Gum

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A tool for glamorous shell scripts. Leverage the power of Bubbles and Lip Gloss in your scripts and aliases without writing any Go code!

Shell running the ./demo.sh script

The above example is running from a single shell script (source).

Tutorial

Gum provides highly configurable, ready-to-use utilities to help you write useful shell scripts and dotfiles aliases with just a few lines of code.

Let’s build a simple script to help you write Conventional Commits for your dotfiles.

Start with a #!/bin/sh.

#!/bin/sh

Ask for the commit type with gum choose:

gum choose "fix" "feat" "docs" "style" "refactor" "test" "chore" "revert"

Tip: this command itself will print to stdout which is not all that useful. To make use of the command later on you can save the stdout to a $VARIABLE or file.txt.

Prompt for an (optional) scope for the commit:

gum input --placeholder "scope"

Prompt for a commit message:

gum input --placeholder "Summary of this change"

Prompt for a detailed (multi-line) explanation of the changes:

gum write --placeholder "Details of this change"

Prompt for a confirmation before committing:

gum confirm exits with status 0 if confirmed and status 1 if cancelled.

gum confirm "Commit changes?" && git commit -m "$SUMMARY" -m "$DESCRIPTION"

Putting it all together…

#!/bin/sh
TYPE=$(gum choose "fix" "feat" "docs" "style" "refactor" "test" "chore" "revert")
SCOPE=$(gum input --placeholder "scope")

# Since the scope is optional, wrap it in parentheses if it has a value.
[[ -n "$SCOPE" ]] && SCOPE="($SCOPE)"

# Pre-populate the input with the type(scope): so that the user may change it
SUMMARY=$(gum input --value "$TYPE$SCOPE: " --placeholder "Summary of this change")
DESCRIPTION=$(gum write --placeholder "Details of this change")

# Commit these changes
gum confirm "Commit changes?" && git commit -m "$SUMMARY" -m "$DESCRIPTION"

Running the ./examples/commit.sh script to commit to git

Installation

Use a package manager:

# macOS or Linux
brew tap charmbracelet/tap && brew install charmbracelet/tap/gum

# Arch Linux (btw)
yay -S gum-bin

# Nix
nix-env -iA nixpkgs.gum

# Debian/Ubuntu
echo 'deb [trusted=yes] https://repo.charm.sh/apt/ * *' | sudo tee /etc/apt/sources.list.d/charm.list
sudo apt update && sudo apt install gum

# Fedora
echo '[charm]
name=Charm
baseurl=https://repo.charm.sh/yum/
enabled=1
gpgcheck=0' | sudo tee /etc/yum.repos.d/charm.repo
sudo yum install gum

Or download it:

  • Packages are available in Debian and RPM formats
  • Binaries are available for Linux, macOS, and Windows

Or just install it with go:

go install github.com/charmbracelet/[email protected]

Customization

gum is designed to be embedded in scripts and supports all sorts of use cases. Components are configurable and customizable to fit your theme and use case.

You can customize with --flags. See gum <command> --help for a full view of each command’s customization and configuration options.

For example, let’s use an input and change the cursor color, prompt color, prompt indicator, placeholder text, width, and pre-populate the value:

gum input --cursor.foreground "#FF0" --prompt.foreground "#0FF" --prompt "* " \
    --placeholder "What's up?" --width 80 --value "Not much, hby?"

Gum input displaying most customization options

Interaction

Input

Prompt for input with a simple command.

gum input > answer.text

Shell running gum input typing Not much, you?

Write

Prompt for some multi-line text.

gum write > story.text

Shell running gum write typing a story

Filter

Use fuzzy matching to filter a list of values:

echo Strawberry >> flavors.text
echo Banana >> flavors.text
echo Cherry >> flavors.text
cat flavors.text | gum filter > selection.text

Shell running gum filter on different bubble gum flavors

Choose

Choose an option from a list of choices.

echo "Pick a card, any card..."
CARD=$(gum choose --height 15 {{A,K,Q,J},{10..2}}" "{♠,♥,♣,♦})
echo "Was your card the $CARD?"

