Title:	Build Reproducible Analytical Pipelines with 'Nix'
Version:	0.10.1
Description:	Streamlines the creation of reproducible analytical pipelines using 'default.nix' expressions generated via the 'rix' package for reproducibility. Define derivations in 'R', 'Python' or 'Julia', chain them into a composition of pure functions and build the resulting pipeline using 'Nix' as the underlying end-to-end build tool. Functions to plot the pipeline as a directed acyclic graph are included, as well as functions to load and inspect intermediary results for interactive analysis. User experience heavily inspired by the 'targets' package.
License:	GPL (≥ 3)
Encoding:	UTF-8
URL:	https://github.com/ropensci/rixpress/, https://docs.ropensci.org/rixpress/
BugReports:	https://github.com/ropensci/rixpress/issues/
Depends:	R (≥ 4.1.0)
Imports:	igraph, jsonlite, processx
RoxygenNote:	7.3.3
SystemRequirements:	Nix
Language:	en-GB
Suggests:	dplyr, ggdag, ggplot2, knitr, mockery, reticulate, rix, rmarkdown, testthat (≥ 3.0.0), usethis, visNetwork
Config/testthat/edition:	3
VignetteBuilder:	knitr
NeedsCompilation:	no
Packaged:	2025-10-14 13:35:54 UTC; brodrigues
Author:	Bruno Rodrigues [aut, cre], William Michael Landau [rev] (William reviewed the package (v. 0.2.0) for rOpenSci, see <https://github.com/ropensci/software-review/issues/706>), Anthony Martinez [rev] (Anthony reviewed the package (v. 0.2.0) for rOpenSci, see <https://github.com/ropensci/software-review/issues/625>)
Maintainer:	Bruno Rodrigues <bruno@brodrigues.co>
Repository:	CRAN
Date/Publication:	2025-10-14 14:00:02 UTC

Add an import statement to Python files in the _rixpress folder matching a Nix environment name

Description

This function appends a specified import statement to the end of each Python file within the ⁠_rixpress⁠ folder and its subdirectories, but only for files whose base name matches the provided Nix environment.

Usage

add_import(import_statement, nix_env, project_path = ".")

Arguments

Value

No return value; the function performs in-place modifications of the files.

See Also

Other python import: adjust_import()

Examples

## Not run: 
add_import("import numpy as np", "default.nix")
add_import("import numpy as np", "default.nix", project_path = "path/to/project")

## End(Not run)

Adjust Python import statements

Description

When calling rxp_populate(), a file containing Python import statements is automatically generated inside the ⁠_rixpress⁠ folder. For example, if the numpy package is needed, the file will include a line like "import numpy". However, Python programmers often write "import numpy as np" instead.

Usage

adjust_import(old_import, new_import, project_path = ".")

Arguments

Details

In some cases, the correct import statement is entirely different. For example, for the pillow package, the generated file will contain "import pillow", which is incorrect—Python code should import from the PIL namespace instead, e.g., "from PIL import Image".

Because these adjustments cannot be automated reliably, the adjust_import() function allows you to search and replace import statements programmatically. It reads each file in the ⁠_rixpress⁠ folder, performs the replacement, and writes the modified content back to the file.

Value

No return value; the function performs in-place modifications of the files.

See Also

Other python import: add_import()

Examples

## Not run: 
adjust_import("import pillow", "from PIL import Image")
adjust_import("import pillow", "from PIL import Image", project_path = "path/to/project")

## End(Not run)

Build environment variable export commands

Description

Generates shell export commands for setting environment variables before running the build script.

Usage

build_env_exports(env_var)

Arguments

Value

A string of export commands with line breaks, or "" if none.

Build hybrid source configuration for remote URL + local user functions

Description

Build hybrid source configuration for remote URL + local user functions

Usage

build_hybrid_src(url, user_functions)

Arguments

Value

Character Nix expression

Build language-specific execution commands

Description

Build language-specific execution commands

Usage

build_language_commands(
  lang,
  read_func,
  user_code,
  out_name,
  rel_path,
  serialize_str = NULL
)

Arguments

Value

Character vector of commands

Build local source configuration

Description

Build local source configuration

Usage

build_local_src(path, user_functions)

Arguments

Value

Character Nix expression

Build build_phase command

Description

Constructs the build-phase shell command for R, Python, or Julia.

