datasusr 0.1.0

CRAN review fixes

DESCRIPTION now consistently single-quotes external software/API names (‘DATASUS’, ‘DBC’, ‘DBF’, ‘FTP’, ‘C’, ‘PKWare DCL’, ‘blast’, ‘zlib’) and unquotes the in-package function reference datasus_fetch(). The description field also now references the upstream sources (DATASUS file transfer site and Adler 2003 for the bundled blast decompressor).
All examples switched from \dontrun{} to \donttest{}. Network- dependent examples are wrapped in tryCatch() and write to tempdir() so that running them never touches the user’s home filespace.
The default cache directory is now a session-scoped subdirectory of tempdir() instead of tools::R_user_dir("datasusr", "cache"). To opt in to a persistent cache across sessions, set the DATASUSR_CACHE_DIR environment variable, the datasusr.cache_dir R option, or pass cache_dir explicitly.

Package version bumped to 0.1.0 to reflect the expanded scope beyond just reading DBC files.

datasus_fetch(): high-level convenience function that lists, downloads, and reads DATASUS files in a single call. Supports column selection, type specification, and row-binding of multiple files.
DATASUSR_CACHE_DIR environment variable: the cache directory now respects the DATASUSR_CACHE_DIR env var in addition to the existing datasusr.cache_dir option.
format_bytes() is now exported for general use.

Fixed SIM path templates: DOEXT, DOINF, and DOMAT previously pointed to the DOFET FTP directory. Each now has its own correct path.
Fixed column/argument name shadowing in datasus_build_path(), datasus_file_types(), and datasus_list_files(). Column names like source and file_type no longer clash with function arguments thanks to proper use of .env$ pronouns.
Download failures no longer abort the loop: individual FTP download errors are caught and reported without stopping the remaining downloads.
Empty file lists now return immediately from datasus_download() instead of proceeding with zero iterations.

Removed all .data$ pronoun usage inside dplyr verbs. Columns are now referenced with bare (tidy evaluation) names, and external variables use .env$ where needed. This follows current tidyverse best practice.
Replaced deprecated purrr functions: pmap_dfr() replaced with map2() |> list_rbind().
Replaced purrr::map_lgl() in cache functions with base vapply() for fewer dependencies in hot paths.
Improved CLI messages throughout: all user-facing messages now use cli::cli_abort() with structured hints (i bullets) instead of bare stop(). Progress messages are more concise and informative.
Wrapped FTP connection errors with a user-friendly message suggesting a connectivity check.
rlang is now an explicit dependency (was already an indirect dep via dplyr), making the %||% import explicit.
Added rlang (>= 1.0.0) and dplyr (>= 1.1.0) minimum version constraints.
Vignettes expanded with richer explanations and a new comparison article.
pkgdown site structure updated with a comparison article.
Compiled .o and .so files excluded from the source bundle via .Rbuildignore.

Fixed dplyr data-masking bugs in catalog and file listing helpers.
Removed .data$ usage inside mutate pipelines and simplified tidyverse expressions.
Improved verbose output in read_datasus_dbc() so row and column counts print on separate lines.

Fixed datasus_file_types(source = ...) filtering consistency.
Improved cli spacing and summary formatting in key functions.
Filtered invalid source/file type combinations earlier in datasus_list_files().

Added a configurable cache layer for DATASUS downloads.
Added datasus_cache_dir(), datasus_cache_list(), datasus_cache_info(), datasus_cache_clear(), and datasus_cache_prune().
Integrated cache-aware downloads into datasus_download().

Added DATASUS catalog helpers: datasus_sources(), datasus_modalities(), datasus_file_types(), and datasus_ufs().
Added FTP helpers: datasus_ftp_ls(), datasus_build_path(), datasus_list_files(), and datasus_download().