Tool to generate chord and scale shapes for any uniformly fretted instrument for any musical system

Building the program

If not already done, install git on your system. See https://git-scm.com/book/en/v2/Getting-Started-Installing-Git.
If not already done, install the Go programming language on your system. See https://golang.org/doc/install.
If not already done, install the goimports tool by running go install golang.org/x/tools/cmd/goimports@latest
If not already done, install the golint tool by running go install golang.org/x/lint/golint@latest.
If not already done, install make. The instructions can vary by OS and distribution.
Clone this repository. See https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository-from-github/cloning-a-repository.
Go into the cloned directory, for example in Unix / Linux systems by running cd guitar-patterns.
Build the program by running make. This will generate the binary at ./bin/main.

Running the program

Basics

To run the program, just type ./bin/main with the appropriate command line arguments as will be shown below. This needs to be done from the command line terminal. If you have only used graphical interfaces in the past, this might sound daunting, but it is easy. There are several resources online.

Available printers

The program will print output to STDOUT. In simple words, this means that the output will print to the screen.

There are two output options available.

ASCII (default) - lightweight for those who prefer to stay on the terminal.
SVG (when run with -svg) - convenient because the SVG output can be converted to JPG or PNG using free converter tools available online.

If you want the output to go to a file (which you will likely need when using the SVG option), you will need to redirect the output to the file such as ./bin/main -svg {some args} > somefileonthecomputer.svg.

Accessibility options

Run with the -left argument if you are left handed.

Use cases

All examples shown here print in ASCII and use right-handedness.

Simple chord - e.g. minor chord

There are 3 steps between the root and the next note, and then 4 steps from that one to the next.

$ ./bin/main -s 3 -s 4

|----|----|----|-1--|
|----|----|----|-5--|
|-1--|----|----|-b3-|
|-5--|----|----|----|
|----|-b3-|----|----|
|----|----|----|-1--|

...

Chords can have more than 3 notes - e.g. dominant 7th chord

$ ./bin/main -s 4 -s 3 -s 3

|----|-b7-|----|-1--|
|-3--|----|----|-5--|
|-1--|----|----|----|
|-5--|----|----|-b7-|
|----|----|-3--|----|
|----|-b7-|----|-1--|

...

Chords can wrap around - e.g. major 7th add 9 chord

$ ./bin/main -s 4 -s 3 -s 4 -s 3

|----|----|-7--|-1--|
|-3--|----|----|-5--|
|-1--|----|-2--|----|
|-5--|----|----|----|
|-2--|----|-3--|----|
|----|----|-7--|-1--|

...

Can handle scales - e.g. harmonic minor scale

$ ./bin/main -s 2 -s 1 -s 2 -s 2 -s 1 -s 3

|----|----|-7--|-1--|
|----|-4--|----|-5--|
|-1--|----|-2--|-b3-|
|-5--|-b6-|----|----|
|-2--|-b3-|----|-4--|
|----|----|-7--|-1--|

...

Can change the number of frets per pattern - e.g. minor pentatonic scale with 5 frets per pattern

$ ./bin/main -s 3 -s 2 -s 2 -s 3 -frets 5

|----|----|-b7-|----|-1--|
|-b3-|----|-4--|----|-5--|
|----|-1--|----|----|-b3-|
|----|-5--|----|----|-b7-|
|----|----|-b3-|----|-4--|
|----|----|-b7-|----|-1--|

...

Can view how the pattern looks across all 12 frets e.g. sus4 chord sweep

$ ./bin/main -s 5 -s 2 -frets 12

|----|----|----|-4--|----|-5--|----|----|----|----|-1--|----|
|----|----|----|-1--|----|----|----|----|-4--|----|-5--|----|
|-4--|----|-5--|----|----|----|----|-1--|----|----|----|----|
|-1--|----|----|----|----|-4--|----|-5--|----|----|----|----|
|-5--|----|----|----|----|-1--|----|----|----|----|-4--|----|
|----|----|----|-4--|----|-5--|----|----|----|----|-1--|----|

...

Can change guitar tuning - e.g. diminished chord with open tuning

$ ./bin/main -s 3 -s 3 -ss 7 -ss 5 -ss 4 -ss 3 -ss 5

|----|-1--|----|----|
|-#4-|----|----|----|
|-b3-|----|----|-#4-|
|----|-1--|----|----|
|-#4-|----|----|----|
|----|-1--|----|----|

...

Can extend to any uniformly fretted string instrument with any number of strings - e.g. major 6th chord on 5 string banjo

$ ./bin/main -s 4 -s 3 -s 2 -ss 7 -ss 5 -ss 4 -ss 3

...

|-6--|----|----|-1--|
|----|-5--|----|-6--|
|----|----|-3--|----|
|-6--|----|----|-1--|
|----|----|-3--|----|

...

Can rename the 12 notes to suit typical western notation - e.g. C sus 2 chord

$ ./bin/main -s 2 -s 5 -n "C" -n "Db" -n "D" -n "Eb" -n "E" -n "F" -n "F#" -n "G" -n "Ab" -n "A" -n "Bb" -n "B"

|----|----|----|-C--|
|----|----|----|-G--|
|-C--|----|-D--|----|
|-G--|----|----|----|
|-D--|----|----|----|
|----|----|----|-C--|

...

Can pick a specific key - e.g. F augmented chord

$ ./bin/main -r 5 -s 4 -s 4 -n "C" -n "Db" -n "D" -n "Eb" -n "E" -n "F" -n "F#" -n "G" -n "Ab" -n "A" -n "Bb" -n "B"

|----|----|----|-F--|
|-A--|----|----|----|
|-F--|----|----|----|
|----|-Db-|----|----|
|----|----|-A--|----|
|----|----|----|-F--|

...

Can work with any music system - e.g. hypothetical music system with only 7 notes

$ ./bin/main -s 2 -s 3 -n "R" -n "Sh" -n "Tr" -n "Qw" -n "Qb" -n "Si" -n "Se"

|-R--|----|-Tr-|----|
|-Tr-|----|----|-Si-|
|-Si-|----|-R--|----|
|-R--|----|-Tr-|----|
|-Tr-|----|----|-Si-|
|----|-Si-|----|-R--|

...