Class: Hammer

Inherits:
Object
  • Object
show all
Includes:
Shell
Defined in:
lib/lux-hammer.rb,
lib/hammer/shell.rb,
lib/hammer/dotenv.rb,
lib/hammer/loader.rb,
lib/hammer/option.rb,
lib/hammer/parser.rb,
lib/hammer/recipe.rb,
lib/hammer/builder.rb,
lib/hammer/command.rb,
lib/hammer/builtins.rb,
lib/hammer/command_builder.rb

Overview

Thor-inspired tiny CLI builder.

Class DSL:

class MyCli < Hammer
  task :build do
    desc    'Build the project'
    example 'build -v --env=prod'
    opt :verbose, type: :boolean, alias: :v
    opt :env,     type: :string,  default: 'dev'
    proc do |opts|
      say.green "building #{opts[:env]} args=#{opts[:args].inspect}"
    end
  end
end

MyCli.start(ARGV)

Block DSL is identical, just inside ‘Hammer.run`:

Hammer.run(ARGV) do
  task :hello do
    desc 'Greet someone'
    opt :loud, type: :boolean, alias: :l
    proc do |opts|
      msg = "hello #{opts[:args].first || 'world'}"
      msg = msg.upcase if opts[:loud]
      say msg, :cyan
    end
  end
end

Defined Under Namespace

Modules: Builtins, DSL, Dotenv, Recipe, Shell Classes: Builder, Command, CommandBuilder, Loader, Option, Parser

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Shell

ask, choose, choose_numbered, color!, color?, error, paint, print_error, say, sh, yes?

Class Method Details

.alt(*names) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 81

def alt(*names)      ; @pending_alts.concat(names) end

.ancestor_chain ⇒ Object

Root -> … -> self. Used to gather ‘before` hooks for a command.



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# File 'lib/lux-hammer.rb', line 287

def ancestor_chain
  chain = []
  klass = self
  while klass
    chain.unshift klass
    klass = klass.parent
  end
  chain
end

.app_desc(text = nil) ⇒ Object

Top-level description for the whole CLI. Set from a Hammerfile (block DSL) via ‘desc ’text’‘ at top level - see `Hammer::Builder#desc`. Rendered under the Usage line in `–help` output.



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# File 'lib/lux-hammer.rb', line 119

def app_desc(text = nil)
  return @app_desc if text.nil?
  @app_desc = text.to_s.rstrip
end

.app_local_location?(loc) ⇒ Boolean

True when a captured location lives inside the main app. relativize_path rewrites in-app absolute paths to a ‘.`-relative form, so anything still starting with “/” is an absolute path outside cwd - a framework, plugin, or gem file. Relative locations are already cwd-anchored, hence local.

Returns:

  • (Boolean) 


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# File 'lib/lux-hammer.rb', line 275

def app_local_location?(loc)
  !loc.to_s.start_with?('/')
end

.before(&block) ⇒ Object

Register a hook to run before every command in this class (root or namespace). Hooks receive the command’s ‘opts` hash. All hooks run outer -> inner, once per top-level `start` (prereqs don’t re-trigger).

before { |opts| Dotenv.load }
namespace :db do
  before { hammer :env }
  task :migrate do ... end
end



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# File 'lib/lux-hammer.rb', line 231

def before(&block)
  before_hooks << block
end

.before_hooks ⇒ Object 



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# File 'lib/lux-hammer.rb', line 235

def before_hooks
  @before_hooks
end

.cli(argv = ARGV) ⇒ Object

Entry point for the ‘hammer` binary. Walks up from CWD until it finds a Hammerfile, evaluates it as the block DSL, then dispatches ARGV against the resulting CLI.

‘–system` forces the no-Hammerfile branch even from inside a project - the escape hatch for reaching `recipes`/`init` when a user-defined task tree would otherwise own the root.



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# File 'lib/lux-hammer.rb', line 1013

def self.cli(argv = ARGV)
  argv = argv.dup
  force_system = !!argv.delete('--system')

  # Shebang invocation: `hammer /path/to/script ...args` (kernel passes
  # the script path as argv[0] for `#!/usr/bin/env hammer` files).
  # Treat the script as a self-contained CLI: no Hammerfile lookup, no
  # chdir (commands run in the caller's cwd), no `hammer`-binary
  # built-ins/banners. Detection requires a `#!`+`hammer` first line so
  # task names that happen to be paths don't get hijacked.
  if (script = shebang_script(argv.first))
    argv.shift
    return run_shebang(script, argv)
  end

  path = force_system ? nil : find_hammerfile(Dir.pwd)
  unless path
    # No Hammerfile (or --system) - all built-ins are reachable. Bare
    # `hammer`, `hammer recipes`, `hammer update`, `hammer agents`,
    # `hammer version`, `hammer init` all work.
    if force_system || dispatches_to_builtin?(argv) || looks_like_builtin?(argv)
      klass = Class.new(Hammer)
      klass.instance_variable_set(:@hammer_binary, true)
      klass.program_name
      require_relative 'hammer/builtins'
      Hammer::Builtins.register_core(klass)
      Hammer::Builtins.register_no_project(klass)
      klass.start(argv)
      return
    end

    Shell.print_error "no Hammerfile found in #{Dir.pwd} or any parent directory"

    # Heuristic: *.rb files referencing `Hammer.` are likely inline CLIs
    # the user could promote into a Hammerfile.
    excludes = %w[.git node_modules tmp vendor coverage dist build]
               .map { |d| "--exclude-dir=#{d}" }.join(' ')
    candidates = `grep -rl --include='*.rb' #{excludes} 'Hammer\\.' . 2>/dev/null`
                 .lines.map(&:strip).reject(&:empty?)
    unless candidates.empty?
      Shell.say "possible CLI implementation(s) - files referencing `Hammer.`:", :yellow
      candidates.first(10).each { |f| Shell.say "  #{f.sub(%r{\A\./}, '')}" }
      Shell.say ''
    end