Usage

build_phase(
  lang,
  read_func,
  user_code,
  out_name,
  path,
  user_functions = character(0),
  serialize_str = NULL
)

Arguments

Value

A string with the build phase commands.

Build remote source configuration

Description

Build remote source configuration

Usage

build_remote_src(url)

Arguments

Value

Character Nix expression

Build reticulate build phase

Description

Build reticulate build phase

Usage

build_reticulate_phase(r_command)

Arguments

Value

Character build phase

Build Nix src part

Description

Creates the src attribute for the Nix derivation. Handles both remote URLs (using nix-prefetch-url) and local paths (with optional user function scripts).

Usage

build_src_part(path, user_functions = character(0))

Arguments

Value

A string with the src Nix expression.

Build transfer command for py2r or r2py

Description

Build transfer command for py2r or r2py

Usage

build_transfer_command(out_name, expr_str, direction)

Arguments

Value

Character command

Build code import/source commands for user functions

Description

Creates language-specific commands to load user-defined function scripts.

Usage

build_user_code_cmd(user_functions, lang)

Arguments

Value

A string of import/source statements.

Clean user functions vector

Description

Removes empty character entries from the provided user_functions vector.

Usage

clean_user_functions(user_functions)

Arguments

Value

Character vector without empty strings.

Create rxp_derivation object

Description

Create rxp_derivation object

Usage

create_rxp_derivation(
  out_name,
  snippet,
  lang,
  user_functions,
  nix_env,
  env_var,
  encoder = NULL
)

Arguments

Value

rxp_derivation object

Extract dependencies for a derivation

Description

Extract dependencies for a derivation

Usage

extract_dependencies(deriv, type, name, all_derivs_names)

Arguments

Value

A character vector of dependency names

Extract dependencies from Julia script derivations

Description

Extract dependencies from Julia script derivations

Usage

extract_julia_dependencies(deriv, name, all_derivs_names)

Arguments

Value

A character vector of dependency names

Extract dependencies from markdown (Quarto/RMarkdown) derivations

Description

Extract dependencies from markdown (Quarto/RMarkdown) derivations

Usage

extract_markdown_dependencies(deriv, type, name, all_derivs_names)

Arguments

Value

A character vector of dependency names

Extract dependencies from Python script derivations

Description

Extract dependencies from Python script derivations

Usage

extract_python_dependencies(deriv, name, all_derivs_names)

Arguments

Value

A character vector of dependency names

Extract dependencies from R script derivations

Description

Extract dependencies from R script derivations

Usage

extract_r_dependencies(deriv, name, all_derivs_names)

Arguments

Value

A character vector of dependency names

Check if path is a remote URL

Description

Check if path is a remote URL

Usage

is_remote_url(path)

Arguments

Value

Logical

Helper function to generate a Nix derivation snippet

Description

Helper function to generate a Nix derivation snippet

Usage

make_derivation_snippet(
  out_name,
  src_snippet,
  base,
  build_phase,
  derivation_type,
  noop_build = FALSE
)

Arguments

Value

Character string with the formatted Nix derivation

Print method for derivation objects

Description

Print method for derivation objects

Usage

## S3 method for class 'rxp_derivation'
print(x, ...)

Arguments

Value

Nothing, prints a summary of the derivation object to the console.

See Also

Other utilities: rxp_copy(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_read(), rxp_trace()

Examples

## Not run: 
# d0 is a previously defined derivation
  print(d0)

## End(Not run)

Process serialize function for different languages

Description

Mirrors the behaviour of rxp_r/rxp_py/rxp_jl:

• R: supports bare symbol, character, or function; defaults to saveRDS

• Python: character function name, defaults to pickle.dump via with-open

• Julia: character function name, defaults to Serialization.serialize

Usage

process_encoder(encoder, lang, parent_env = parent.frame())

Arguments

Value

For R: function name string; For Py/Jl: NULL (use default) or function name string

Process read function for different languages

Description

Process read function for different languages

Usage

process_read_function(read_function, lang, parent_env = parent.frame())

Arguments

Value

Character string

Propagate no-op builds to dependent derivations

Description

Propagate no-op builds to dependent derivations

Usage

propagate_noop_builds(dag)

Arguments

Value

Updated DAG with propagated no-op flags

Generate the Nix derivation snippet for Python-R object transfer.

