Elivicti/Increment-Diff

Increment Diff

This utility program is used for generating increment update patch. It compare file's version by checking its sha1 hash value.

For example, version 1 of my_dir looks like this:

my_dir
 |- a.txt
 |- b.txt
 |- c.txt
 \- sub_dir
     \- d.txt

Then in version 2, d.txt is modified, c.txt is deleted, note.txt is added:

my_dir
 |- a.txt
 |- b.txt
 |- note.txt
 \- sub_dir
     \- d.txt

This program is able to make a increment diff:

my_dir_ver2_diff
 |- note.txt
 \- sub_dir
     \- d.txt

and a script file used for deleting files that no longer exists in version 2.

Then, simply copy paste everything from my_dir_ver2_diff to version 1 of my_dir, and run script file on my_dir (which takes directory path as the first command line argument, and deletes files that no longer exist in version 2). Now, my_dir is updated to version 2.

How is this useful? I'm not sure. ¯\(ツ)/¯

How to build

This program requires C++20, make sure your compiler supports it.

cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build --config Release --target IncrementDiff -j 8

Cmake options

USE_FMT: set to 1 to let cmake find fmtlib and use it for formatting strings. If USE_FMT is not set, or is set to 1 but fmtlib is not found, std::format is used to format strings.

Dependencies

• CryptoPP and cryptopp-cmake:

  Used to compute file's hash value.

• CLI11:

  Used to create command line interface.

• fmtlib (Optional)

  Optional library for formatting strings, see Cmake options for more details.