prmt 🚀

Ultra-fast, customizable shell prompt that won't slow you down

Rendered with "{path:#89dceb}{rust:#f38ba8:f: 🦀}{git:#f9e2af:f: }\n{ok:#a6e3a1}{fail:#f38ba8} "

Features

• ⚡ Blazing Fast: Sub-millisecond rendering for typical prompts (~2ms end-to-end)
• 🎨 Highly Customizable: Full control over colors, formats, and what information to show
• 🚀 Context Aware: Automatically detects git repos, project files, shows only what's relevant
• 📦 Zero Dependencies: Single binary, no runtime dependencies required
• 🦀 Memory Efficient: Zero-copy parsing with SIMD optimizations
• ✨ Smart Rendering: Only shows information when relevant to your current directory

Why prmt?

Faster than alternatives – Typical prompts render in ~2ms. Starship averages 10-50ms, oh-my-posh 20-100ms.

Zero configuration needed – Works out of the box with sensible defaults. Customize only what you want.

Predictable performance – No async operations, no network calls, no surprises. Your prompt is always instant.

Single binary – Just install and go. No configuration files required unless you want them.

Context-aware – Automatically detects git repositories, Rust/Node/Python projects, and shows only relevant info.

Quick Start

1. Install

cargo install prmt

2. Add to your shell (pick one)

Bash – Add to ~/.bashrc:

# Simple with named colors
PS1='$(prmt --code $? "{path:cyan} {git:purple} {ok:green}{fail:red} ")'

# Explicit shell wrapping (recommended for prompt usage)
PS1='$(prmt --shell bash --code $? "{path:cyan} {git:purple} {ok:green}{fail:red} ")'

# Or with hex colors for precise theming
PS1='$(prmt --code $? "{path:#89dceb} {git:#f9e2af} {ok:#a6e3a1}{fail:#f38ba8} ")'

Zsh – Add to ~/.zshrc (auto-detected by default; --shell zsh forces wrapping):

setopt PROMPT_SUBST

# Simple with named colors
PROMPT='$(prmt --shell zsh --code $? "{path:cyan} {git:purple} {ok:green}{fail:red} ")'

# Or with hex colors for precise theming
PROMPT='$(prmt --shell zsh --code $? "{path:#89dceb} {git:#f9e2af} {ok:#a6e3a1}{fail:#f38ba8} ")'

Fish – Add to ~/.config/fish/config.fish:

function fish_prompt
    prmt --code $status '{path:cyan} {git:purple} {ok:green}{fail:red} '
end

3. Reload your shell

exec $SHELL  # or open a new terminal

Done! 🎉

Bash with PROMPT_COMMAND

function _prmt_prompt() {
    local last=$?
    PS1="$(prmt --code $last '{path:cyan} {git:purple} {ok:green}{fail:red}')"
}
PROMPT_COMMAND=_prmt_prompt

If you already use PROMPT_COMMAND, append _prmt_prompt instead of overwriting it.

Bash transient prompt (no ble.sh)

PS1='$(prmt --shell bash --code $? "{path:cyan} {git:purple} {ok:green}{fail:red} ")'

function _prmt_lastcommand() {
    history | tail -1 | cut -c 8-
}

function _prmt_deleteprompt() {
    local prompt=${PS1@P}
    local lines=${prompt//[^$'\n']}
    local count=${#lines}
    tput cuu $((count + 1))
    tput ed
}

function _prmt_indicator() {
    prmt --shell bash --code ${1:-0} "{ok:green}> {fail:red}> "
}

PS0='\[$(_prmt_deleteprompt)\]$(_prmt_indicator ${LAST_EXIT_CODE}) $(_prmt_lastcommand)\n\[${PS1:0:$((EXPS0=1,0))}\]'
PROMPT_COMMAND='LAST_EXIT_CODE=$?; [ "$EXPS0" = 0 ] && _prmt_deleteprompt && echo -e "$(_prmt_indicator ${LAST_EXIT_CODE})" || EXPS0=0'

This replaces the full prompt with a compact one after the command runs. It relies on tput and Bash 4.4+.