    Shell.say "create one - example:"
    puts
    Shell.say STARTER_HAMMERFILE
    Shell.say ''
    bin = File.basename($PROGRAM_NAME)
    Shell.say "tip: run `#{bin} init` to drop the example above into ./Hammerfile", :gray
    Shell.say "tip: run `#{bin} agents` for AI-friendly Hammerfile authoring docs", :gray
    exit 1
  end

  klass = Class.new(Hammer)
  # Mark this class as the `hammer` binary's root so help output can
  # surface binary-only sections (`Recipes:` listing).
  klass.instance_variable_set(:@hammer_binary, true)
  # Resolve before chdir so paths like `bin/foo` stay relative to the
  # cwd the user actually invoked from. `program_name` memoizes.
  klass.program_name

  # chdir into the Hammerfile's directory for the entire run so commands
  # operate on the project root (Rake-style).
  Dir.chdir(File.dirname(path))
  Builder.new(klass).evaluate(File.read(path), path)
  # Auto-load `.env` / `.env.local` after eval so a top-level
  # `dotenv false` in the Hammerfile can suppress it. Trade-off: vars
  # are NOT visible during Hammerfile evaluation, only inside handlers.
  Hammer::Dotenv.load(Dir.pwd) if klass.dotenv_enabled?

  # Core built-ins register AFTER Hammerfile eval so user-defined
  # tasks win (the `unless commands.key?(...)` guards in register_core
  # skip the built-in when overridden - no redefinition warning).
  # `register_no_project` (:recipes, :init) is intentionally NOT
  # called here - those would clash too easily with user tasks. Use
  # `hammer --system recipes` to reach them from inside a project.
  require_relative 'hammer/builtins'
  Hammer::Builtins.register_core(klass)

  klass.start(argv)
end

.commands ⇒ Object 



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# File 'lib/lux-hammer.rb', line 304

def commands
  @commands ||= {}
end

.default_program_name ⇒ Object

Program name shown in help/usage: the invocation path relative to cwd if the script lives inside it (e.g. ‘bin/foo` when invoked from the project root), otherwise the basename (e.g. `lux` for a globally installed bin in PATH).



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# File 'lib/lux-hammer.rb', line 128

def default_program_name
  prog = $PROGRAM_NAME
  return File.basename(prog) unless prog.include?('/')
  # Resolve symlinks on both sides so e.g. macOS `/tmp` -> `/private/tmp`
  # doesn't cause a false miss when comparing prefixes.
  abs = File.realpath(prog) rescue File.expand_path(prog)
  cwd = File.realpath(Dir.pwd) rescue Dir.pwd
  return abs[(cwd.length + 1)..] if abs.start_with?("#{cwd}/")
  File.basename(prog)
end

.desc(text) ⇒ Object

—– class-level DSL for ‘def`-style commands ——————— Set pending metadata that the next `def` will consume.

class MyCli < Hammer
  desc 'Build'
  opt :env, default: 'dev'
  def build(opts)
    say "building #{opts[:env]}"
  end
end



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# File 'lib/lux-hammer.rb', line 78

def desc(text)       ; @pending_desc = text.to_s.rstrip end

.dispatches_to_builtin?(argv) ⇒ Boolean

True if argv goes through a built-in dispatch path (‘:default` or `:help`) - meaning bare `hammer`, leading-flag invocations like `hammer -h`, or explicit help requests. These don’t need a project Hammerfile to run.

Returns:

  • (Boolean) 


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# File 'lib/lux-hammer.rb', line 1128

def self.dispatches_to_builtin?(argv)
  return true if argv.empty?
  first = argv.first
  first == 'help' || first == '-h' || first == '--help' || first.start_with?('-')
end

.dotenv(flag = true) ⇒ Object

Toggle auto-loading of ‘.env` / `.env.local` for the `hammer` binary. Default is ON. Call `dotenv false` at the top of a Hammerfile to suppress. No-op for standalone `MyCli.start` - auto-load only fires from `Hammer.cli`.



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# File 'lib/lux-hammer.rb', line 243

def dotenv(flag = true)
  @dotenv_enabled = flag
end

.dotenv_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lux-hammer.rb', line 247

def dotenv_enabled?
  @dotenv_enabled != false
end

.each_command(prefix = nil, &block) ⇒ Object

Yield [full_colon_path, Command] for every command in this class and all nested namespaces.



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# File 'lib/lux-hammer.rb', line 558

def each_command(prefix = nil, &block)
  commands.each_value do |c|
    full = prefix ? "#{prefix}:#{c.name}" : c.name
    yield full, c
  end
  namespaces.each do |ns_name, sub|
    sub_prefix = prefix ? "#{prefix}:#{ns_name}" : ns_name
    sub.each_command(sub_prefix, &block)
  end
end

.emit_rows(rows, width) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 799

def emit_rows(rows, width)
  rows.each do |full, c|
    brief = c.alts.empty? ? c.brief : "#{c.brief} (alt: #{c.alts.join(', ')})"
    brief = "#{brief} #{Shell.paint('(redefined)', :yellow)}" if c.prev_location
    Shell.say "  #{program_name} #{full.ljust(width)}  # #{brief}"
  end
end

.example(text) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 79

def example(text)    ; @pending_examples << text end

.find_command(name) ⇒ Object

Find a command by canonical name or alt within this class. Falls back to fuzzy match (prefix first, then substring) when no exact hit. Raises AmbiguousMatch if the fuzzy pass matches more than one.



