rmapshaper 0.5.0

This is a fairly major release with much of the internal plumbing changed. I have tried to keep user-facing changes to a minimum, but please report any issues to https://github.com/ateucher/rmapshaper/issues.

• Switched to using the geojsonsf package instead of geojsonio for object conversion (#118).
• Updated the bundled mapshaper version to v0.6.25 (#130).
• Dropped support for geojson_list objects. This was a rarely-used class from the geojsonio package (#118).
• Arguments force_FC, sys, and sys_mem are now passed to apply_mapshaper_commands via ... rather than explicitly, so they are now documented in the ... section of each function. This may break some existing code if you were passing values to these arguments by position rather than by name, especially using force_FC in ms_simplify as it was not at the end of the argument list. It may also change the class of the return value for some input classes and functions (such as ms_lines and ms_innerlines) as force_FC will inherit the default TRUE for all functions.
• Added quiet argument to silence mapshaper console messages when using sys = TRUE. This can be controlled globally with options("mapshaper.sys_quiet" = TRUE) (#125).
• Added ability to globally set the system memory when using the system mapshaper via options("mapshaper.sys_mem"=X), where X is the amount of memory in GB.

rmapshaper 0.4.6

• Fixed a long-standing issue where units columns in sf objects would cause failures; all numeric columns of class "units" are now converted to numeric before running through mapshaper commands. (#116, thanks @Robinlovelace)
• Added a default value for force_FC in apply_mapshaper_commands(). The default value is TRUE (#120, thanks @dblodgett-usgs)
• Documentation fix in check_sys_mapshaper() - fixed description of return value (#117, thanks @dblodgett-usgs).
• Included an example of setting memory allocation when using the system mapshaper in README (#114, thanks @baldeagle).

rmapshaper 0.4.5

• Fixed a bug where functions would fail when there was a space in user's tmpdir()
  path and sys = TRUE (#107)
• Updated bundled mapshaper library to v 0.4.163, which fixed a bug in ms_erase (#110, #104, #112)
• When sys = TRUE, now uses mapshaper-xl in the system call, allowing
  larger memory use. Default 8GB can be specified in new argument sys_mem (#94, #112)
• Internally switched to using system2() over system() for flexibility

CRAN version 0.4.4

rmapshaper 0.4.4

• Small fixes for compatability with sf >= 0.9

CRAN version 0.4.3

rmapshaper 0.4.3

• Add checks, a package startup message, and helpful errors for the case when
  a user has an old version of libv8 installed, as they do not support many
  aspects of modern JavaScript (ES6). This appears to only impact ms_erase()
  and ms_clip().
• Using apply_mapshaper_commands() no longer deletes a file when used on a local file (#99, #100)

CRAN version 0.4.2

rmapshaper 0.4.2

• Added rgdal to Suggests so ms_clip and ms_erase can transform
  Spatial* objects when they have different CRSs.
• When an input sf object is a tibble, the output is now now also a tibble,
  (#95, thanks @mdsumner)
• Upgraded to mapshaper v0.4.107
• Bumped minimum version of V8 to 3.0

CRAN version 0.4.1

rmapshaper 0.4.1

• Fixed a bug when using sys = TRUE would fail on Windows in some circumstances (#77)
• Fixed an issue where running rmapshaper functions on sfc objects failed with
  sf v0.7

CRAN version 0.4.0

New features

• Added sys argument to allow the use of the system mapshaper if it's installed (#61)

Improvements and bug fixes

• Upgraded to mapshaper v0.4.64 (#60)
• sf::st_read() is now used throughout for reading from disk and from geojson
  strings, which allows for greater consistency and better performance.
• Better handling of different column classes (#68, thanks @mdsumner)
• Avoid stackoverflow caused by adding special geojson classes (#71,
  ropensci/geojsonio#128)
• The name of the sf column is now properly retained (#70)
• Fixed issue where encoding/special characters were not preserved (#67)

CRAN version 0.3.0

• Methods for sf and sfc classes have been added (#46)
• rmapshaperid column is only retained if it is the only column, otherwise it's dropped.
• ms_innerlines returns only the geometry for sf and Spatial*DataFrame classes. (#57)
• ms_dissolve gains a weight argument for generating weighted centroids of dissolved points. (#39)

CRAN version 0.2.0

• Added snap_interval to ms_simplify() (#43, @nikolai-b)
• Bugfix: Respect drop_null_geometries argument in ms_simplify.geo_list() (#45, @nikolai-b)
• Add Kent Russell (@timelyportfolio) to authors list for his JavaScript expertise and advice
• Add Matthew Bloch (@mbloch) to authors list as mapshaper copyright holder
• Update mapshaper to version 0.3.41
• A V8 session is now launched once per function call and destroyed when the function exits, rather than created on package load and retained for the entire session (#49)
• Column classes are now restored after being sent through mapshaper functions (#46)
• Fixed a bug where very small values of keep in ms_simplify() were converted to scientific notation (#48)
• Added weighting argument to ms_simplify() (#27)
• Added remove_slivers argument in ms_clip() and ms_erase()