NEWS.md

targets 0.12.1.9000

Bug fixes

• Do not bootstrap the junction of a stem unless the target is branched over (#858, @dipterix).

New features

• Allow extra arguments to paws functions via ... in tar_resources_aws() (#855, @michkam89).

Enhancements

• Color ordinary targets messages the default theme color, and color warnings and errors red (#856, @gorkang).

targets 0.12.1

New features

• Add arguments legend and color to further configure tar_mermaid() (#848, @noamross).
• For HPC schedulers like SLURM and SGE, use_targets() now creates a job.sh script to run the pipeline as a cluster job (#839).

Enhancements

• Use lapply() to source scripts in use_targets(). Avoids defining a global variable for the file.
• Recursively find scripts to source in the use_targets() _targets.R file.
• Refactor error printing.

targets 0.12.0

Bug fixes

• Fix tar_mermaid() graph ordering.
• Hash the node names and quote the label names of tar_mermaid() graphs to avoid JavaScript keywords.
• Remove superfluous line breaks in the node labels of graph visuals.
• Fix metadata migration to version >= 0.10.0 (#812, @tjmahr).
• data.table::fread() with encoding equal to getOption("encoding") if available (#814, @svraka). Only works with UTF-8 and latin1 because that is what data.table supports.
• Force add files in GitHub Actions workflow job (#815, @tarensanders).

New features

• use_targets() now writes a _targets.R file tailored to the project in the current working directory (#639, @noamross).
• Move the old use_targets() to use_targets_rmd().

Enhancements

• Load packages when loading data for downstream targets in the pipeline (#713).
• Handle edge case when getOption("OutDec") is not "." to prevent time stamps from being corrupted (#433, @jarauh).
• Added helper function tar_load_everything() to quickly load all targets (#823, @malcolmbarrett)

targets 0.11.0

Bug fixes

• Print out the relevant target names if targets have conflicting names.
• Catch all the target warnings instead of just reporting the last one.
• Allow 200 group URL status codes instead of just 200 (#797, @petrbouchal).

New features

• Add Google Cloud Storage via tar_target(..., repository = "gcp") (#720, @markedmondson1234). Special thanks to @markedmondson1234 for the cloud storage utilities in R/utils_gcp.R
• mermaid.js static graphs with tar_mermaid() (#775, @yonicd).
• Implement tar_target(..., error = "null")to allow errored targets to return NULL and continue (#807, @zoews). Errors are still registered, those targets are not up to date, and downstream targets have an easier time continuing on.
• Implement tar_assert_finite().
• tar_destroy(), tar_delete(), and tar_prune() now attempt to delete cloud data for the appropriate targets (#799). In addition, tar_exist_objects() and tar_objects() now report about target data in the cloud when applicable. Add a new cloud argument to each function to optionally suppress this new behavior.
• Add a zoom_speed argument to tar_visnetwork() and tar_glimpse() (#749, @dipterix).
• Report the total runtime of the pipeline in the "verbose", "verbose_positives", "timestamp", and "timesamp_positives" reporters.

Enhancements

• Allow target name character strings to have attributes (#758, @psanker).
• Sort metadata rows when the pipeline finishes so that version-controlling the metadata is easier (#766, @jameelalsalam).

Deprecations

• Deprecate the "aws_*" storage format values in favor of a new repository argument (#803). In other words, tar_target(..., format = "aws_qs") is now tar_target(..., format = "qs", repository = "aws"). And internally, storage classes with multiple inheritance are created dynamically as opposed to having hard-coded source files. All this paves the way to add new cloud storage platforms without combinatorial chaos.

targets 0.10.0

Bug fixes

• Add class "tar_nonexportable" to format = "aws_keras" and format = "aws_torch" stores.
• Export S3 methods of generic tar_make_interactive_load_target().

New features

• Allow entirely custom storage formats through tar_target(format = tar_format(...)) (#736).
• Add a new function tar_call() to return the targets function currently running (from _targets.R or a target).
• Add a new function tar_active() to tell whether the pipeline is currently running. Detects if it is called from tar_make() or similar function.