Description

This function constructs the build_phase and Nix derivation snippet based on the given parameters.

Usage

rxp_common_setup(out_name, expr_str, nix_env, direction)

Arguments

Value

A list with elements: name, snippet, type, additional_files, nix_env.

Copy derivations from the Nix store to current working directory

Description

When Nix builds a derivation, its output is saved in the Nix store located under ⁠/nix/store/⁠. Even though you can import the derivations into the current R session using rxp_read() or rxp_load(), it can be useful to copy the outputs to the current working directory. This is especially useful for Quarto documents, where there can be more than one input, as is the case for html output.

Usage

rxp_copy(derivation_name = NULL, dir_mode = "0755", file_mode = "0644")

Arguments

Value

Nothing, the contents of the Nix store are copied to the current working directory.

See Also

Other utilities: print.rxp_derivation(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_read(), rxp_trace()

Examples

## Not run: 
  # Copy all derivations to the current working directory
  rxp_copy()

  # Copy a specific derivation
  rxp_copy("mtcars")

  # Copy with custom permissions (e.g., make scripts executable)
  rxp_copy("my_deriv", dir_mode = "0755", file_mode = "0644")

  # Copy a Quarto document output with multiple files
  rxp_copy("my_quarto_doc")

## End(Not run)

Export DAG of pipeline and prepare it for rendering on CI

Description

This function generates a DOT file representation of the pipeline DAG, suitable for visualization, potentially on CI platforms. It is called by rxp_ga().

Usage

rxp_dag_for_ci(
  nodes_and_edges = get_nodes_edges(),
  output_file = "_rixpress/dag.dot"
)

Arguments

Value

Nothing, writes the DOT file to the specified output_file.

See Also

Other ci utilities: rxp_ga(), rxp_write_dag()

Examples

## Not run: 
  # Generate the default _rixpress/dag.dot
  rxp_dag_for_ci()


## End(Not run)

Export Nix store paths to an archive

Description

Creates a single archive file containing the specified Nix store paths and their dependencies. This archive can be transferred to another machine and imported into its Nix store.

Usage

rxp_export_artifacts(
  archive_file = "_rixpress/pipeline_outputs.nar",
  which_log = NULL,
  project_path = "."
)

Arguments

Value

Nothing, creates an archive file at the specified location.

See Also

Other archive caching functions: rxp_import_artifacts()

Examples

## Not run: 
  # Export the most recent build to the default location
  rxp_export_artifacts()

  # Export a specific build to a custom location
  rxp_export_artifacts(
    archive_file = "my_archive.nar",
    which_log = "20250510"
  )

## End(Not run)

Generic Nix expression builder for R, Python, and Julia data readers

Description

You should not call it directly, but instead use one of rxp_r_file(), rxp_py_file() or rxp_jl_file().

Usage

rxp_file(
  lang,
  name,
  path,
  read_function,
  user_functions = "",
  nix_env = "default.nix",
  env_var = NULL,
  encoder = NULL
)

Arguments

Details

Creates a Nix derivation that reads a file or folder of data using R, Python, or Julia. Handles user-defined functions, environment variables, and Nix environment specification.

Value

An object of class rxp_derivation.

Run a pipeline on GitHub Actions

Description

Run a pipeline on GitHub Actions

Usage

rxp_ga()

Details

This function puts a .yaml file inside the ⁠.github/workflows/⁠ folder on the root of your project. This workflow file expects both scripts generated by rxp_init(), gen-env.R and gen-pipeline.R to be present. If that's not the case, edit the .yaml file accordingly. Build artifacts are archived and restored automatically between runs. Make sure to give read and write permissions to the GitHub Actions bot.

Value

Nothing, copies file to a directory.

See Also

Other ci utilities: rxp_dag_for_ci(), rxp_write_dag()

Examples

## Not run: 
  rxp_ga()

## End(Not run)

Garbage Collect Rixpress Build Artifacts and Logs

Description

This function performs garbage collection on Nix store paths and build log files generated by rixpress. It can operate in two modes: full garbage collection (when keep_since = NULL) or targeted deletion based on log file age.