Zsh with precmd

function _prmt_precmd() {
    local code=$?
    PROMPT="$(prmt --code $code '{path:cyan} {git:purple} {ok:green}{fail:red}')"
}
typeset -ga precmd_functions
precmd_functions+=(_prmt_precmd)

PowerShell

# Add to $PROFILE
function prompt {
    prmt --code $LASTEXITCODE '{path:cyan:s} {git:purple:s:on :} {ok:green}{fail:red} '
}

Environment Variable

All shells support using PRMT_FORMAT environment variable:

# Bash/Zsh
export PRMT_FORMAT="{path:cyan:r} {rust:red:m:v 🦀} {git:purple}"
PS1='$(prmt --code $?)\$ '

# Fish
set -x PRMT_FORMAT "{path:cyan:r} {python:yellow:m: 🐍} {git:purple}"

# PowerShell
$env:PRMT_FORMAT = "{path:cyan:r} {git:purple}"

Popular Prompts

Minimal

prmt '{path:cyan:s} {ok:green}{fail:red} '
# Output: projects ❯

Developer

prmt '{path:cyan} {git:purple} {rust:red:s: 🦀} {node:green:s: ⬢} {ok:green}{fail:red} '
# Output: ~/projects/prmt on main 🦀1.90 ⬢20.5 ❯

Identity (via env module)

prmt '{env::USER}@{env::HOSTNAME} {path:cyan:s} {git:purple} {ok:green}{fail:red} '
# Output: zenpie@workbox projects on main ❯

Compact with time

prmt '{time:dim:12h} {path:cyan:s} {git:purple:s} {ok:green}{fail:red} '
# Output: 02:30PM projects main ❯

Full featured with newline

prmt '{path:cyan} {git:purple} {python:yellow:m: 🐍} {time:dim}\n{ok:green}{fail:red} '
# Output: ~/ml-project on develop 🐍3.11 14:30
#         ❯

Status-focused

prmt '{path:cyan:s} {git:purple:s:on :} {ok:green:✓}{fail:red:✗} '
# Output (success): projects on main ✓
# Output (failure): projects on main ✗

With exit codes

prmt '{path:cyan} {git:purple} {ok:green:❯}{fail:red::code} '
# Output (success): ~/projects main ❯
# Output (failure): ~/projects main 127

Installation

# Install from crates.io
cargo install prmt

# Build from source (Rust 2024 edition required)
cargo build --release
cp target/release/prmt ~/.local/bin/

# Or install directly from source
cargo install --path .

# Verify installation
prmt --version

Usage Examples

# Simple format with defaults
prmt '{path} {rust} {git}'
# Output: ~/projects 1.89.0 master

# Format with types and styles
prmt '{path::a}'                  # /home/user/projects (absolute path)
prmt '{path::r}'                  # ~/projects (relative with ~)
prmt '{path::s}'                  # projects (short - last dir only)
prmt '{rust:red:s}'               # 1.89 in red (short version)
prmt '{rust:red:m:v:}'            # v1 in red (major version with prefix)
prmt '{path:cyan:s:[:]}'          # [projects] in cyan
prmt '{git:purple::on :}'         # on master in purple

# Simplified formats with omitted parts
prmt '{rust::::!}'                # 1.89.0! (default style/type, suffix only)
prmt '{rust:::v:}'                # v1.89.0 (default style/type, prefix only)
prmt '{path::::]}'                # ~/projects] (suffix only)
prmt '{git:::on :}'               # on master (prefix only)

# Add your own icons with prefix
prmt '{rust::: 🦀}'               # 🦀1.89.0 (default color)
prmt '{node:green:: ⬢}'           # ⬢20.5.0 in green
prmt '{python:yellow:: 🐍}'       # 🐍3.11.0 in yellow

# Or add spacing with suffix for better readability
prmt '{rust::: 🦀 }'              # 🦀 1.89.0 (space after icon)
prmt '{node:green:: ⬢ }'          # ⬢ 20.5.0 (space after icon)

# Using short format aliases
prmt '{path:cyan:s} {rust:red:m:v:}' # projects v1 (both in color)
prmt '{git::s:on :}'              # on master (short format with prefix)