Enhancements

• Add Sys.getenv("TAR_PROJECT") to the output of tar_envvars().
• Set the store field of tar_runtime prior to sourcing _targets.R so tar_store() works in target scripts.
• Explicitly export all the environment variables from tar_envvars() to targets run on parallel workers.
• Allow format = "file" targets to return character(0) (#728, @programLyrique).
• Automatically remove non-targets from the target list and improve target list error messages (#731, @billdenney).
• Link to resources on deploying to RStudio Connect (#745, @ian-flores).

targets 0.9.1

• Mask pointers in function dependencies (#721, @matthiaskaeding)

targets 0.9.0

Highlights

• Track the version ID of AWS S3-backed targets if the bucket is version-enabled (#711). If you put your targets in AWS and the metadata and code under version control, you can git checkout a different branch of your code and all you targets will stay up to date.
• Refactor the AWS path format internally. It now consists of arbitrarily extensible key-value pairs so more AWS S3 functionality may be added more seamlessly going forward (#711).
• Switch the AWS S3 backend to paws (#711).

New features

• Add a region argument to tar_resources_aws() to allow the user to explicitly declare a region for each AWS S3 buckets (@caewok, #681). Different buckets can now have different regions. This feature required modifying the metadata path for AWS storage formats. Before, the first element of the path was simply the bucket name. Now, it is internally formatted like "bucket=BUCKET:region=REGION", where BUCKET is the user-supplied bucket name and REGION is the user-supplied region name. The new targets is back-compatible with the old metadata format, but if you run the pipeline with targets >= 0.8.1.9000 and then downgrade to targets <= 0.8.1, any AWS targets will break.
• Add new reporters timestamp_positives" and "verbose_positives" that omit messages for skipped targets (@psanker, #683).
• Implement tar_assert_file().
• Implement tar_reprex() for creating easier reproducible examples of pipelines.
• Implement tar_store() to get the path to the store of the currently running pipeline (#714, @MilesMcBain).
• Automatically write a _targets/user/ folder to encourage gittargets users to put custom files there for data version control.

Bug fixes

• Make sure tar_path() uses the current store path of the currently running pipeline instead of tar_config_get("store") (#714, @MilesMcBain).

Enhancements

• Refactor the automatic .gitignore file inside the data store to allow the metadata to be committed to version control more easily (#685, #711).
• Document target name requirements in tar_target() and tar_target_raw() (@tjmahr, #679).
• Catch and relay any the error if a target cannot be checked in target_should_run.tar_builder(). These kinds of errors sometimes come up with AWS storage.
• Fix the documentation of the reporters.
• Only write _targets/.gitignore for new data stores so the user can delete the .gitignore file without it mysteriously reappearing (#685).

targets 0.8.1

New features

• Add arguments strict and silent to allow tar_load() and tar_load_raw() to bypass targets that cannot be loaded.

Enhancements

• Improve tidyselect docs in tar_make() (#640, @dewoller).
• Use namespaced call to tar_dir() in tar_test() (#642, @billdenney).
• Improve tar_assert_target_list() error message (@kkami1115, #654).
• Throw an informative error if a target name starts with a dot (@dipterix, #662).
• Improve help files of tar_destroy() and related cleanup functions (@billdenney, #675).

targets 0.8.0

Bug fixes

• Hash the correct files in tar_target(target_name, ..., format = "aws_file"). Previously, _targets/objects/target_name was also hashed if it existed.

New features

• Implement a new tar_config_unset() function to delete one or more configuration settings from the YAML configuration file.
• Implement the TAR_CONFIG environment variable to set the default file path of the YAML configuration file with project settings (#622, @yyzeng, @atusy, @nsheff, @wdkrnls). If TAR_CONFIG is not set, the file path is still _targets.yaml.
• Restructure the YAML configuration file format to handle configuration information for multiple projects (using the config package) and support the TAR_PROJECT environment variable to select the current active project for a given R session. The old single-project format is gracefully deprecated (#622, @yyzeng, @atusy, @nsheff, @wdkrnls).
• Implement retrieval = "none" and storage = "none" to anticipate loading/saving targets from other languages, e.g. Julia (@MilesMcBain).
• Add a new tar_definition() function to get the target definition object of the current target while that target is running in a pipeline.
• If called inside an AWS target, tar_path() now returns the path to the staging file instead of _targets/objects/target_name. This ensures you can still write to tar_path() in storage = "none" targets and the package will automatically hash the right file and upload it to the cloud. (This behavior does not apply to formats "file" and "aws_file", where it is never necessary to set storage = "none".)

