### Install rcmdcheck Package

Source: https://r-lib.github.io/rcmdcheck

Install the rcmdcheck package from CRAN.

```r
install.packages("rcmdcheck")
```

--------------------------------

### Get CRAN Check Flavors

Source: https://r-lib.github.io/rcmdcheck

Downloads the names of available CRAN platforms for package checks. Use this to understand the environments for which checks are performed.

```r
cran_check_flavours()
```

--------------------------------

### Run R CMD check on a Package

Source: https://r-lib.github.io/rcmdcheck

Run R CMD check on a source R package tarball or a folder containing an R package. Set `quiet = FALSE` to display output during the check.

```r
library(rcmdcheck)
rcmdcheck("path/to/R/package")
```

--------------------------------

### Load CRAN Check Results for a Package

Source: https://r-lib.github.io/rcmdcheck

Loads and parses all R CMD check results for a specified package across various CRAN flavors. This provides detailed information on errors, warnings, and notes for each platform.

```r
cran_check_results("igraph")
```

--------------------------------

### Compare R CMD check to CRAN

Source: https://r-lib.github.io/rcmdcheck

Compares the results of a local R CMD check with the official CRAN checks for the same package. This is useful for identifying discrepancies introduced in local development.

```R
chk <- rcmdcheck(quiet = TRUE)
compare_to_cran(chk)
#> ── R CMD check comparison ────────────────────────────────────────────────────────────── rcmdcheck 1.3.3 / 1.3.3.9000 ────
#> Status: OK
#>
#> ── Fixed
#>
#> ✔ checking LazyData ... NOTE
#> ✔ checking LazyData ... NOTE
#> ✔ checking LazyData ... NOTE
#> ✔ checking LazyData ... NOTE
#> ✔ checking LazyData ... NOTE
#> ✔ checking LazyData ... NOTE
```

--------------------------------

### Capture and Display R CMD check Results

Source: https://r-lib.github.io/rcmdcheck

Execute R CMD check on a package and capture the results in an `rcmdcheck` object. The object can be printed to display a summary of the check, including errors, warnings, and notes.

```r
library(rcmdcheck)
chk <- rcmdcheck("tests/testthat/bad1", quiet = TRUE)
chk
```

--------------------------------

### Extract Details from R CMD check Results

Source: https://r-lib.github.io/rcmdcheck

Use `check_details()` to convert the `rcmdcheck` object into a list containing specific details about the package check, such as package name, version, errors, warnings, notes, and session information.

```r
names(check_details(chk))
```

--------------------------------

### Run R CMD check in Background

Source: https://r-lib.github.io/rcmdcheck

Initiates an R CMD check process in the background using rcmdcheck_process, which is a subclass of processx::process. This allows for concurrent checks and programmatic control over the process.

```R
chkpx <- rcmdcheck_process$new()
chkpx
#> PROCESS 'R', running, pid 82576.
```

--------------------------------

### Wait for and Parse Background Check Results

Source: https://r-lib.github.io/rcmdcheck

Waits for a background R CMD check process to complete and then parses its results. This is used after initiating a check with rcmdcheck_process$new().

```R
chkpx$wait()
chkpx$parse_results()
#> ── R CMD check results ───────────────────────────────────────────────────────────────────────── rcmdcheck 1.3.3.9000 ────
#> Duration: 23.6s
#>
#> 0 errors ✔ | 0 warnings ✔ | 0 notes ✔
```

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