# No style with type
prmt '{path::s}'                  # projects (no color, short)
prmt '{path::a}'                  # /home/user/projects (no color, absolute)
prmt '{rust::m:v}'                # v1 (no color, major with prefix)

# With exit code indicators (requires --code flag)
prmt --code $? '{path:cyan} {ok:green}{fail:red}'
# Output (success): ~/projects ❯ (green)
# Output (failure): ~/projects ❯ (red)

# Fast mode (no version detection)
prmt --no-version '{path:cyan} {rust:red} {node:green}'
# Output: ~/projects (only shows active modules, no versions)

# Custom symbols for ok/fail using type as symbol
prmt --code $? '{path} {ok::✓} {fail::✗}'
# Output (success): ~/projects ✓
# Output (failure): ~/projects ✗

# Show exit code on failure
prmt --code $? '{path} {ok::❯} {fail::code}'
# Output (success): ~/projects ❯
# Output (failure with code 127): ~/projects 127

# Time formats
prmt '{time}'                     # 14:30 (default 24h)
prmt '{time::24hs}'               # 14:30:45
prmt '{time::12h}'                # 02:30PM
prmt '{time::12hs}'               # 02:30:45PM
prmt '{path:cyan} {time:dim:12h}' # ~/projects 02:30PM (with styling)

Format Specification

Format Syntax

{module}                      - Default everything
{module:style}                - Custom style
{module:style:type}           - Custom style and type
{module:style:type:prefix}    - Add prefix to value
{module:style:type:prefix:postfix} - Add prefix and postfix

# Omitting parts (empty means default)
{module::::suffix}            - Default style/type, suffix only
{module:::prefix:}            - Default style/type, prefix only
{module:::prefix:suffix}      - Default style/type, both prefix/suffix
{module::type}                - No style, specific type
{module::type::suffix}        - No style, specific type, suffix only

Available Modules

Module	Detection	Description
path	Always active	Current directory with ~ for home
ok	Exit code = 0	Shows when last command succeeded (default: ❯)
fail	Exit code ≠ 0	Shows when last command failed (default: ❯)
git	.git directory	Branch name with status indicators
node	package.json	Node.js version
python	requirements.txt, pyproject.toml, etc	Python version
rust	Cargo.toml	Rust version
deno	deno.json, deno.jsonc	Deno version
bun	bun.lock, bun.lockb	Bun version
go	go.mod	Go version
elixir	mix.exs	Elixir version
env	Requested variable is set/non-empty	Value of a specific environment variable (format = name)
time	Always active	Current time in various formats
json	--stdin flag	Extract values from JSON piped via stdin (format = dot-path)

Type Values

Version modules (rust, node, python, etc.):

• full or f - Full version (1.89.0)
• short or s - Major.minor (1.89)
• major or m - Major only (1)

Path module:

• relative or r - Path with ~ for home directory (default)
• absolute, a, or f - Full absolute path without ~ substitution
• short or s - Last directory only

Git module:

• full or f - Branch with status (default)
• short or s - Branch name only
• Add +owned (or +o) to show only repos owned by the current user (e.g., {git::full+owned})

Ok/Fail modules:

• full - Default symbol (❯)
• code - Shows the actual exit code number
• Any other string - Uses that string as the symbol (e.g., {ok::✓} shows ✓)

Time module:

• 24h - 24-hour format HH:MM (default)
• 24hs or 24HS - 24-hour format with seconds HH:MM:SS
• 12h or 12H - 12-hour format hh:MMAM/PM
• 12hs or 12HS - 12-hour format with seconds hh:MM:SSAM/PM

Env module:

• The type field is required and must be the environment variable name (e.g., {env::USER} or {env:blue:PATH}).
• The module emits the variable value only when it exists and is non-empty; otherwise it returns nothing so the placeholder is effectively inactive.
• Example for identity: {env::USER}@{env::HOSTNAME}

Json module (requires --stdin):

• Reads JSON from stdin and extracts values using dot-path notation.
• The type field is the dot-path to the value (e.g., {json::.model.id} or {json::name}).
• Supports nested objects ({json::.a.b.c}), array indexing ({json::.items.0}), and the leading dot is optional.
• Strings are returned as-is, numbers and booleans are stringified, null and missing paths produce no output.
• When --stdin is not passed, json placeholders are silently inactive.

