code_to_plan(), plan_to_code(), and plan_to_notebook() together illustrate the relationships between drake plans, R scripts, and R Markdown documents.

code_to_plan(path)

Arguments

path

A file path to an R script or knitr report.

Details

This feature is easy to break, so there are some rules for your code file:

  1. Stick to assigning a single expression to a single target at a time. For multi-line commands, please enclose the whole command in curly braces. Conversely, compound assignment is not supported (e.g. target_1 <- target_2 <- target_3 <- get_data()).

  2. Once you assign an expression to a variable, do not modify the variable any more. The target/command binding should be permanent.

  3. Keep it simple. Please use the assignment operators rather than assign() and similar functions.

See also

Examples

plan <- drake_plan( raw_data = read_excel(file_in("raw_data.xlsx")), data = raw_data, hist = create_plot(data), fit = lm(Ozone ~ Temp + Wind, data) ) file <- tempfile() # Turn the plan into an R script a the given file path. plan_to_code(plan, file)
#> Loading required namespace: styler
# Here is what the script looks like. cat(readLines(file), sep = "\n")
#> raw_data <- read_excel(file_in("raw_data.xlsx")) #> data <- raw_data #> fit <- lm(Ozone ~ Temp + Wind, data) #> hist <- create_plot(data)
# Convert back to a drake plan. code_to_plan(file)
#> # A tibble: 4 x 2 #> target command #> <chr> <expr_lst> #> 1 raw_data read_excel(file_in("raw_data.xlsx")) #> 2 data raw_data #> 3 fit lm(Ozone ~ Temp + Wind, data) #> 4 hist create_plot(data)