Enhancements

• Use eval(parse(text = ...), envir = tar_option_set("envir") instead of source() in the _targets.R file for Target Markdown.
• Allow feather and parquet formats to accept objects of class RecordBatch and Table (@MilesMcBain).
• Let knitr load the Target Markdown engine (#469, @nviets, @yihui). Minimum knitr version is now 1.34.
• In the tar_resources_future() help file, encourage the use of plan to specify resources.

targets 0.7.0

Bug fixes

• Ensure error = "continue" does not cause errored targets to have NULL values.
• Relay output and messages in Target Markdown interactive mode (using the R/default knitr engine).

New features

• Expose the poll_connection, stdout, and stderr arguments of callr::r_bg() in tar_watch() (@mpadge).
• Add new helper functions to list targets in each progress category: tar_started(), tar_skipped(), tar_built(), tar_canceled(), and tar_errored().
• Add new helper functions tar_interactive(), tar_noninteractive(), and tar_toggle() to differentially suppress code in non-interactive and interactive mode in Target Markdown (#607, @33Vito).

Enhancements

• Handle future errors within targets (#570, @stuvet).
• Handle storage errors within targets (#571, @stuvet).
• In Target Markdown in non-interactive mode, suppress messages if the message knitr chunk option is FALSE (#574, @jmbuhr).
• In Target Markdown, if tar_interactive is not set, choose interactive vs non-interactive mode based on isTRUE(getOption("knitr.in.progress")) instead of interactive().
• Convert errors loading dependencies into errors running targets (@stuvet).

targets 0.6.0

Bug fixes

• Allow tar_poll() to lose and then regain connection to the progress file.
• Make sure changes to the tar_group column of iteration = "group" data frames do not invalidate slices (#507, @lindsayplatt).

New features

• In Target Markdown, add a new tar_interactive global option to select interactive mode or non-interactive mode (#469).
• Highlight a graph neighborhood when the user clicks a node. Control the neighborhood degree with new arguments degree_from and degree_to of tar_visnetwork() and tar_glimpse() (#474, @rgayler).
• Make the target script path configurable in tar_config_set() (#476).
• Add a tar_script chunk option in Target Markdown to control where the {targets} language engine writes the target script and helper scripts (#478).
• Add new arguments script and store to choose custom paths to the target script file and data store for individual function calls (#477).
• Allow users to set an alternative path to the YAML configuration file for the current R session (#477). Most users have no reason to set this path, it is only for niche applications like Shiny apps with targets backends. Unavoidably, the path gets reset to _targets.yaml when the session restarts.
• Add new _targets.yaml config options reporter_make, reporter_outdated, and workers to control function argument defaults shared across multiple functions called outside _targets.R (#498, @ianeveperry).
• Add tar_load_globals() for debugging, testing, prototyping, and teaching (#496, @malcolmbarrett).
• Add structure to the resources argument of tar_target() to avoid conflicts among formats and HPC backends (#489). Includes user-side helper functions like tar_resources() and tar_resources_aws() to build the required data structures.
• Log skipped targets in _targets/meta/progress and display then in tar_progress(), tar_poll(), tar_watch(), tar_progress_branches(), tar_progress_summary(), and tar_visnetwork() (#514). Instead of writing each skip line separately to _targets/meta/progress, accumulate skip lines in a queue and then write them all out in bulk when something interesting happens. This avoids a lot of overhead in certain cases.
• Add a shortcut argument to tar_make(), tar_make_clustermq(), tar_make_future(), tar_outdated(), and tar_sitrep() to more efficiently skip parts of the pipeline (#522, #523, @jennysjaarda, @MilesMcBain, @kendonB).
• Support names and shortcut in graph data frames and graph visuals (#529).
• Move allow and exclude to the network behind the graph visuals rather than the visuals themselves (#529).
• Add a new "progress" display to the tar_watch() app to show verbose progress info and metadata.
• Add a new workspace_on_error argument of tar_option_set() to supersede error = "workspace". Helps control workspace behavior independently of the error argument of tar_target() (#405, #533, #534, @mattwarkentin, @xinstein).
• Implement error = "abridge" in tar_target() and related functions. If a target errors out with this option, the target itself stops, any currently running targets keeps, and no new targets launch after that (#533, #534, @xinstein).
• Add a menu prompt to tar_destroy() which can be suppressed with TAR_ASK = "false" (#542, @gofford).
• Support functions tar_older() and tar_newer() to help users identify and invalidate targets at regular times or intervals.