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# File 'lib/lux-hammer.rb', line 452

def find_command(name)
  name = name.to_s
  exact = commands[name] || commands.values.find { |c| c.matches?(name) }
  return exact if exact
  fuzzy_pick(name, commands.values, 'command') { |c| [c.name, *c.alts] }
end

.find_hammerfile(start) ⇒ Object

Walk up the directory tree looking for a Hammerfile.



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# File 'lib/lux-hammer.rb', line 1146

def self.find_hammerfile(start)
  dir = File.expand_path(start)
  loop do
    candidate = File.join(dir, 'Hammerfile')
    return candidate if File.file?(candidate)
    parent = File.dirname(dir)
    return nil if parent == dir
    dir = parent
  end
end

.find_namespace(name) ⇒ Object

Find a namespace by name within this class. Same fuzzy fallback as find_command.



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# File 'lib/lux-hammer.rb', line 461

def find_namespace(name)
  name = name.to_s
  return namespaces[name] if namespaces.key?(name)
  pair = fuzzy_pick(name, namespaces.to_a, 'namespace') { |p| [p.first] }
  pair&.last
end

.find_namespace_sibling(canonical) ⇒ Object

Returns the command at the parent that shares its name with this namespace. E.g. for path “gem:version” returns the ‘version` command in the `gem` namespace (if defined), so `gem:version:` listings can include `gem:version` itself at the top.



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# File 'lib/lux-hammer.rb', line 472

def find_namespace_sibling(canonical)
  parts = canonical.to_s.split(':')
  return nil if parts.empty?
  parent = self
  parts[0..-2].each do |seg|
    parent = parent.namespaces[seg] or return nil
  end
  parent.commands[parts.last]
end

.fuzzy_pick(name, items, kind, &keys_for) ⇒ Object

Shared fuzzy matcher used by find_command and find_namespace. The block returns the strings to match against for each item (canonical name plus alts for commands, just the key for namespaces). Tries prefix match first, then substring; raises AmbiguousMatch when either pass hits more than one item.



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# File 'lib/lux-hammer.rb', line 520

def fuzzy_pick(name, items, kind, &keys_for)
  [:start_with?, :include?].each do |op|
    matches = items.select { |item| keys_for.call(item).any? { |k| k.send(op, name) } }
    next if matches.empty?
    if matches.size > 1
      labels = matches.map { |m| keys_for.call(m).first }.sort
      raise AmbiguousMatch, "multiple #{kind}s match '#{name}': #{labels.join(', ')}"
    end
    return matches.first
  end
  nil
end

.hammer(name, *args, **opts) ⇒ Object

Programmatic dispatch by name. Useful for scripting and tests.

MyCli.hammer :build                       -> start(["build"])
MyCli.hammer 'db:users:list'              -> start(["db:users:list"])
MyCli.hammer :eval, 'puts 42'             -> start(["eval", "puts 42"])
MyCli.hammer :build, env: 'prod'          -> start(["build", "--env=prod"])
MyCli.hammer :build, verbose: true        -> start(["build", "--verbose"])
MyCli.hammer :build, no_cache: true       -> start(["build", "--no-cache"])
MyCli.hammer :build, cache: false         -> skipped (no-op)

Symbols are single-segment names; pass a string with colons for namespaced paths. Trailing positionals become positional ARGV. Underscores in option keys become dashes in flags.



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# File 'lib/lux-hammer.rb', line 546

def hammer(name, *args, **opts)
  argv = [name.to_s, *args.map(&:to_s)]
  opts.each do |k, v|
    next if v == false
    flag = "--#{k.to_s.tr('_', '-')}"
    argv << (v == true ? flag : "#{flag}=#{v}")
  end
  start(argv)
end

.inherited(sub) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 52

def inherited(sub)
  super
  sub.instance_variable_set(:@commands, {})
  sub.instance_variable_set(:@namespaces, {})
  sub.instance_variable_set(:@before_hooks, [])
  sub.instance_variable_set(:@parent, nil)
  sub.instance_variable_set(:@program_name, nil)
  sub.instance_variable_set(:@app_desc, nil)
  sub.instance_variable_set(:@pending_desc, nil)
  sub.instance_variable_set(:@pending_examples, [])
  sub.instance_variable_set(:@pending_options, [])
  sub.instance_variable_set(:@pending_alts, [])
  sub.instance_variable_set(:@pending_needs, [])
end

.load(*paths, **kwargs) ⇒ Object

Load Hammerfile fragments and register their commands on this class. Rake-style: split a CLI across multiple files.

load                        # auto-discover *_hammer.rb under caller dir
load auto: true             # same
load 'tasks/db_hammer.rb'   # one file
load 'tasks/*_hammer.rb'    # glob

Paths resolve relative to the file calling ‘load`. See `Hammer::Loader` for the full implementation.



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# File 'lib/lux-hammer.rb', line 340

def load(*paths, **kwargs)
  if self == Hammer
    raise Error, 'use `load` from inside a Hammerfile / Hammer.run block / Hammer subclass body, ' \
                 'or call SubClass.load - Hammer.load itself has no target'
  end
  anchor = Loader.caller_anchor(caller_locations(1, 1).first)
  loader.load(anchor, paths, kwargs)
end

.loader ⇒ Object

Per-target Loader instance. Owns the dedup cache, so re-entrant ‘load` from inside a fragment is safe and idempotent.



