",
    DISTANCE = 10
  )
#> Argument `SEGMENTS` is unspecified (using QGIS default value).
#> Using `END_CAP_STYLE = "Round"`
#> Using `JOIN_STYLE = "Round"`
#> Argument `MITER_LIMIT` is unspecified (using QGIS default value).
#> Argument `DISSOLVE` is unspecified (using QGIS default value).
#> Argument `SEPARATE_DISJOINT` is unspecified (using QGIS default value).
#> Using `OUTPUT = qgis_tmp_vector()`
#> <Result of `qgis_run_algorithm("native:buffer", ...)`>
#> List of 1
#>  $ OUTPUT: 'qgis_outputVector' chr "/tmp/Rtmp7nb1k0/file2b044d88ac6c/file2b04220d1297.gpkg"