Usage

rxp_gc(
  keep_since = NULL,
  project_path = ".",
  dry_run = FALSE,
  timeout_sec = 300,
  verbose = FALSE,
  ask = TRUE
)

Arguments

Details

The function operates in two modes:

Full Garbage Collection Mode (keep_since = NULL):

• Runs nix-store --gc to delete all unreferenced store paths

• Does not delete any build log files

• Suitable for complete cleanup of unused Nix store paths

Targeted Deletion Mode (keep_since specified):

• Identifies build logs older than the specified date

• Extracts store paths from old logs using rxp_inspect()

• Protects recent store paths by creating temporary GC roots

• Attempts to delete old store paths individually using nix-store --delete

• Deletes the corresponding build log .json files from _rixpress/

• Handles referenced paths gracefully (paths that cannot be deleted due to dependencies)

Concurrency Safety: The function uses a lock file mechanism to prevent multiple instances from running simultaneously, which could interfere with each other's GC root management.

Reference Handling: Some store paths may not be deletable because they are still referenced by:

• User or system profile generations

• Active Nix shell environments

• Result symlinks in project directories

• Other store paths that depend on them

These paths are reported but not considered errors.

Value

Invisibly returns a list with cleanup summary information:

• kept: Vector of build log filenames that were kept

• deleted: Vector of build log filenames targeted for deletion

• protected: Number of store paths protected via GC roots (date-based mode)

• deleted_count: Number of store paths successfully deleted

• failed_count: Number of store paths that failed to delete

• referenced_count: Number of store paths skipped due to references

• log_files_deleted: Number of build log files successfully deleted

• log_files_failed: Number of build log files that failed to delete

• dry_run_details: List of detailed information when dry_run = TRUE

See Also

rxp_list_logs, rxp_inspect

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_read(), rxp_trace()

Examples

## Not run: 
# Preview what would be deleted (dry run)
rxp_gc(keep_since = "2025-08-01", dry_run = TRUE, verbose = TRUE)

# Delete artifacts from builds older than August 1st, 2025
rxp_gc(keep_since = "2025-08-01")

# Full garbage collection of all unreferenced store paths
rxp_gc()

# Clean up artifacts older than 30 days ago
rxp_gc(keep_since = Sys.Date() - 30)

## End(Not run)

Create a Directed Acyclic Graph (DAG) representing the pipeline using {ggplot2}

Description

Uses {ggdag} to generate the plot. {ggdag} is a soft dependency of {rixpress} so you need to install it to use this function.

Usage

rxp_ggdag(nodes_and_edges = get_nodes_edges())

Arguments

Value

A {ggplot2} object.

See Also

Other visualisation functions: rxp_visnetwork()

Examples

## Not run: 
  rxp_ggdag()

## End(Not run)

Import Nix store paths from an archive

Description

Imports the store paths contained in an archive file into the local Nix store. Useful for transferring built outputs between machines.

Usage

rxp_import_artifacts(archive_file = "_rixpress/pipeline_outputs.nar")

Arguments

Value

Nothing, imports the archive contents into the local Nix store.

See Also

Other archive caching functions: rxp_export_artifacts()

Examples

## Not run: 
  # Import from the default archive location
  rxp_import_artifacts()

  # Import from a custom archive file
  rxp_import_artifacts("path/to/my_archive.nar")

## End(Not run)

Initialize rixpress project

Description

Generates gen-env.R and gen-pipeline.R scripts in the specified project directory, after asking the user for confirmation. If the user declines, no changes are made.

Usage

rxp_init(project_path = ".", skip_prompt = FALSE)

Arguments

Details

Creates (overwriting if they already exist):

• gen-env.R: Script to define an execution environment with {rix}.

• gen-pipeline.R: Defines a data pipeline with {rixpress}.

Value

Logical. Returns TRUE if initialization was successful, FALSE if the operation was cancelled by the user.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_read(), rxp_trace()

Examples

# Default usage (will prompt before any action)
## Not run: 
  rxp_init()

## End(Not run)

Inspect the build result of a pipeline.

Description

Returns a data frame with four columns: - derivation: the name of the derivation - build_success: whether the build was successful or not - path: the path of this derivation in the Nix store - output: the output, if this derivation was built successfully. Empty outputs mean that this derivation was not built successfully. Several outputs for a single derivation are possible. In the derivation column you will find an object called all-derivations. This object is generated automatically for internal purposes, and you can safely ignore it.