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# File 'lib/lux-hammer.rb', line 314

def loader
  @loader ||= Loader.new(self)
end

.looks_like_builtin?(argv) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lux-hammer.rb', line 1139

def self.looks_like_builtin?(argv)
  first = argv.first
  return false unless first
  BUILTIN_TASKS.include?(first) || BUILTIN_TASKS.any? { |t| first.start_with?("#{t}:") }
end

.method_added(method_name) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 84

def method_added(method_name)
  super
  return unless @pending_desc

  cmd = Command.new(name: method_name.to_s, desc: @pending_desc)
  @pending_examples.each { |e| cmd.add_example(e) }
  @pending_options.each  { |o| cmd.add_option(o) }
  @pending_alts.each     { |n| cmd.add_alt(n) }
  @pending_needs.each    { |n| cmd.add_need(n) }

  # If the method takes no args, call it without opts. Otherwise pass
  # opts. So both `def build` and `def build(opts)` work.
  m = method_name
  arity = instance_method(method_name).arity
  cmd.handler = arity.zero? ? proc { send(m) } : proc { |opts| send(m, opts) }
  cmd.finalize!
  commands[cmd.name] = cmd

  @pending_desc = nil
  @pending_examples = []
  @pending_options  = []
  @pending_alts     = []
  @pending_needs    = []
end

.namespace(name, &block) ⇒ Object

Open a namespace (group of commands). Everything inside the block (task, nested namespace, …) belongs to that namespace, evaluated against an anonymous Hammer subclass.

namespace :db do
  task :migrate do ... end
  namespace :users do ... end
end

Reopening a namespace merges: the same ‘namespace :db do … end` can be split across files (Rake-style) and the blocks accumulate onto one subclass. Only a duplicate task name inside warns - that’s handled by ‘task`. The namespace subclass is created lazily on first mention.



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# File 'lib/lux-hammer.rb', line 201

def namespace(name, &block)
  sub = (@namespaces[name.to_s] ||= begin
    ns = Class.new(Hammer)
    # Track the top-level CLI class so cross-invocation
    # (`hammer 'ns:cmd'`) from inside a namespaced command dispatches
    # against the full tree, not just the current namespace.
    ns.instance_variable_set(:@root, root)
    # Parent link, so `before` hooks defined further up the namespace
    # tree can be collected and run outer -> inner before a command.
    ns.instance_variable_set(:@parent, self)
    # Share the parent's resolved program_name so help banners show
    # "myapp ns:cmd" with the same prefix everywhere - and so the value
    # captured pre-chdir (see `Hammer.cli`) survives into nested classes.
    ns.instance_variable_set(:@program_name, program_name)
    ns.instance_variable_set(:@location, source_location_of(block))
    ns
  end)

  Hammer.with_target(sub) { sub.class_eval(&block) } if block
end

.namespaces ⇒ Object 



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# File 'lib/lux-hammer.rb', line 308

def namespaces
  @namespaces ||= {}
end

.needs(*names) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 82

def needs(*names)    ; @pending_needs.concat(names) end

.opt(name, **o) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 80

def opt(name, **o)   ; @pending_options << Option.new(name, **o) end

.parent ⇒ Object 



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# File 'lib/lux-hammer.rb', line 251

def parent
  @parent
end

.print_ai_help ⇒ Object

Dump the gem’s AGENTS.md to stdout - AI-optimized guide for writing Hammerfiles. Bundled with the gem and resolved relative to this file so it works from any install location.



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# File 'lib/lux-hammer.rb', line 927

def self.print_ai_help
  path = File.expand_path('../AGENTS.md', __dir__)
  if File.file?(path)
    puts File.read(path)
  else
    Shell.print_error "AGENTS.md not found at #{path}"
    exit 1
  end
end

.print_command_help(cmd, full = nil) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 839

def print_command_help(cmd, full = nil)
  full ||= cmd.name
  Shell.say "Usage: #{program_name} #{full}#{usage_signature(cmd)}", :cyan
  cmd.desc.each_line do |line|
    stripped = line.chomp
    Shell.say(stripped.empty? ? '' : "  #{stripped}")
  end unless cmd.desc.empty?
  Shell.say "  alias: #{cmd.alts.join(', ')}" unless cmd.alts.empty?
  unless cmd.options.empty?
    Shell.say ''
    Shell.say 'Options:', :yellow
    cmd.options.each { |o| Shell.say "  #{o.usage}" }
  end
  unless cmd.examples.empty?
    Shell.say ''
    Shell.say 'Examples:', :yellow
    cmd.examples.each { |e| Shell.say "  #{program_name} #{e}" }
  end
end

.print_command_list(klass, prefix = nil) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 771

def print_command_list(klass, prefix = nil)
  rows = []
  # Commands without a `desc` are hidden from listings but still
  # dispatchable + `hammer`-callable - useful for private helpers
  # invoked from `before` hooks or other commands (e.g. `:env`, `:app`).
  klass.each_command(prefix) { |full, c| rows << [full, c] unless c.desc.empty? }
  return if rows.empty?

  # group by "section" = everything between the view prefix and the
  # leaf name. Bare leaves go in :root.
  groups = rows.group_by { |full, _| section_for(full, prefix, klass) }
  width  = rows.map { |full, _| full.length }.max
  first  = true

  if (rooted = groups.delete(:root))
    Shell.say 'Commands:', :yellow
    emit_rows(rooted.sort_by { |full, _| [full.count(':'), full] }, width)
    first = false
  end

  groups.each do |section, items|
    Shell.say unless first
    first = false
    Shell.say "#{section}:", :yellow
    emit_rows(items.sort_by { |full, _| [full.count(':'), full] }, width)
  end
end

.print_extras ⇒ Object

Extras shown only in the extended (‘help` / `-h` / `–help`) view: global flags, GitHub footer, and a Hammerfile example for the `hammer` binary. The footer is skipped for the hammer binary because `print_top_banner` already surfaces the same link.