Deprecations

• In Target Markdown, deprecate the targets chunk option in favor of tar_globals (#469).
• Deprecate error = "workspace" in tar_target() and related functions. Use tar_option_set(workspace_on_error = TRUE) instead (#405, #533, @mattwarkentin, @xinstein).

Performance

• Reset the backoff upper bound when concluding a target or shutting down a clustermq worker (@rich-payne).
• Set more aggressive default backoff bound of 0.1 seconds (previous: 5 seconds) and set a more aggressive minimum of 0.001 seconds (previous: 0.01 seconds) (@rich-payne).
• Speed up the summary and forecast reporters by only printing to the console every quarter second.
• Avoid superfluous calls to store_sync_file_meta.default() on small files.
• In tar_watch(), take several measures to avoid long computation times rendering the graph:
  • Expose arguments display and displays to tar_watch() so the user can select which display shows first.
  • Make "summary" the default display instead of "graph".
  • Set outdated to FALSE by default.

Enhancements

• Simplify the Target Markdown example.
• Warn about unnamed chunks in Target Markdown.
• Redesign option system to be more object-oriented and rigorous. Also export most options to HPC workers (#475).
• Simplify config system to let API function arguments take control (#483).
• In tar_read() for targets with format = "aws_file", download the file back to the path the user originally saved it when the target ran.
• Replace the TAR_MAKE_REPORTER environment variable with targets::tar_config_get("reporter_make").
• Use eval(parse(text = readLines("_targets.R")), envir = some_envir) and related techniques instead of the less controllable source(). Expose an envir argument to many functions for further control over evaluation if callr_function is NULL.
• Drop out.attrs when hashing groups of data frames to extend #507 to expand.grid() (#508).
• Increase the number of characters in errors and warnings up to 2048.
• Refactor assertions to automatically generate better messages.
• Export assertions, conditions, and language utilities in packages that build on top of targets.
• Change GITHUBPAT to GITHUB_TOKEN in the tar_github_actions() YAML file (#554, @eveyp).
• Support the eval chunk option in Target Markdown (#552, @fkohrt).
• Record time stamps in the metadata time column for all builder targets, regardless of storage format.

targets 0.5.0

Bug fixes

• Export in-memory config settings from _targets.yaml to parallel workers.

New features

• Add a limited-scope exclude argument to tar_watch() and tar_watch_server() (#458, @gorkang).
• Write a .gitignore file to ignore everything in _targets/meta/ except .gitignore and _targets/meta/meta.
• Target Markdown: add knitr engines for pipeline construction and prototyping from within literate programming documents (#469, @cderv, @nviets, @emilyriederer, @ijlyttle, @GShotwell, @gadenbuie, @tomsing1). Huge thanks to @cderv on this one for answering my deluge of questions, helping me figure out what was and was not possible in knitr, and ultimately circling me back to a successful approach.
• Add an RStudio R Markdown template for Target Markdown (#469).
• Implement use_targets(), which writes the Target Markdown template to the project root (#469).
• Implement tar_unscript() to clean up scripts written by Target Markdown.

Enhancements

• Enable priorities in tar_make() and tar_manifest().
• Show the priority in the print method of stem and pattern targets.
• Throw informative errors if the secondary arguments to pattern = slice() or pattern = sample() are invalid.
• In tar_target_raw(), assert that commands have length 1 when converted to expressions.
• Handle errors and post failure artifacts in the Github Actions YAML file.
• Rewrite the documentation on invalidation rules in tar_cue() (@maelle).
• Drop dplyr groups and "grouped_df" class in tar_group() (tarchetypes discussion #53, @kendonB).
• Assign branch names to dynamic branching return values produced by tar_read() and tar_read_raw().

targets 0.4.2

Bug fixes

• Do not use time stamps to monitor the config file (e.g. _targets.yaml). Fixes CRAN check errors from version 0.4.1.

targets 0.4.1

• Fix CRAN test error on Windows R-devel.
• Do not inherit roxygen2 docstrings from shiny.
• Handle more missing Suggests: packages.
• Unset the config lock before reading targets.yaml in the callr process.

targets 0.4.0

Bug fixes

• Avoid file.rename() errors when migrating staged temporary files (#410).
• Return correct error messages from feather and parquet formats (#388). Now calling assert_df() from store_assert_format() instead of store_cast_object(). And now those last two functions are not called at all if the target throws an error.
• Retry writing lines to database files so Windows machines can run tar_poll() at the same time as the pipeline (#393).
• Rename file written by tar_renv() to _targets_packages.R (#397).
• Ensure metadata is loaded to compute labels properly when outdated = FALSE in tar_visnetwork().