Usage

rxp_inspect(project_path = ".", which_log = NULL)

Arguments

Value

A data frame with derivation names, if their build was successful, their paths in the /nix/store, and their build outputs.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_init(), rxp_list_logs(), rxp_load(), rxp_read(), rxp_trace()

Examples

## Not run: 
  # Inspect the most recent build
  build_results <- rxp_inspect()

  # Inspect a specific build log
  build_results <- rxp_inspect(which_log = "20250510")

  # Check which derivations failed
  failed <- subset(build_results, !build_success)

## End(Not run)

Create a Nix expression running a Julia function

Description

Create a Nix expression running a Julia function

Usage

rxp_jl(
  name,
  expr,
  additional_files = "",
  user_functions = "",
  nix_env = "default.nix",
  encoder = NULL,
  decoder = NULL,
  env_var = NULL,
  noop_build = FALSE
)

Arguments

Details

At a basic level, rxp_jl(filtered_data, "filter(df, :col .> 10)") is equivalent to ⁠filtered_data = filter(df, :col .> 10)⁠ in Julia. rxp_jl() generates the required Nix boilerplate to output a so‐called "derivation" in Nix jargon. A Nix derivation is a recipe that defines how to create an output (in this case filtered_data) including its dependencies, build steps, and output paths.

Value

An object of class derivation which inherits from lists.

See Also

Other derivations: rxp_jl_file(), rxp_py(), rxp_py_file(), rxp_qmd(), rxp_r(), rxp_r_file(), rxp_rmd()

Examples

## Not run: 
# Basic usage, no custom serializer
rxp_jl(
  name = filtered_df,
  expr = "filter(df, :col .> 10)"
)

# Skip building this derivation
rxp_jl(
  name = model_result,
  expr = "train_model(data)",
  noop_build = TRUE
)

# Custom serialization: assume `save_my_obj(obj, path)` is defined in functions.jl
rxp_jl(
  name = model_output,
  expr = "train_model(data)",
  encoder = "save_my_obj",
  user_functions = "functions.jl"
)

## End(Not run)

Creates a Nix expression that reads in a file (or folder of data) using Julia.

Description

Creates a Nix expression that reads in a file (or folder of data) using Julia.

Usage

rxp_jl_file(...)

Arguments

Details

The basic usage is to provide a path to a file, and the function to read it. For example: rxp_r_file(mtcars, path = "data/mtcars.csv", read_function = read.csv). It is also possible instead to point to a folder that contains many files that should all be read at once, for example: ⁠rxp_r_file(many_csvs, path = "data", read_function = \(x)(readr::read_csv(list.files(x, full.names = TRUE, pattern = ".csv$"))))⁠. See the vignette("importing-data") vignette for more detailed examples.

Value

An object of class rxp_derivation.

See Also

Other derivations: rxp_jl(), rxp_py(), rxp_py_file(), rxp_qmd(), rxp_r(), rxp_r_file(), rxp_rmd()

List all available build logs

Description

Returns a data frame with information about all build logs in the project's _rixpress directory.

Usage

rxp_list_logs(project_path = ".")

Arguments

Value

A data frame with log filenames, modification times, and file sizes.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_load(), rxp_read(), rxp_trace()

Examples

## Not run: 
  # List all build logs in the current project
  logs <- rxp_list_logs()

  # List logs from a specific project directory
  logs <- rxp_list_logs("path/to/project")

## End(Not run)

Load output of a derivation

Description

Loads the output of derivations in the parent frame of the current session, returns a path if reading directly is not possible.

Usage

rxp_load(derivation_name, which_log = NULL, project_path = ".")

Arguments

Details

When derivation_name points to a single R object, it gets loaded in the current session using assign(..., envir = parent.frame()), which corresponds to the global environment in a regular interactive session. If you're trying to load a Python object and {reticulate} is available, reticulate::py_load_object() is used and then the object gets loaded into the global environment. In case the derivation is pointing to several outputs (which can happen when building a Quarto document for example) or loading fails, the path to the object is returned instead.

Value

Nothing, this function has the side effect of loading objects into the parent frame.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_read(), rxp_trace()

Examples

## Not run: 
  # Load an R object
  rxp_load("mtcars")

  # Load a Python object
  rxp_load("my_python_model")

  # Load from a specific build log
  rxp_load("mtcars", which_log = "2025-05-10")

## End(Not run)

Build pipeline using Nix

Description

Runs nix-build with a quiet flag, outputting to ⁠_rixpress/result⁠.