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# File 'lib/lux-hammer.rb', line 738

def print_extras
  hammer_bin = root.instance_variable_get(:@hammer_binary)
  print_global_flags
  print_hammerfile_example if hammer_bin
  print_footer unless hammer_bin
end

.print_footer ⇒ Object 



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# File 'lib/lux-hammer.rb', line 757

def print_footer
  Shell.say ''
  Shell.say "powered by hammer (v#{VERSION}) - #{HOMEPAGE}", :gray
end

.print_full_block(path, cmd) ⇒ Object

One “task block” for the expanded listing: blank line separator then the standard per-command help (usage + desc + options + examples).



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# File 'lib/lux-hammer.rb', line 717

def print_full_block(path, cmd)
  Shell.say ''
  print_command_help(cmd, path)
end

.print_global_flags ⇒ Object

Listed under ‘Default task options:` in `–help` so users see what flags fire on bare-flag invocation (`hammer –version` etc). Re-rendered from the live `:default` task so user-defined overrides surface their own flags here automatically.



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# File 'lib/lux-hammer.rb', line 749

def print_global_flags
  default = root.commands['default']
  return unless default && !default.options.empty?
  Shell.say ''
  Shell.say 'Default task options:', :yellow
  default.options.each { |o| Shell.say "  #{o.usage}" }
end

.print_hammerfile_example ⇒ Object

Hammerfile cheat-sheet shown under ‘hammer –help`. Same content as `hammer –init` writes - single source of truth via `Hammer::STARTER_HAMMERFILE`. For exhaustive docs see `hammer agents`.



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# File 'lib/lux-hammer.rb', line 765

def print_hammerfile_example
  Shell.say ''
  Shell.say 'Hammerfile example:', :yellow
  Shell.say Hammer::STARTER_HAMMERFILE
end

.print_help(target = nil, expanded: false, extended: false) ⇒ Object

‘extended: true` is the verbose `help` / `-h` / `–help` form - appends global flags, the GitHub footer, and (for the hammer binary) a Hammerfile example. Bare invocation passes `extended: false` so the no-args output stays a clean command listing.



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# File 'lib/lux-hammer.rb', line 644

def print_help(target = nil, expanded: false, extended: false)
  if target
    # `help ns:` is equivalent to `ns:` - namespace listing.
    if target.end_with?(':') && target != ':'
      bare = target.chomp(':')
      ns, canonical = resolve_namespace(bare)
      return print_namespace_help(canonical, ns) if ns
      Shell.print_error("unknown: #{target}")
      return
    end
    cmd, _, canonical = resolve(target)
    return print_command_help(cmd, canonical) if cmd
    ns, canonical = resolve_namespace(target)
    return print_namespace_help(canonical, ns, expanded: expanded) if ns
    Shell.print_error("unknown: #{target}")
    return
  end

  print_top_banner
  Shell.say "Usage: #{program_name} COMMAND [ARGS]", :cyan
  if @app_desc && !@app_desc.empty?
    Shell.say ''
    @app_desc.each_line { |l| Shell.say "  #{l.chomp}" }
  end
  if expanded
    each_command { |path, c| print_full_block(path, c) unless c.desc.empty? }
  else
    Shell.say ''
    print_command_list(self)
  end
  print_recipes_section if extended && root.instance_variable_get(:@hammer_binary)
  print_extras if extended
end

.print_namespace_help(prefix, ns, expanded: false, extended: false) ⇒ Object

‘extended:` is accepted for parity with `print_help` but intentionally not used here - the global-flags / Hammerfile-example / footer block is root-help-only. `expanded:` is also accepted for parity; a namespace listing is always the compact command list.



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# File 'lib/lux-hammer.rb', line 701

def print_namespace_help(prefix, ns, expanded: false, extended: false)
  Shell.say "Usage: #{program_name} #{prefix}:COMMAND [ARGS]", :cyan
  rows = []
  sibling = find_namespace_sibling(prefix)
  rows << [prefix, sibling] if sibling && !sibling.desc.empty?
  ns.each_command(prefix) { |path, c| rows << [path, c] unless c.desc.empty? }
  unless rows.empty?
    Shell.say ''
    Shell.say 'Commands:', :yellow
    width = rows.map { |path, _| path.length }.max
    emit_rows(rows.sort_by { |path, _| [path.count(':'), path] }, width)
  end
end

.print_recipes_section ⇒ Object

Lists recipes (gem + user-dir) under their own section in ‘hammer –help`. Each row shows the recipe’s ‘# desc:` line and either an install hint or the path of the existing stub on PATH. Only rendered when this CLI is the `hammer` binary’s root.



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# File 'lib/lux-hammer.rb', line 682

def print_recipes_section
  entries = Hammer::Recipe.all
  return if entries.empty?
  Shell.say ''
  Shell.say 'Recipes:', :yellow
  width = entries.keys.map(&:length).max
  entries.each do |name, file|
    desc = Hammer::Recipe.desc(file)
    installed = Hammer::Recipe.installed_path(name)
    suffix = installed ? "(installed: #{installed})" : "[install: #{program_name} recipes --install #{name}]"
    Shell.say "  #{name.ljust(width)}  # #{desc}"
    Shell.say "  #{' ' * width}    #{suffix}", :gray
  end
end

.print_run_banner(cmd, full, positional, opts) ⇒ Object

Print a gray “> prog cmd –opt=val ARG” banner before a command runs. Helps see what was actually picked when fuzzy matching resolved a partial name. Only opts that differ from their default are shown; booleans render as ‘–flag` / `–no-flag`.



