calcmark

package module
v1.6.1 Latest Latest
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 Go to latest Published: Mar 7, 2026 License: MIT Imports: 6 Imported by: 0

README

CalcMark

Calculations embedded in markdown documents.

CalcMark TUI

CalcMark is a terminal-based calculation notepad. Write your thinking in plain text, add calculations that reference each other, and watch results update as you type.

Unlike spreadsheets, CalcMark files are human-readable, diffable, and live in your terminal.

Installation

macOS/Linux (Homebrew):

brew install calcmark/tap/calcmark

Download binary:

Platform Download
macOS (Apple Silicon) calcmark_VERSION_darwin_arm64.tar.gz
macOS (Intel) calcmark_VERSION_darwin_amd64.tar.gz
Linux (x64) calcmark_VERSION_linux_amd64.tar.gz
Linux (arm64) calcmark_VERSION_linux_arm64.tar.gz
Windows (x64) calcmark_VERSION_windows_amd64.zip

After downloading, extract and move cm to a directory in your PATH. On macOS, you may need to run xattr -d com.apple.quarantine ./cm before first use.

Quick Start

  1. Create a file called budget.cm:
# Monthly Budget

income = $5000
rent = $1500
savings_rate = 20%
savings = income * savings_rate
remaining = income - rent - savings
  1. Open in the TUI editor:
cm budget.cm
  1. Or evaluate from command line:
cm eval budget.cm
  1. Or convert to other formats:
cm convert budget.cm --to=html -o budget.html

CalcMark TUI

Examples

Explore example files to see CalcMark in action:

Run any example:

cm testdata/examples/budget.cm

Features

  • Variables flow downward - Define once, reference anywhere below
  • Units are first-class - 5 miles in km, 20 celsius in fahrenheit
  • Currencies - $100, 50 EUR, automatic formatting
  • Percentages - savings_rate = 20%, then income * savings_rate
  • Functions - avg(), sqrt(), capacity(), and more
  • YAML front matter - Define document-level constants
  • Export formats - Convert to HTML, Markdown, JSON, or plain text

Help Commands

cm help              # General help
cm help functions    # List all functions with descriptions
cm help constants    # List built-in constants
cm convert --help    # Export format options

Press Ctrl+H (or F1) in the TUI editor for keybindings.

Learn More

Development

Prerequisites:

  • Go 1.24+
  • Task — task runner (brew install go-task)

Optional (for recording demo GIFs):

  • VHS — terminal recorder (brew install vhs)
  • VHS requires ttyd and ffmpeg, installed automatically by Homebrew
task test       # Run all tests
task quality    # Lint, vet, staticcheck
task build      # Build the cm binary
task record-demos  # Regenerate all demo GIFs (requires VHS)

License

MIT

Documentation

Overview

Package calcmark provides a clean, idiomatic Go API for evaluating CalcMark expressions and documents.

CalcMark is a calculation-oriented markup language that combines markdown with inline calculations.

Basic usage: 

result, err := calcmark.Eval("1 + 1")
if err != nil {
    log.Fatal(err)
}
fmt.Println(result.Value) // 2

Stateful sessions (for live editors): 

session := calcmark.NewSession()
session.Eval("x = 10")
result, _ := session.Eval("x + 5")
fmt.Println(result.Value) // 15

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Diagnostic 

type Diagnostic struct {
	Severity Severity
	Code     string
	Message  string
}

Diagnostic represents a semantic issue (error, warning, or hint).

type Result 

type Result struct {
	// Value is the final computed value (for single expressions).
	// For multi-line documents, this is the last value.
	Value types.Type

	// AllValues contains all computed values (for multi-line documents).
	AllValues []types.Type

	// Diagnostics contains any errors, warnings, or hints from semantic analysis.
	Diagnostics []Diagnostic
}

Result contains the evaluation results and any diagnostics.

func Eval 

func Eval(input string) (*Result, error)

Eval evaluates a CalcMark expression or document and returns the result. For single-line expressions, returns the computed value. For multi-line documents, returns per-line results.

Example: 

result, err := calcmark.Eval("100 + 20")
if err != nil {
    log.Fatal(err)
}
fmt.Println(result.Value) // 120

type Session 

type Session struct {
	// contains filtered or unexported fields
}

Session maintains state for live editor use. Variables persist across Eval calls within the same session.

func NewSession 

func NewSession() *Session

NewSession creates a new stateful evaluation session. Variables are preserved across Eval calls.