New features

• Implement tar_timestamp() and tar_timestamp_raw() to get the last modified timestamp of a target's data (#378).
• Implement tar_progress_summary() to compactly summarize all pipeline progress (#380).
• Add a characters argument of tar_traceback() to cap the traceback line lengths (#383).
• Add new "summary" and "about" views to tar_watch() (#382).
• Implement tar_poll() to repeatedly poll runtime progress in the R console (#381). tar_poll() is a lightweight alternative to tar_watch().
• Change the color of the "dormant" status in the graph.
• Add a tar_envvar() function to list values of special environment variables supported in targets. The help file explains each environment variable in detail.
• Support extra project-level configuration settings with _targets.yaml (#297). New functions tar_config_get() and tar_config_set() interact with the _targets.yaml file. Currently only supports the store field to set the data store path to something other than _targets/.

Performance

• Shut down superfluous persistent workers earlier in dynamic branching and when all remaining targets have deployment = "main" (#398, #399, #404, @pat-s).

Enhancements

• Attempt to print only the useful part of the traceback in tar_traceback() (#383).
• Add a line break at the end of the "summary" reporter so warnings do not mangle the output.
• In tar_watch(), use shinybusy instead of shinycssloaders and keep current output on display while new output is rendering (#386, @rcorty).
• Right-align the headers and counts in the "summary" and "forecast" reporters.
• Add a timestamp to the "summary" reporter.
• Make the reporters show when a target ends (#391, @mattwarkentin).
• Make the reporters show when a pattern ends if the pattern built at least one target and none of the targets errored or canceled.
• Use words "start" and "built" in reporters.
• Use the region of the AWS S3 bucket instead of the local AWS_DEFAULT_REGION environment variable (check_region = TRUE; #400, @tomsing1).
• In tar_meta(), return POSIXct times in the time zone of the calling system (#131).
• Throw informative error messages when a target's name or command is missing (#413, @liutiming).
• Bring back ALTREP in qs::qread() now that qs 0.24.1 requires stringfish >= 1.5.0 (#147, @glep).
• Relax dynamic branching checks so pattern = slice(...) can take multiple indexes (#406, #419, @djbirke, @alexgphayes)

targets 0.3.1

Bug fixes

• queue$enqueue() is now queue$prepend() and always appends to the front of the queue (#371).

Enhancements

• Throw a warning if devtools::load_all() or similar is detected inside _targets.R (#374).

CRAN

• Skip feather and parquet tests on CRAN.

targets 0.3.0

Bug fixes

• Fix the "write target at cursor" RStudio addin and move cursor between the parentheses.

New features

• Add a backoff option in tar_option_set() to set the maximum upper bound (seconds) for the polling interval (#333).
• Add a new tar_github_actions() function to write a GitHub Actions workflow file for continuous deployment of data analysis pipelines (#339, @jaredlander).
• Add a new TAR_MAKE_REPORTER environment variable to globally set the reporter of the tar_make*() functions (#345, @alexpghayes).
• Support new storage formats "feather", "parquet", "aws_feather", and "aws_parquet" (#355, @riazarbi).

Performance

• Implement an exponential backoff algorithm for polling the priority queue in tar_make_clustermq() and tar_make_future() (#333).
• In tar_make_future(), try to submit a target every time a worker is polled.
• In tar_make_future(), poll workers in order of target priority.
• Avoid the time delay in exiting on error (from r-lib/callr#185).
• Clone target objects for the pipeline and scrape more targets internal objects out of the environment in order to avoid accidental massive data transfers to workers.

