Vim: Case Conversion, ROT13, and Number Arithmetic with CTRL-A/CTRL-X

*gUgU* *gUU* gUU Make current line uppercase. *v_u* {Visual}u Make highlighted text lowercase (for {Visual} see |Visual-mode|). *gu* *lowercase* gu{motion} Make {motion} text lowercase. gugu *gugu* *guu* guu Make current line lowercase. *g?* *rot13* g?{motion} Rot13 encode {motion} text. *v_g?* {Visual}g? Rot13 encode the highlighted text (for {Visual} see |Visual-mode|). g?g? *g?g?* *g??* g?? Rot13 encode current line. To turn one line into title caps, make every first letter of a word uppercase: > :s/\v<(.)(\w*)/\u\1\L\2/g Adding and subtracting ~ *CTRL-A* CTRL-A Add [count] to the number or alphabetic character at or after the cursor. *v_CTRL-A* {Visual}CTRL-A Add [count] to the number or alphabetic character in the highlighted text. *v_g_CTRL-A* {Visual}g CTRL-A Add [count] to the number or alphabetic character in the highlighted text. If several lines are highlighted, each one will be incremented by an additional [count] (so effectively creating a [count] incrementing sequence). For Example, if you have this list of numbers: 1. ~ 1. ~ 1. ~ 1. ~ Move to the second "1." and Visually select three lines, pressing g CTRL-A results in: 1. ~ 2. ~ 3. ~ 4. ~ *CTRL-X* CTRL-X Subtract [count] from the number or alphabetic character at or after the cursor. *v_CTRL-X* {Visual}CTRL-X Subtract [count] from the number or alphabetic character in the highlighted text. *v_g_CTRL-X* {Visual}g CTRL-X Subtract [count] from the number or alphabetic character in the highlighted text. If several lines are highlighted, each value will be decremented by an additional [count] (so effectively creating a [count] decrementing sequence). The CTRL-A and CTRL-X commands work for (signed) decimal numbers, unsigned binary/octal/hexadecimal numbers and alphabetic characters. This depends on the 'nrformats' option: - When 'nrformats' includes "bin", Vim assumes numbers starting with '0b' or '0B' are binary. - When 'nrformats' includes "octal", Vim considers numbers starting with a '0' to be octal, unless the number includes a '8' or '9'. Other numbers are decimal and may have a preceding minus sign. If the cursor is on a number, the commands apply to that number; otherwise Vim uses the number to the right of the cursor. - When 'nrformats' includes "hex", Vim assumes numbers starting with '0x' or '0X' are hexadecimal. The case of the rightmost letter in the number determines the case of the resulting hexadecimal number. If there is no letter in the current number, Vim uses the previously detected case. - When 'nrformats' includes "alpha", Vim will change the alphabetic character under or after the cursor. This is useful to make lists with an alphabetic index. For decimals a leading negative sign is considered for incrementing or decrementing, for binary, octal and hex values, it won't be considered. To ignore the sign Visually select the number before using CTRL-A or CTRL-X. For numbers with leading zeros (including all octal and hexadecimal numbers), Vim preserves the number of characters in the number when possible. CTRL-A on "0077" results in "0100", CTRL-X on "0x100" results in "0x0ff". There is one exception: When a number that starts with a zero is found not to be octal (it contains a '8' or '9'), but 'nrformats' does include "octal", leading zeros are removed to avoid that the result may be recognized as an octal number. Note that when 'nrformats' includes "octal", decimal numbers with leading zeros cause mistakes, because they can be confused with octal numbers. Note similarly, when 'nrformats' includes both "bin" and "hex", binary numbers with a leading '0x' or '0X' can be interpreted as hexadecimal rather than binary since '0b' are valid hexadecimal digits. CTRL-A on "0x0b11"

This section details Vim's capabilities for case conversion, ROT13 encoding, and arithmetic operations on numbers and characters. It covers commands for converting lines to uppercase ('gUU'), lowercase ('guu'), and applying ROT13 ('g??'), along with their visual mode equivalents. Additionally, it explains how to use CTRL-A and CTRL-X for incrementing and decrementing numbers and alphabetical characters, including visual mode operations that can create incrementing/decrementing sequences across multiple lines. It elaborates on how the 'nrformats' option influences the interpretation of numbers as binary, octal, decimal, or hexadecimal, and how leading zeros are handled during these operations. It also covers how 'alpha' in 'nrformats' affects alphabetic character adjustments.