Example: 

session := calcmark.NewSession()
session.Eval("x = 10")
result, _ := session.Eval("x + 5")
fmt.Println(result.Value) // 15

func (*Session) Eval 

func (s *Session) Eval(input string) (*Result, error)

Eval evaluates an expression in this session's context. Variables are preserved across calls.

func (*Session) GetVariable 

func (s *Session) GetVariable(name string) (any, bool)

GetVariable retrieves a variable value by name. Returns the value and true if found, nil and false otherwise.

func (*Session) Reset 

func (s *Session) Reset()

Reset clears all variables in this session.

type Severity 

type Severity int

Severity indicates the severity level of a diagnostic. 

const (
	// Error indicates a blocking error that prevents interpretation.
	Error Severity = iota
	// Warning indicates a potential issue that doesn't block interpretation.
	Warning
	// Hint indicates a suggestion for improvement.
	Hint
)

func (Severity) String 

func (s Severity) String() string

Source Files

View all Source files

Directories

Path Synopsis
cmd
calcmark command
calcmark/cmd
calcmark/config
Package config provides configuration management for the CalcMark TUI/CLI.
 Package config provides configuration management for the CalcMark TUI/CLI.
calcmark/config/theme
calcmark/filecheck
Package filecheck validates that file content is safe to interpret as CalcMark.
 Package filecheck validates that file content is safe to interpret as CalcMark.
calcmark/tui
calcmark/tui/components
calcmark/tui/editor
Package editor provides the TUI editor for CalcMark documents.
 Package editor provides the TUI editor for CalcMark documents.
calcmark/tui/editor/store
Package store defines the interface for remote document storage backends.
 Package store defines the interface for remote document storage backends.
calcmark/tui/geometry
Package geometry provides pure layout computation for two-column terminal rendering.
 Package geometry provides pure layout computation for two-column terminal rendering.
calcmark/tui/repl
calcmark/tui/shared
doceval command
Command doceval scans Hugo markdown files for ```calcmark code blocks, evaluates each through the CalcMark interpreter, and writes the results to site/data/cm_results.json.
 Command doceval scans Hugo markdown files for ```calcmark code blocks, evaluates each through the CalcMark interpreter, and writes the results to site/data/cm_results.json.
docgen command
Command docgen generates site/data/features.json from the features registry.
 Command docgen generates site/data/features.json from the features registry.
Package constants provides common constants used throughout go-calcmark
 Package constants provides common constants used throughout go-calcmark
display
Package display provides human-readable formatting for CalcMark types.
 Package display provides human-readable formatting for CalcMark types.
impl
cmd/calcmark command
document
interpreter
Package interpreter provides the CalcMark expression interpreter.
 Package interpreter provides the CalcMark expression interpreter.
types
Package types defines the CalcMark type system
 Package types defines the CalcMark type system
spec
ast
Package ast defines the Abstract Syntax Tree node types for CalcMark
 Package ast defines the Abstract Syntax Tree node types for CalcMark
classifier
Package classifier implements line classification for CalcMark
 Package classifier implements line classification for CalcMark
document
Package document defines the CalcMark document structure with blocks.
 Package document defines the CalcMark document structure with blocks.
features
Package features provides a searchable catalog of CalcMark features for help systems, autocompletion, and documentation generation.
 Package features provides a searchable catalog of CalcMark features for help systems, autocompletion, and documentation generation.
identifiers
Package identifiers provides the canonical set of named values accepted by CalcMark functions.
 Package identifiers provides the canonical set of named values accepted by CalcMark functions.
lexer
Package lexer implements the CalcMark lexer/tokenizer.
 Package lexer implements the CalcMark lexer/tokenizer.
parser
Package parser provides the CalcMark parser implementation.
 Package parser provides the CalcMark parser implementation.
semantic
Package semantic provides semantic analysis for CalcMark programs.
 Package semantic provides semantic analysis for CalcMark programs.
types
Package types defines the CalcMark type system.
 Package types defines the CalcMark type system.
units
Package units provides canonical unit name mappings based on UCUM and NIST standards.
 Package units provides canonical unit name mappings based on UCUM and NIST standards.

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