Enhancements

• Use rlang::check_installed() inside assert_package() (#331, @malcolmbarrett).
• Allow tar_destroy(destroy = "process").
• In tar_watch(), increase default seconds to 15 (previously 5).
• In tar_watch(), debounce instead of throttle inputs.
• In tar_watch(), add an action button to refresh the outputs.
• Always deduplicate metadata after tar_make(). Will help compute a cache key on GitHub Actions and similar services.
• Deprecate tar_deduplicate() due to the item above.
• Reorder information in timestamped messages.
• Document RNG seed generation in tar_target_raw(), tar_meta(), and tar_seed() (#357, @alexpghayes).
• Switch meaning of %||% and %|||% to conform to historical precedent.
• Only show a command line spinner if reporter = "silent" (#364, @matthiasgomolka).
• Target and pipeline objects no longer have an envir element.

targets 0.2.0

Bug fixes

• In tar_load(), subset metadata to avoid accidental attempts to load global objects in tidyselect calls.
• Do not register a pattern as running unless an actual branch is about to start (#304).
• Use a name spec in vctrs::vec_c() (#320, @joelnitta).

New features

• Add a new names argument to tar_objects() and tar_workspaces() with tidyselect functionality.
• Record info on the main process (PID, R version, targets version) in _targets/meta/process and write new functions tar_process() and tar_pid() to retrieve the data (#291, #292).
• Add a new targets_only argument to tar_meta().
• Add new functions tar_helper() and tar_helper_raw() to write general-purpose R scripts, using tidy evaluation for as a template mechanism (#290, #291, #292, #306).
• Export functions to check the existence of various pieces of local storage: tar_exist_meta(), tar_exist_objects(), tar_exist_progress(), tar_exist_progress(), tar_exist_script() (#310).
• Add a new supervise argument to tar_watch().
• Add a new complete_only argument to tar_meta() to optionally return only complete rows (no NA values).
• Catch callr errors and refer users to the debugging chapter of the manual.

Enhancements

• Improve error messages of invalid arguments (#298, @brunocarlin). Removes partial argument matching in most cases.
• By default, locally enable crayon if an only if the calling process is interactive (#302, @ginolhac). Can still be disabled with options(crayon.enabled = FALSE) in _targets.R.
• Improve error handling and message for format = "url" when the HTTP response status code is not 200 (#303, @petrbouchal).
• Add more extras packages to tar_renv() (to support tar_watch()).
• Show informative message instead of error in tar_watch() if _targets.R does not exist.
• Clear up the documentation of the names argument of tar_load() (#314, @jameelalsalam).
• Do not override nobody in custom curl handles (#315, @riazarbi).
• Rename "running" to "started" in the progress metadata. This avoids the implicit claim that targets is somehow actively monitoring each job, e.g. through a connection or heartbeat (#318).
• Set errormode = "warn" in getVDigest() for files to work around eddelbuettel/digest#49 for network drives on Windows. targets already runs those file checks anyway. (#316, @boshek).
• If a package fails to load, print the library paths targets tried to load from.

targets 0.1.0

Bug fixes

• tar_test() now skips all tests on Solaris in order to fix the problems shown on the CRAN check page.
• Enable allow and exclude to work on imports in tar_visnetwork() and tar_glimpse().
• Put visNetwork legends on right to avoid crowding the graph.

Performance

• Call force() on subpipeline objects to eliminate high-memory promises in target objects. Allows targets to be deployed to workers much faster when retreival is "main" (#279).

New features

• Add a new box to the tar_watch() app to tabulate progress on dynamic branches (#273, @mattwarkentin).
• Store type, parent, and branches in progress data for tar_watch() (#273, @mattwarkentin).
• Add a fields argument in tar_progress() and default to "progress" for back compatibility (#273, @mattwarkentin).
• Add a new tar_progress_branches() function to tabulate branch progress (#273, @mattwarkentin).
• Add new "refresh" switch to tar_watch() to toggle automatic refreshing and force a refresh.

Enhancements

• Exclude .Random.seed by default in tar_visnetwork().
• Spelling: "cancelled" changed to "canceled".
• Enhance controls and use of space in the tar_watch() app.
• Centralize internal path management utilities.

Configuration

• Skip clustermq tests on Solaris.

targets 0.0.2

CRAN response

• Avoid starting the description with the package name.
• Remove if(FALSE) blocks from help files to fix "unexecutable code" warnings (tar_glimpse(), tar_visnetwork(), and tar_watch()).
• Remove commented code in the examples (tar_edit(), tar_watch_ui(), and tar_watch_server()).
• Ensure that all examples, tests, and vignettes do not write to the user's home file space. (Fixed an example of tar_workspace().)