Usage

rxp_make(verbose = 0L, max_jobs = 1, cores = 1)

Arguments

Value

A character vector of paths to the built outputs.

See Also

Other pipeline functions: rxp_populate()

Examples

## Not run: 
  # Build the pipeline with progress indicators (default)
  rxp_make()

  # Build with verbose output and parallel execution
  rxp_make(verbose = 2, max_jobs = 4, cores = 2)

  # Maximum verbosity
  rxp_make(verbose = 3)

## End(Not run)

Generate Nix Pipeline Code

Description

Generate Nix Pipeline Code

Usage

rxp_populate(derivs, project_path = ".", build = FALSE, py_imports = NULL, ...)

Arguments

Details

This function generates a pipeline.nix file based on a list of derivation objects. Each derivation defines a build step, and rxp_populate() chains these steps and handles the serialization and conversion of Python objects into R objects (or vice-versa). Derivations are created with rxp_r(), rxp_py() and so on. By default, the pipeline is also immediately built after being generated, but the build process can be postponed by setting build to FALSE. In this case, the pipeline can then be built using rxp_make() at a later stage. The generated pipeline.nix expression includes:

• the required imports of environments, typically default.nix files generated by the rix package;

• correct handling of interdependencies of the different derivations;

• serialization and deserialization of both R and Python objects, and conversion between them when objects are passed from one language to another;

• correct loading of R and Python packages, or extra functions needed to build specific targets

The ⁠_rixpress⁠ folder contains:

• R, Python or Julia scripts to load the required packages that need to be available to the pipeline.

• a JSON file with the DAG of the pipeline, used for visualisation, and to allow rxp_populate() to generate the right dependencies between derivations.

• .rds files with build logs, required for rxp_inspect() and rxp_gc(). See vignette("debugging") for more details.

Inline Python import adjustments In some cases, due to the automatic handling of Python packages, users might want to change import statements. By default if, say, pandas is needed to build a derivation, it will be imported with ⁠import pandas⁠. However, Python programmers typically use ⁠import pandas as pd⁠. You can either:

• use py_imports to rewrite these automatically during population, or

• use adjust_import() and add_import() for advanced/manual control. See vignette("polyglot") for more details.

Value

Nothing, writes a file called pipeline.nix with the Nix code to build the pipeline, as well as folder called _rixpress with required internal files.

See Also

Other pipeline functions: rxp_make()

Examples

## Not run: 
# Create derivation objects
d1 <- rxp_r(mtcars_am, filter(mtcars, am == 1))
d2 <- rxp_r(mtcars_head, head(mtcars_am))
list_derivs <- list(d1, d2)

# Generate and build in one go
rxp_populate(derivs = list_derivs, project_path = ".", build = TRUE)

# Or only populate, with inline Python import adjustments
rxp_populate(
  derivs = list_derivs,
  project_path = ".",
  build = FALSE,
  py_imports = c(pandas = "import pandas as pd")
)
# Then later:
rxp_make()

## End(Not run)

Create a Nix expression running a Python function

Description

Create a Nix expression running a Python function

Usage

rxp_py(
  name,
  expr,
  additional_files = "",
  user_functions = "",
  nix_env = "default.nix",
  encoder = NULL,
  decoder = NULL,
  env_var = NULL,
  noop_build = FALSE
)

Arguments

Details

At a basic level, rxp_py(mtcars_am, "mtcars.filter(polars.col('am') == 1).to_pandas()") is equivalent to ⁠mtcars_am = mtcars.filter(polars.col('am') == 1).to_pandas()⁠. rxp_py() generates the required Nix boilerplate to output a so-called "derivation" in Nix jargon. A Nix derivation is a recipe that defines how to create an output (in this case mtcars_am) including its dependencies, build steps, and output paths.

Value

An object of class derivation which inherits from lists.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py_file(), rxp_qmd(), rxp_r(), rxp_r_file(), rxp_rmd()

Examples

## Not run: 
  rxp_py(
    mtcars_pl_am,
    expr = "mtcars_pl.filter(polars.col('am') == 1).to_pandas()"
  )

  # Skip building this derivation
  rxp_py(
    data_prep,
    expr = "preprocess_data(raw_data)",
    noop_build = TRUE
  )

  # Custom serialization
  rxp_py(
    mtcars_pl_am,
    expr = "mtcars_pl.filter(polars.col('am') == 1).to_pandas()",
    user_functions = "functions.py",
    encoder = "serialize_model",
    additional_files = "some_required_file.bin")

## End(Not run)

Transfer Python object into an R session.