You can also select multiple items with the --limit flag, which determines the maximum of items that can be chosen.

echo "Pick your top 5 songs."
cat songs.txt | gum choose --limit 5

Or, allow any number of selections with the --no-limit flag.

echo "What do you need from the grocery store?"
cat foods.txt | gum choose --no-limit

Shell running gum choose with numbers and gum flavors

Confirm

Confirm whether to perform an action. Exits with code 0 (affirmative) or 1 (negative) depending on selection.

gum confirm && rm file.txt || echo "File not removed"

Shell running gum confirm

Spin

Display a spinner while running a script or command. The spinner will automatically stop after the given command exits.

gum spin --spinner dot --title "Buying Bubble Gum..." -- sleep 5

Shell running gum spin while sleeping for 5 seconds

Styling

Style

Pretty print any string with any layout with one command.

gum style \
	--foreground 212 --border-foreground 212 --border double \
	--align center --width 50 --margin "1 2" --padding "2 4" \
	'Bubble Gum (1¢)' 'So sweet and so fresh!'

Bubble Gum, So sweet and so fresh!

Layout

Join

Combine text vertically or horizontally. Use this command with gum style to build layouts and pretty output.

Tip: Always wrap the output of gum style in quotes to preserve newlines (\n) when using it as an argument in the join command.

I=$(gum style --padding "1 5" --border double --border-foreground 212 "I")
LOVE=$(gum style --padding "1 4" --border double --border-foreground 57 "LOVE")
BUBBLE=$(gum style --padding "1 8" --border double --border-foreground 255 "Bubble")
GUM=$(gum style --padding "1 5" --border double --border-foreground 240 "Gum")

I_LOVE=$(gum join "$I" "$LOVE")
BUBBLE_GUM=$(gum join "$BUBBLE" "$GUM")
gum join --align center --vertical "$I_LOVE" "$BUBBLE_GUM"

I LOVE Bubble Gum written out in four boxes with double borders around them.

Format

format processes and formats bodies of text. gum format can parse markdown, template strings, and named emojis.

# Format some markdown
gum format -- "# Gum Formats" "- Markdown" "- Code" "- Template" "- Emoji"
echo "# Gum Formats\n- Markdown\n- Code\n- Template\n- Emoji" | gum format

# Syntax highlight some code
cat main.go | gum format -t code

# Render text any way you want with templates
echo '{{ Bold "Tasty" }} {{ Italic "Bubble" }} {{ Color "99" "0" " Gum " }}' \
    | gum format -t template

# Display your favorite emojis!
echo 'I :heart: Bubble Gum :candy:' | gum format -t emoji

For more information on template helpers, see the Termenv docs. For a full list of named emojis see the GitHub API.

Running gum format for different types of formats

Examples

See the examples directory for more real world use cases.

How to use gum in your daily workflows:

Write a commit message

Prompt for input to write git commit messages with a short summary and longer details with gum input and gum write.

Bonus points: use gum filter with the Conventional Commits Specification as a prefix for your commit message.

git commit -m "$(gum input --width 50 --placeholder "Summary of changes")" \
           -m "$(gum write --width 80 --placeholder "Details of changes")"

Open files in your $EDITOR

By default, gum filter will display a list of all files (searched recursively) through your current directory, with some sensible ignore settings (.git, node_modules). You can use this command to easily to pick a file and open it in your $EDITOR.

$EDITOR $(gum filter)

Connect to a TMUX session

Pick from a running tmux session and attach to it. Or, if you’re already in a tmux session, switch sessions.

SESSION=$(tmux list-sessions -F \#S | gum filter --placeholder "Pick session...")
tmux switch-client -t $SESSION || tmux attach -t $SESSION

Picking a tmux session with gum filter

Pick commit hash from your Git history

Filter through your git history searching for commit messages, copying the commit hash of the commit you select.

git log --oneline | gum filter | cut -d' ' -f1 # | copy

Picking a commit with gum filter

Choose packages to uninstall

List all packages installed by your package manager (we’ll use brew) and choose which packages to uninstall.

brew list | gum choose --no-limit | xargs brew uninstall

Feedback

We’d love to hear your thoughts on this project. Feel free to drop us a note!

License

MIT


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