Enhancements

• Use JOSS paper in CITATION.

targets 0.0.1

Enhancements

• Accept lists of target objects at the end of _targets.R (#253).
• Deprecate tar_pipeline() and tar_bind() because of the above (#253).
• Always show a special message when the pipeline finishes (#258, @petrbouchal).
• Disable visNetwork stabilization (#264, @mattwarkentin).
• Use default visNetwork font size.
• Relay errors as condition messages if error is "continue" (#267, @liutiming).

targets 0.0.0.9003

Bug fixes

• Ensure pattern-only pipelines can be defined so they can be combined again later with tar_bind() (#245, @yonicd).
• Implement safeguards around igraph topological sort.

Enhancements

• Topologically sort the rows of tar_manifest() (#263, @sctyner).

Breaking changes

• Make patterns composable (#212, @glep, @djbirke).
• Allow workspaces to load nonexportable objects (#214).
• Make workspace files super light by saving only a reference to the required dependencies (#214).
• Add a new workspaces argument to tar_option_set() to specify which targets will save their workspace files during tar_make() (#214).
• Change error = "save" to error = "workspace" to so it is clearer that saving workspaces no longer duplicates data (#214).
• Rename what to destroy in tar_destroy().
• Remove tar_undebug() because is redundant with tar_destroy(destroy = "workspaces").

New features

• Make patterns composable (#212).
• Add new dynamic branching patterns head(), tail(), and sample() to provide functionality equivalent to drake's max_expand (#56).
• Add a new tar_pattern() function to emulate dynamic branching outside a pipeline.
• Add a new level_separation argument to tar_visnetwork() and tar_glimpse() to control the aspect ratio (#226).
• Track functions from multiple packages with the imports argument to tar_option_set() (#239).
• Add color for "built" progress if outdated is FALSE in tar_visnetwork().
• Tweak colors in tar_visnetwork() to try to account for color blindness.

Enhancements

• Return full patterns from tar_manifest().
• Record package load errors in progress and metadata (#228, @psychelzh).
• tar_renv() now invokes _targets.R through a background process just like tar_outdated() etc. so it can account for more hidden packages (#224, @mattwarkentin).
• Set deployment equal to "main" for all targets in tar_make(). This ensures tar_make() does not waste time waiting for nonexistent files to ship over a nonexistent network file system (NFS). tar_make_clustermq() or tar_make_future() could use NFS, so they still leave deployment alone.

targets 0.0.0.9002

Breaking changes

• Add a new size field to the metadata to allow targets to make better judgments about when to rehash files (#180). We now compare hashes to check file size differences instead of doing messy floating point comparisons with ad hoc tolerances. It breaks back compatibility with old projects, but the error message is informative, and this is all still before the first official release.
• Change "local" to "main" and "remote" to "worker" in the storage, retrieval, and deployment settings (#183, @mattwarkentin).
• Ensure function dependencies are sorted before computing the function hash (GitHub commit f15face7d72c15c2d1098da959492bdbfcddb425).
• Move garbage_collection to a target-level setting, i.e. argument to tar_target() and tar_option_set() (#194). Previously was an argument to the tar_make*() functions.
• Allow tar_name() and tar_path() to run outside the pipeline with debugging-friendly default return values.

Bug fixes

• Stop sending target return values over the network when storage is "remote" (#182, @mattwarkentin).
• Shorten lengths of warnings and error messages to 128 characters (#186, @gorkang).
• Restrict in-memory metadata to avoid incorrectly recycling deleted targets (#191).
• Marshal nonexportable dependencies before sending them to workers. Transport data through target$subpipeline rather than target$cache to make that happen (#209, @mattwarkentin).

New features

• Add a new function tar_bind() to combine pipeline objects.
• Add tar_seed() to get the random number generator seed of the target currently running.

Enhancements

• Allow target-specific future::plan()s through the resources argument of tar_target() (#198, @mattwarkentin).
• Use library() instead of require() in command_load_packages().
• Evaluate commands directly in targets$cache$targets$envir to improve convenience in interactive debugging (ls() just works now.) This is reasonably safe now that the cache is populated at the last minute and cleared as soon as possible (#209, #210).

targets 0.0.0.9000

• First version.