RenatoGeh / snippets

Bunch of snippets of various kinds and flavors.

Snippets

1. pgm_compress.cpp:

• Compresses PGM image files to an n-bit new PGM.

2. pgm_histogram.cpp:

• Prints histogram of color usage of a set of grayscale PGM images files.

3. rcompress.sh:

• Recursively find each PGM file in a given directory.
• Creates an n-bit compressed PGM of each found PGM file.
• Constructs a histogram out of all such PGM n-bit files.
• Prints histogram to the stdin.

3. trim.sh:

• Trims an image with 10% fuzzy rate.

4. jpg2pgm.sh:

• Resizes all files to a given (x, y) size.
• Searches for files in directories one level down.
• Ignores aspect ratio.

5. count.sh:

• Counts number of files in directories one level down.
• Prints each count, mean, max and min.

6. coin.sh:

• For each directory inside pwd, toss a coin for each PGM file in it.
• If heads, put it in a folder named train inside the directory being scanned.
• If tails, put it in test.
• Number of files is limited by ntest and ntrain.

7. word_count.cpp:

• Takes a .voc file and counts word occurences (frequencies and percentage).

8. prune_words.cpp:

• Takes a .voc file and rewrites it as a new vocabulary containing only the k most frequent words.
• Optionally deletes words that do not meet the criterion.

9. longest_word.sh:

• Searches for the longest word in a file.

10. rand_sq_gen.cpp:

• Generates a .pgm file containing an NxN (where N is a defined macro) square with n black squares in random positions.

11. sq_gen.cpp:

• Let N be the size of a square. sq_gen.cpp generates N-1 distinct instances of an NxN square with n random black squares in random distinct positions.

12. has_duplicate.sh:

• Given a set of files F, let i and j in F be distinct files. has_duplicate.sh returns whether there exists i and j such that the contents of i are equal to those of j.

13. cat_sq_gen.sh:

• For every possible n black squares configurations in a square of NxN dimension, create a category for each n and output N^2 configurations into their respective categories.

14. pgm2data.sh:

• Generates k random PGM images given a width, height and maximum pixel value.
• Debug mode generates individual PGM files for visualization.
• Compiles the k images into a .data file as specified in https://github.com/RenatoGeh/gospn.

15. unique_id.go:

• Tests a one-to-one and onto function for subrectangles in a rectangle.

16. split_audio.sh:

• Takes an audio or video f and splits it into pieces.
• Every timestamp given as argument splits f from the previous timestamp to the next timestamp.
• Great for splitting a single file album audio into multiple singles!

17. extract_ty.sh:

• Takes a YouTube URL, downloads the video, extracts the audio (.mp3) and splits it into different sections based on timestamps.
• Uses split_audio.sh to split it by timestamps.

18. diff_cmp.sh:

• Takes a directory and an expression. Finds all same name files from current directory and given directory. For each of these files, use NeoVim's diff tool.
• Useful for manually applying patches from different branches of the same repository.

19. draw_scope.sh:

• Draws the assigned pixels in a w x h image.

20. pgauss.go:

• Returns the probability of a value in a gaussian distribution with mean and standard deviation given.
• Returns up to p digits of precision.
• Requires GoNum.

21. argrun.sh:

• Takes a file f and command c.
• For each line l in f, run c with l as arguments.

22. prepend.sh:

• Prepends contents of first file to all remaining files.

23. extract_credits.sh:

• Extracts credit information from University of São Paulo's (USP) course webpage.
• Takes a list of courses and outputs the number of theory and practical credits, aswell as total credits for each type of credit.
• Requires lynx.

24. spot.sh:

• Prints sidescrolling Spotify information.
• Requires playerctl and the Spotify App.
• Great for i3status bar.
• Prints Title, Artist and Album.
• Prompt cycles sideways every second, avoiding long titles to be hidden by other i3status components.
• Skips ads every even second if ad is being played.

25. draw_region.sh:

• Draws a region of a rectangle given width, height and pixels.

26. list_ratios.c:

• Takes arguments w, h and d, where (w, h) are dimensions and d divides w and h.
• Returns all possible dimensions (x, y) such that d divides both x and y, and ordered s.t. the ratio x/y is the closest to w/h.

27. binder_org.py:

• Binder organizer for music sheets or other compatible formats.
• Prints how a binder should be organized given a set of sheets.
• Output is ordered alphabetically and either categorized by author or title's first letter.
• Load from file or directly through methods.

28. gentags.sh:

• Generate ctags for a given library.

29. generate_all.sh

• Utility script for generating ctags for common libs.

30. generate_ttt.c

• Generate all possible endgame configurations of the tic-tac-toe game.