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# File 'lib/lux-hammer.rb', line 596

def print_run_banner(cmd, full, positional, opts)
  parts = ["#{program_name} #{full}"]
  cmd.options.each do |o|
    val = opts[o.name]
    next if val.nil? || val == o.default
    if o.boolean?
      parts << (val ? "--#{o.name}" : "--no-#{o.name}")
    else
      parts << "--#{o.name}=#{val}"
    end
  end
  parts.concat(positional)
  Shell.say "> #{parts.join(' ')}", :gray
end

.print_top_banner ⇒ Object

Gray “lux-hammer X.Y.Z - <homepage>” line shown above top-level help in both bare-invocation and ‘–help` modes, so the link is always one glance away. User CLIs skip it (the lux-hammer name/link is irrelevant outside the `hammer` binary).



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# File 'lib/lux-hammer.rb', line 728

def print_top_banner
  return unless root.instance_variable_get(:@hammer_binary)
  Shell.say "lux-hammer #{VERSION} - #{HOMEPAGE}", :gray
  Shell.say ''
end

.program_name ⇒ Object

Resolved lazily on first read and memoized, so callers that need the cwd-relative form (see ‘default_program_name`) can warm the cache before chdir-ing elsewhere.



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# File 'lib/lux-hammer.rb', line 112

def program_name
  @program_name ||= default_program_name
end

.recipe(name, argv = ARGV) ⇒ Object

Entry point for recipe stubs in PATH. A recipe is a standalone Hammerfile-style script bundled with the gem (or in ~/.config/hammer/recipes/) that is exposed as its own bin via a tiny Ruby wrapper containing:

require 'lux-hammer'
Hammer.recipe(:srt, ARGV)

The recipe runs as a self-contained CLI: program_name is the recipe name, only its own tasks show in –help, no global hammer commands appear. Runs in the caller’s cwd (no chdir, no Hammerfile lookup).



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# File 'lib/lux-hammer.rb', line 908

def self.recipe(name, argv = ARGV)
  path = Recipe.path(name)
  unless path
    Shell.print_error "unknown recipe: #{name}"
    Shell.say 'available recipes:', :yellow
    Recipe.all.keys.sort.each { |n| Shell.say "  #{n}" }
    Shell.say 'try `hammer recipes` to list with descriptions', :gray
    exit 1
  end

  klass = Class.new(Hammer)
  klass.instance_variable_set(:@program_name, name.to_s)
  Builder.new(klass).evaluate(File.read(path), path)
  klass.start(argv)
end

.relativize_path(path) ⇒ Object

Trim the cwd prefix off an absolute path so redefinition warnings read as ‘./lib/tasks/foo.rb` instead of a long absolute path. Paths outside cwd (framework / gem files) are left absolute.



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# File 'lib/lux-hammer.rb', line 266

def relativize_path(path)
  prefix = "#{Dir.pwd}/"
  path.start_with?(prefix) ? ".#{path[Dir.pwd.length..]}" : path
end

.resolve(path) ⇒ Object

Walk “ns1:ns2:cmd” -> [command, owning_class, canonical_path]. Returns [nil, nil, nil] if any segment is missing or the final segment isn’t a command. canonical_path uses the canonical name of every segment (so a fuzzy ‘b` resolves to `build` in the path).



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# File 'lib/lux-hammer.rb', line 486

def resolve(path)
  parts = path.to_s.split(':')
  klass = self
  canonical = []
  parts[0..-2].each do |ns|
    sub = klass.find_namespace(ns) or return [nil, nil, nil]
    canonical << klass.namespaces.key(sub)
    klass = sub
  end
  cmd = klass.find_command(parts.last)
  return [nil, nil, nil] unless cmd
  canonical << cmd.name
  [cmd, klass, canonical.join(':')]
end

.resolve_namespace(path) ⇒ Object

Walk “ns1:ns2” -> [namespace_class, canonical_path]. Returns [nil, nil] if any segment is missing.



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# File 'lib/lux-hammer.rb', line 503

def resolve_namespace(path)
  parts = path.to_s.split(':')
  klass = self
  canonical = []
  parts.each do |ns|
    sub = klass.find_namespace(ns) or return [nil, nil]
    canonical << klass.namespaces.key(sub)
    klass = sub
  end
  [klass, canonical.join(':')]
end

.root ⇒ Object

Topmost class in this CLI tree. For user-defined ‘class MyCli < Hammer` or `Class.new(Hammer)` it’s self; for namespace subclasses it’s whichever class opened the namespace.



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# File 'lib/lux-hammer.rb', line 300

def root
  @root || self
end

.run(argv = ARGV, &block) ⇒ Object

Define and run a CLI inline. Inside the block use ‘task :name do … end`, `namespace`, and `load`.

Without a block: load ./Hammerfile if it exists, otherwise auto-discover *_hammer.rb under Dir.pwd, then dispatch ARGV.



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# File 'lib/lux-hammer.rb', line 882

def self.run(argv = ARGV, &block)
  klass = Class.new(Hammer)
  if block
    Builder.new(klass).evaluate(&block)
  else
    hf = File.join(Dir.pwd, 'Hammerfile')
    if File.file?(hf)
      Builder.new(klass).evaluate(File.read(hf), hf)
    else
      klass.loader.load(Dir.pwd, [], auto: true)
    end
  end
  klass.start(argv)
end

.run_before_hooks(instance, opts) ⇒ Object

Fire ‘before` hooks from root down through the namespace chain. Each class’s hooks fire at most once per top-level ‘start`, so prereqs dispatched via `needs` won’t re-trigger them.



