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! 🎉

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

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'

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)

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

# 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::git}'                # projects/src (relative to Git repository parent)
prmt '{path::i}'                  # ~/p/projects (parent initials, last segment preserved)
prmt '{path::u}'                  # ~/prjcts (interior vowels stripped)
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

Each module may appear once per template. The parameterized env and json modules may appear multiple times because each occurrence can request a different value.

Available Modules

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)
• git - Path from the Git repository directory, falling back to relative outside a repository
• absolute, a, or f - Full absolute path without ~ substitution
• initials or i - Parent segments shortened to their first character; last segment kept full (hidden dirs keep the leading .)
• unvowel or u - Interior vowels stripped from each segment; first character kept; segments ≤ 3 chars unchanged
• 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 '{path::initials}'  # ✓ Valid
prmt '{path::unvowel}'   # ✓ 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, git, absolute, a, f, initials, i, unvowel, u, short, s

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

Default Module Styles

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

Benchmark Snapshot

Measurements captured on an Intel Core i9-13900K host with project files on a SATA SSD (Rust 1.96.0 release build). Each value is the median of 100 cargo bench samples.

Prompt Timeout

Prompt timeout is disabled by default. If you enable it, modules that do not finish before the timeout show ... instead of blocking the prompt. This is a latency tradeoff for slow filesystems like network drives, WSL2 /mnt/c/, or NFS mounts.

Benchmark mode ignores this setting so --bench measures the actual module work instead of the timeout fallback.

# Adjust timeout (milliseconds)
prmt --timeout 30 '{path} {git}'    # 30ms prompt timeout
prmt --timeout 0 '{path} {git}'     # disable timeout

# Or set via environment variable
export PRMT_TIMEOUT=50

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
    -t, --timeout <MS>      Prompt timeout in ms (default 0, disabled)
    -d, --debug             Show debug information and timing
    -b, --bench             Run benchmark (100 iterations, ignores prompt timeout)
        --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)

ENVIRONMENT:
    PRMT_FORMAT             Default format string
    PRMT_TIMEOUT            Prompt timeout in ms (overridden by --timeout)

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