Description

Transfer Python object into an R session.

Usage

rxp_py2r(name, expr, nix_env = "default.nix")

Arguments

Details

rxp_py2r(my_obj, my_python_object) loads a serialized Python object and saves it as an RDS file using reticulate::py_load_object().

Value

An object of class rxp_derivation.

See Also

Other interop functions: rxp_r2py()

Creates a Nix expression that reads in a file (or folder of data) using Python.

Description

Creates a Nix expression that reads in a file (or folder of data) using Python.

Usage

rxp_py_file(...)

Arguments

Details

The basic usage is to provide a path to a file, and the function to read it. For example: rxp_r_file(mtcars, path = "data/mtcars.csv", read_function = read.csv). It is also possible instead to point to a folder that contains many files that should all be read at once, for example: ⁠rxp_r_file(many_csvs, path = "data", read_function = \(x)(readr::read_csv(list.files(x, full.names = TRUE, pattern = ".csv$"))))⁠ See the vignette("importing-data") vignette for more detailed examples.

Value

An object of class rxp_derivation.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py(), rxp_qmd(), rxp_r(), rxp_r_file(), rxp_rmd()

Render a Quarto document as a Nix derivation

Description

Render a Quarto document as a Nix derivation

Usage

rxp_qmd(
  name,
  qmd_file,
  additional_files = "",
  nix_env = "default.nix",
  args = "",
  env_var = NULL,
  noop_build = FALSE
)

Arguments

Details

To include built derivations in the document, rxp_read("derivation_name") should be put in the .qmd file.

Value

An object of class derivation which inherits from lists.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py(), rxp_py_file(), rxp_r(), rxp_r_file(), rxp_rmd()

Examples

## Not run: 
  # Compile a .qmd file to a pdf using typst
  # `images` is a folder containing images to include in the Quarto doc
  rxp_qmd(
    name = report,
    qmd_file = "report.qmd",
    additional_files = "images",
    args = "--to typst"
  )

  # Skip building this derivation
  rxp_qmd(
    name = draft_report,
    qmd_file = "draft.qmd",
    noop_build = TRUE
  )

## End(Not run)

Create a Nix expression running an R function

Description

Create a Nix expression running an R function

Usage

rxp_r(
  name,
  expr,
  additional_files = "",
  user_functions = "",
  nix_env = "default.nix",
  encoder = NULL,
  decoder = NULL,
  env_var = NULL,
  noop_build = FALSE
)

Arguments

Details

At a basic level, rxp_r(mtcars_am, filter(mtcars, am == 1)) is equivalent to mtcars_am <- filter(mtcars, am == 1). rxp_r() generates the required Nix boilerplate to output a so-called "derivation" in Nix jargon. A Nix derivation is a recipe that defines how to create an output (in this case mtcars_am) including its dependencies, build steps, and output paths.

Value

An object of class derivation which inherits from lists.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py(), rxp_py_file(), rxp_qmd(), rxp_r_file(), rxp_rmd()

Examples

## Not run: 
  # Basic usage
  rxp_r(name = filtered_mtcars, expr = filter(mtcars, am == 1))

  # Skip building this derivation
  rxp_r(
    name = turtles,
    expr = occurrence(species, geometry = atlantic),
    noop_build = TRUE
  )

  # Serialize object using qs
  rxp_r(
   name = filtered_mtcars,
   expr = filter(mtcars, am == 1),
   encoder = qs::qsave
  )
  # Unerialize using qs::qread in the next derivation
  rxp_r(
   name = mtcars_mpg,
   expr = select(filtered_mtcars, mpg),
   decoder = qs::qread
  )

## End(Not run)

Transfer R object into a Python session.

Description

Transfer R object into a Python session.

Usage

rxp_r2py(name, expr, nix_env = "default.nix")

Arguments

Details

rxp_r2py(my_obj, my_r_object) saves an R object to a Python pickle using reticulate::py_save_object().

Value

An object of class rxp_derivation.

See Also

Other interop functions: rxp_py2r()

Creates a Nix expression that reads in a file (or folder of data) using R.

Description

Creates a Nix expression that reads in a file (or folder of data) using R.