Claude Code status line -- pipe JSON context to prmt to display model and context window usage.

Add to your Claude Code settings.json:

{
  "statusLine": {
    "type": "command",
    "command": "prmt --stdin '{path:#89dceb}{node:#a6e3a1:f: [:]}{rust:#f38ba8:f: 🦀}{git:#f9e2af:f: 󰊢 } {json:#d97757:.model.id: :}{json:#f5c2e7:.context_window.used_percentage: :%}'",
    "padding": 0
  }
}

Type Validation

The format parser validates types at parse time to catch errors early:

# Valid types for each module
prmt '{path::short}'     # ✓ Valid
prmt '{rust::major}'     # ✓ Valid
prmt '{ok::✓}'          # ✓ Valid (custom symbol)
prmt '{fail::code}'     # ✓ Valid (shows exit code)

# Invalid types produce clear errors
prmt '{path::major}'
# Error: Invalid type 'major' for module 'path'. Valid types: relative, r, absolute, a, short, s

prmt '{git::major}'
# Error: Invalid type 'major' for module 'git'. Valid types: full, short

Default Module Styles

Module	Default Color	Can Override
path	cyan	Yes
ok	green	Yes
fail	red	Yes
git	purple	Yes
node	green	Yes
rust	red	Yes
python	yellow	Yes
go	cyan	Yes
deno	-	Yes
bun	-	Yes
time	-	Yes

Styles

Colors: black, red, green, yellow, blue, purple, cyan, white, #hexcode

Modifiers: bold, dim, italic, underline, reverse, strikethrough

Combine with dots: cyan.bold, red.dim.italic

Background colors: use fg+bg or +bg (background only), then modifiers. Examples: #ffffff+#333333, +blue, cyan+#222.dim

Escaping

• \{ → { (literal brace)
• \} → } (literal brace)
• \n → newline
• \t → tab
• \: → : (literal colon in fields)
• \\ → \ (literal backslash)

Performance

Actual Response Times

Scenario	Time	Notes
Path only	~0.01ms	Minimal prompt
Path + Git	~1-2ms	Branch and status
With Rust version	~25-30ms	Includes rustc --version
With --no-version	<5ms	Skips all version detection

Benchmark Snapshot

Scenario	Time (µs)	Notes
Minimal render	0.69	{path} only
Typical prompt	1.71	{path} {git} {ok}{fail}
Full prompt with versions	4.90	{path} {git} {rust} {node}
End-to-end (typical)	2.53	prmt binary execution

Measurements captured on an Intel Core i9-13900K host with project files on a SATA SSD (Rust 1.90.0 release build). Each value is the median of 100 cargo bench runs.

Why is it fast?

• Zero-copy parsing with SIMD optimizations
• Efficient memory allocation strategies
• Context-aware detection (only checks what's needed)
• No async operations or network calls
• Written in Rust for maximum performance

Command-Line Options

prmt [OPTIONS] [FORMAT]

OPTIONS:
    -n, --no-version        Skip version detection for speed
    -d, --debug             Show debug information and timing
    -b, --bench             Run benchmark (100 iterations)
        --stdin             Read JSON from stdin (enables json module)
        --code <CODE>       Exit code of the last command (for ok/fail modules)
        --no-color          Disable colored output
        --shell <SHELL>     Wrap ANSI escapes for the specified shell (bash, zsh, none)
    -h, --help              Print help
    -V, --version           Print version

ARGS:
    <FORMAT>           Format string (default from PRMT_FORMAT env var)

Building from Source

# Requirements: Rust 2024 edition
git clone https://github.com/3axap4eHko/prmt.git
cd prmt
cargo build --release

# Run tests
cargo test

# Benchmark
./target/release/prmt --bench '{path} {rust} {git}'

License

License The MIT License Copyright (c) 2025 Ivan Zakharchanka