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# File 'lib/lux-hammer.rb', line 614

def run_before_hooks(instance, opts)
  ran = Thread.current[:hammer_before_ran] ||= {}
  ancestor_chain.each do |klass|
    next if ran[klass.object_id]
    ran[klass.object_id] = true
    klass.before_hooks.each { |hook| instance.instance_exec(opts, &hook) }
  end
end

.run_command(cmd, argv, full: nil, quiet: false) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 569

def run_command(cmd, argv, full: nil, quiet: false)
  # -h / --help is reserved on every command. Anywhere before a `--`
  # stop-marker, it short-circuits to per-command help.
  return print_command_help(cmd, full) if help_requested?(argv)

  positional, opts = Parser.new(cmd.options).parse(argv)
  opts[:args] = positional
  print_run_banner(cmd, full || cmd.name, positional, opts) unless quiet || ENV['HAMMER_QUIET']
  instance = new
  run_before_hooks(instance, opts)
  run_needs(cmd)
  instance.instance_exec(opts, &cmd.handler)
rescue Parser::Error => e
  Shell.print_error(e.message)
  print_command_help(cmd, full)
  exit 1
rescue Hammer::Error => e
  # Raised by `error 'msg'` inside a handler - controlled exit, no
  # backtrace, no per-command help spam.
  Shell.print_error(e.message)
  exit 1
end

.run_needs(cmd) ⇒ Object

Dispatch a command’s declared ‘needs` through the root class, with per-invocation dedupe. Prereqs run with default options (no argv).



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# File 'lib/lux-hammer.rb', line 625

def run_needs(cmd)
  return if cmd.needs.empty?
  ran = Thread.current[:hammer_needs_ran] ||= {}
  cmd.needs.each do |path|
    key = path.to_s
    next if ran[key]
    ran[key] = true
    target, = root.resolve(key)
    raise Error, "needs: unknown command '#{key}' in #{cmd.name}" unless target
    root.start([key])
  end
end

.run_or_exit(*cmd, **opts) ⇒ Object 



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# File 'lib/lux-hammer.rb', line 1000

def self.run_or_exit(*cmd, **opts)
  return if system(*cmd, **opts)
  Shell.print_error "command failed: #{cmd.join(' ')}"
  exit 1
end

.run_shebang(path, argv) ⇒ Object

Evaluate a shebang script as a self-contained CLI. Mirrors ‘recipe` semantics: no chdir, no `@hammer_binary` flag, no `register_core` built-ins (so the script’s ‘–help` shows only what it defines). `program_name` is the script’s basename so help reads “myscript foo” rather than “hammer foo” - works even when invoked via a symlink in PATH, since argv is the path the user typed.



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# File 'lib/lux-hammer.rb', line 1117

def self.run_shebang(path, argv)
  klass = Class.new(Hammer)
  klass.instance_variable_set(:@program_name, File.basename(path))
  Builder.new(klass).evaluate(File.read(path), path)
  klass.start(argv)
end

.section_for(full, prefix, klass = nil) ⇒ Object

‘db’ for ‘db:migrate’ or ‘db:users:list’ viewed from root; ‘users’ for ‘db:users:list’ viewed from ‘db’; :root if the command sits at the view’s top level. Only the first segment under the view groups, so deeper paths fold into their top-level section.

Exception: a bare command that shares its name with a sibling namespace (e.g. ‘mount` alongside a `mount:` namespace) groups under that namespace’s section, not :root.



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# File 'lib/lux-hammer.rb', line 815

def section_for(full, prefix, klass = nil)
  segs = full.split(':')
  segs = segs[prefix.split(':').size..] || [] if prefix && !prefix.empty?
  if segs.size == 1 && klass && klass.namespaces.key?(segs.first)
    return segs.first
  end
  parent = segs[0..-2]
  parent.empty? ? :root : parent.first
end

.self_update ⇒ Object

‘hammer update`: pull main in the install-script checkout and reinstall the gem. Assumes the install.sh layout - if the dir is missing, point the user at the curl-pipe installer.



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# File 'lib/lux-hammer.rb', line 978

def self.self_update
  dir = ENV['LUX_HAMMER_DIR'] || SELF_UPDATE_DIR
  unless File.directory?(File.join(dir, '.git'))
    Shell.print_error "no lux-hammer git checkout at #{dir}"
    Shell.say 'reinstall with:', :yellow
    Shell.say "  curl -fsSL #{SELF_INSTALL_URL} | bash"
    exit 1
  end

  Shell.say "* updating lux-hammer at #{dir}", :cyan
  Dir.chdir(dir) do
    run_or_exit('git', 'fetch', '--quiet', 'origin', 'main')
    run_or_exit('git', 'reset', '--quiet', '--hard', 'origin/main')
    version = File.read('.version').strip
    gem_file = "lux-hammer-#{version}.gem"
    run_or_exit('gem', 'build', 'lux-hammer.gemspec', out: File::NULL)
    run_or_exit('gem', 'install', '--quiet', gem_file)
    File.unlink(gem_file) if File.exist?(gem_file)
    Shell.say "* lux-hammer #{version} installed", :green
  end
end

.shebang_script(arg) ⇒ Object

Returns the script path if ‘arg` looks like a shebang script that delegates to hammer (first line starts with `#!` and mentions `hammer`). Returns nil otherwise. Used by `cli` to detect `#!/usr/bin/env hammer` invocations where the kernel passes the script path as argv.



