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Daff: diff, patch and merge for data.frames

daff is an R package that can find difference in values between data.frames, store this difference, render it and apply this difference to patch a data.frame. It can also merge two versions of a data.frame having a common parent. It wraps the daff.js library using the V8 package.

The diff format is described in https://paulfitz.github.io/daff-doc/spec.html.

Functions:

diff: diff_data
patch: patch_data
write/read diff: read_diff and write_diff
render to html: render_diff
merge two tables based on a same version: merge_data

Installation

You can install the development version of daff from GitHub with:

# install.packages("devtools")
devtools::install_github("edwindj/daff")

Usage

diff_data

Calculate the difference between a reference and a changed data.frame

library(daff)
y <- iris[1:3,]
x <- y

x <- head(x,2) # remove a row
x[1,1] <- 10 # change a value
x$hello <- "world"  # add a column
x$Species <- NULL # remove a column

patch <- diff_data(y, x)

# write a patch to disk
write_diff(patch, "patch.csv")

render_diff(patch) will generate the following HTML page:

patch_data

Patch a data.frame using a diff generated with diff_data.

# read a diff from disk
patch <- read_diff("patch.csv")

# apply patch
y_patched <- patch_data(y, patch)

merge_data

Merge two data.frames that have diverged from a common parent data.frame.

parent <- a <- b <- iris[1:3,]
a[1,1] <- 10
b[2,1] <- 11
# succesful merge
merge_data(parent, a, b)

parent <- a <- b <- iris[1:3,]
a[1,1] <- 10
b[1,1] <- 11
# conflicting merge (both a and b change same cell)
merged <- merge_data(parent, a, b)
merged #note the conflict

#find out which rows contain a conflict
which_conflicts(merged)

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.