Usage

rxp_r_file(...)

Arguments

Details

The basic usage is to provide a path to a file, and the function to read it. For example: rxp_r_file(mtcars, path = "data/mtcars.csv", read_function = read.csv). It is also possible instead to point to a folder that contains many files that should all be read at once, for example: ⁠rxp_r_file(many_csvs, path = "data", read_function = \(x)(readr::read_csv(list.files(x, full.names = TRUE, pattern = ".csv$"))))⁠. See the vignette("importing-data") vignette for more detailed examples.

Value

An object of class rxp_derivation.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py(), rxp_py_file(), rxp_qmd(), rxp_r(), rxp_rmd()

Read output of a derivation

Description

Reads the output of derivations in the current session, returns a path if reading directly is not possible.

Usage

rxp_read(derivation_name, which_log = NULL, project_path = ".")

Arguments

Details

When derivation_name points to a single R object, it gets read in the current session using readRDS(). If it's a Python object and {reticulate} is available, reticulate::py_load_object() is used. In case the derivation is pointing to several outputs (which can happen when building a Quarto document for example) or neither readRDS() nor reticulate::py_load_object() successfully read the object, the path to the object is returned instead.

Value

The derivation's output.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_trace()

Examples

## Not run: 
  mtcars <- rxp_read("mtcars")

  # Read from a specific build log
  mtcars <- rxp_read("mtcars", which_log = "2025-05-10")

## End(Not run)

Render an R Markdown document as a Nix derivation

Description

Render an R Markdown document as a Nix derivation

Usage

rxp_rmd(
  name,
  rmd_file,
  additional_files = "",
  nix_env = "default.nix",
  params = NULL,
  env_var = NULL,
  noop_build = FALSE
)

Arguments

Details

To include objects built in the pipeline, rxp_read("derivation_name") should be put in the .Rmd file.

Value

An object of class derivation which inherits from lists.

See Also

Other derivations: rxp_jl(), rxp_jl_file(), rxp_py(), rxp_py_file(), rxp_qmd(), rxp_r(), rxp_r_file()

Examples

## Not run: 
  # Compile a .Rmd file to a pdf
  # `images` is a folder containing images to include in the R Markdown doc
  rxp_rmd(
    name = report,
    rmd_file = "report.Rmd",
    additional_files = "images"
  )

  # Skip building this derivation
  rxp_rmd(
    name = draft_report,
    rmd_file = "draft.Rmd",
    noop_build = TRUE
  )

## End(Not run)

Trace lineage of derivations

Description

Trace lineage of derivations

Usage

rxp_trace(
  name = NULL,
  dag_file = file.path("_rixpress", "dag.json"),
  transitive = TRUE,
  include_self = FALSE
)

Arguments

Value

Invisibly, a named list mapping each inspected derivation name to a list with elements: - dependencies - reverse_dependencies The function also prints a tree representation to the console.

See Also

Other utilities: print.rxp_derivation(), rxp_copy(), rxp_gc(), rxp_init(), rxp_inspect(), rxp_list_logs(), rxp_load(), rxp_read()

Create a Directed Acyclic Graph (DAG) representing the pipeline using {visNetwork}

Description

Uses {visNetwork} to generate the plot. {visNetwork} is a soft dependency of {rixpress} so you need to install it to use this function.

Usage

rxp_visnetwork(nodes_and_edges = get_nodes_edges())

Arguments

Value

Nothing, this function opens a new tab in your browser with the DAG generated using {visNetwork}.

See Also

Other visualisation functions: rxp_ggdag()

Examples

## Not run: 
  rxp_visnetwork()

## End(Not run)

Generate a DAG from a list of derivations

Description

Creates a JSON representation of a directed acyclic graph (DAG) based on dependencies between derivations. Is automatically called by rxp_populate().

Usage

rxp_write_dag(rxp_list, output_file = "_rixpress/dag.json")

Arguments

Value

Nothing, writes a JSON file representing the DAG.

See Also

Other ci utilities: rxp_dag_for_ci(), rxp_ga()

Examples

## Not run: 
  rxp_write_dag(rxp_list)

## End(Not run)

Sanitize nix environment string

Description

Produces a base identifier string by replacing invalid characters and stripping suffixes.

Usage

sanitize_nix_env(nix_env)

Arguments

Value

Sanitized base string.