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# File 'lib/lux-hammer.rb', line 1102

def self.shebang_script(arg)
  return nil unless arg
  return nil if arg.start_with?('-')
  return nil unless File.file?(arg) && File.readable?(arg)
  head = File.open(arg, &:gets).to_s
  return nil unless head.start_with?('#!') && head.include?('hammer')
  arg
end

.source_location_of(block) ⇒ Object

“file:line” of the block that defined a task/namespace. Falls back to “(unknown)” for blocks without a usable source_location (rare - built-in C-defined procs, eval’d blocks).



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# File 'lib/lux-hammer.rb', line 258

def source_location_of(block)
  loc = block&.source_location
  loc ? "#{relativize_path(loc[0])}:#{loc[1]}" : '(unknown)'
end

.start(argv = ARGV) ⇒ Object

Entry point. Parses ARGV, finds the right command, runs it. Command names are Rake-style colon paths: “build”, “db:migrate”, “db:users:list”.

Rake-style chained dispatch: ‘hammer build + deploy + notify`. A bare `+` argv token separates commands; `++` escapes to a literal `+` positional. Quoted shell args (`–foo=“a + b”`) arrive as a single token and are not split.



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# File 'lib/lux-hammer.rb', line 357

def start(argv = ARGV)
  # Track prereqs fired during this top-level invocation so a `needs`
  # chain runs each prereq at most once. Nested `start` calls (e.g.
  # `needs` -> `hammer` -> `start`, or a `+` chain) share the set;
  # the outermost call owns its lifetime.
  outer = Thread.current[:hammer_needs_ran].nil?
  Thread.current[:hammer_needs_ran] ||= {}
  Thread.current[:hammer_before_ran] ||= {}

  split_chain(argv).each { |seg| dispatch(seg) }
ensure
  Thread.current[:hammer_needs_ran] = nil if outer
  Thread.current[:hammer_before_ran] = nil if outer
end

.task(name, &block) ⇒ Object

Define a command. Block runs in a CommandBuilder context and must return a Proc as its last expression. That proc is the handler and receives a single ‘opts` hash with symbol keys; positional ARGV lives at `opts`.



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# File 'lib/lux-hammer.rb', line 143

def task(name, &block)
  cmd = Command.new(name: name.to_s)
  cmd.location = source_location_of(block)
  handler = CommandBuilder.new(cmd).instance_eval(&block)
  unless handler.is_a?(Proc)
    raise Error, <<~MSG
      task(:#{name}) block must end with a `proc do |opts| ... end`.
      The proc's return value is what becomes the command handler.

      Example:

        task :#{name} do
          desc    'what it does'
          example '#{name} foo --env=prod'
          opt :env, default: 'dev'

          proc do |opts|
            # your code here - opts[:env], opts[:args], ...
          end
        end
    MSG
  end
  cmd.handler = handler

  # Only warn when overriding a task that was also defined inside the
  # main app. Overriding one that came from outside - a framework
  # default, plugin, or gem - is an intentional override, so stay quiet
  # and don't tag it `(redefined)` in help.
  if (prev = commands[cmd.name]) && app_local_location?(prev.location)
    cmd.prev_location = prev.location
    warn_redefinition('task', cmd.name, prev.location, cmd.location)
  end

  cmd.finalize!
  commands[cmd.name] = cmd

  # `task` ignores pending class-level state, but clear it so a
  # later `def` doesn't accidentally consume stale metadata.
  @pending_desc = nil
  @pending_examples = []
  @pending_options  = []
  @pending_alts     = []
  @pending_needs    = []
end

.usage_signature(cmd) ⇒ Object

“ URL [ENV] [OPTIONS]” - shows the positional-fill names for declared non-boolean opts (required bare, optional bracketed), plus a generic [OPTIONS] tail if any flags exist.



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# File 'lib/lux-hammer.rb', line 828

def usage_signature(cmd)
  pos = cmd.options.reject(&:boolean?).map { |o|
    name = o.name.to_s.upcase
    o.required ? name : "[#{name}]"
  }
  out = pos.join(' ')
  out = "#{out} ".lstrip unless out.empty?
  out += '[OPTIONS]' unless cmd.options.empty?
  out.empty? ? '' : " #{out}"
end

.warn_redefinition(kind, name, prev_loc, new_loc) ⇒ Object

Emit a yellow [hammer] warning on stderr when a task/namespace is redefined. Last write wins (commands = cmd), but the prior location is captured so listings can tag the entry as ‘(redefined)`.



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# File 'lib/lux-hammer.rb', line 282

def warn_redefinition(kind, name, prev_loc, new_loc)
  warn Shell.paint("[hammer] redefined #{kind} :#{name} - was #{prev_loc || '(unknown)'}, now #{new_loc || '(unknown)'}", :yellow)
end

.with_target(klass) ⇒ Object

Push ‘klass` as the current Hammer target for the duration of the block. Top-level DSL methods (`task`, `namespace`, `before` - see `Hammer::DSL`) read this thread-local, so files `require`d from inside a Hammerfile register against the right target.



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# File 'lib/lux-hammer.rb', line 322

def with_target(klass)
  prev = Thread.current[:hammer_target]
  Thread.current[:hammer_target] = klass
  yield
ensure
  Thread.current[:hammer_target] = prev
end

Instance Method Details

#hammer(name, *args, **opts) ⇒ Object

Inside a command’s ‘proc do |opts| … end`, call sibling commands:

task :deploy do
  proc do |opts|
    hammer :build
    hammer 'db:migrate', pretend: true
  end
end

Dispatches from the root class so colon paths resolve against the full tree even when called from inside a namespaced command.



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# File 'lib/lux-hammer.rb', line 871

def hammer(name, *args, **opts)
  self.class.root.hammer(name, *args, **opts)
end