417 lines
18 KiB
Racket
417 lines
18 KiB
Racket
#lang scribble/doc
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@(require "mz.ss"
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scribble/bnf
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(for-label racket/pretty
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racket/gui/base))
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@(define (FlagFirst n) (as-index (Flag n)))
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@(define (DFlagFirst n) (as-index (DFlag n)))
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@(define (PFlagFirst n) (as-index (PFlag n)))
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@(define (nontermstr s)
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@elem{@racketvalfont{"}@nonterm[s]@racketvalfont{"}})
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@(define eventspace
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@tech[#:doc '(lib "scribblings/gui/gui.scrbl")]{eventspace})
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@title[#:tag "running-sa"]{Running Racket or GRacket}
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The core Racket run-time system is available in two main variants:
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@itemize[
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@item{Racket, which provides the primitives libraries on which
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@racketmodname[racket/base] is implemented. Under Unix and Mac
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OS X, the executable is called
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@as-index{@exec{racket}}. Under Windows, the executable is
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called @as-index{@exec{Racket.exe}}.}
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@item{GRacket, which is a GUI variant of @exec{racket} to the degree
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that the system distinguishes them. Under Unix, the executable
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is called @as-index{@exec{gracket}}, and single-instance flags
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and X11-related flags are handled and communicated specially to
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the @racket[racket/gui/base] library. Under Windows, the
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executable is called @as-index{@exec{GRacket.exe}}, and it is a
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GUI application (as opposed to a console application) that
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implements singe-instance support. Under Mac OS X, the
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@exec{gracket} script launches @as-index{@exec{GRacket.app}}.}
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]
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@; ----------------------------------------------------------------------
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@section[#:tag "init-actions"]{Initialization}
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On start-up, the top-level environment contains no bindings---not even
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@racket[#%app] for function application. Primitive modules with names
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that start with @racketidfont{#%} are defined, but they are not meant
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for direct use, and the set of such modules can change. For example,
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the @indexed-racket['#%kernel] module is eventually used to bootstrap
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the implemetation of @racketmodname[racket/base], and
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@racket['#%mred-kernel] is used for @racketmodname[racket/gui/base].
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The first action of Racket or GRacket is to initialize
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@racket[current-library-collection-paths] to the result of
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@racket[(find-library-collection-paths _pre-extras _extras)], where
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@racket[_pre-extras] is normally @racket[null] and @racket[_extras]
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are extra directory paths provided in order in the command line with
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@Flag{S}/@DFlag{search}. An executable created from the Racket or
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GRacket executable can embed paths used as @racket[_pre-extras].
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Racket and GRacket next @racket[require] @racketmodname[racket/init]
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and @racketmodname[racket/gui/init], respectively, but only if the
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command line does not specify a @racket[require] flag
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(@Flag{t}/@DFlag{require}, @Flag{l}/@DFlag{lib}, or
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@Flag{u}/@DFlag{require-script}) before any @racket[eval],
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@racket[load], or read-eval-print-loop flag (@Flag{e}/@DFlag{eval},
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@Flag{f}/@DFlag{load}, @Flag{r}/@DFlag{script}, @Flag{m}/@DFlag{main},
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or @Flag{i}/@DFlag{repl}). The initialization library can be changed
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with the @Flag{I} @tech{configuration option}. The
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@racket['configure-runtime] property of the initialization library's
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language is used before the library is instantiated; see
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@secref["configure-runtime"].
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After potentially loading the initialization module, expression
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@racket[eval]s, files @racket[load]s, and module @racket[require]s are
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executed in the order that they are provided on the command line. If
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any raises an uncaught exception, then the remaining @racket[eval]s,
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@racket[load]s, and @racket[require]s are skipped. If the first
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@racket[require] precedes any @racket[eval] or @racket[load] so that
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the initialization library is skipped, then the
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@racket['configure-runtime] property of the required module's library
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language is used before the module is instantiated; see
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@secref["configure-runtime"].
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After running all command-line expressions, files, and modules,
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Racket or GRacket then starts a read-eval-print loop for interactive
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evaluation if no command line flags are provided other than
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@tech{configuration options}. If any command-line argument is
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provided that is not a @tech{configuration option}, then the
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read-eval-print-loop is not started, unless the @Flag{i}/@DFlag{repl}
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flag is provided on the command line to
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specifically re-enable it. In addition, just before the command line
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is started, Racket loads the file @racket[(find-system-path
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'init-file)] and GRacket loads the file
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@racket[(find-graphical-system-path 'init-file)] is loaded, unless the
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@Flag{q}/@DFlag{no-init-file} flag is specified on the command line.
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Finally, before Racket or GRacket exits, it calls the procedure that
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is the current value of @racket[executable-yield-handler] in the main
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thread, unless the @Flag{V}/@DFlag{no-yield} command-line flag is
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specified. Requiring @racketmodname[racket/gui/base] sets this parameter call
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@racket[(racket 'yield)].
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@; ----------------------------------------------------------------------
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@section[#:tag "exit-status"]{Exit Status}
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The default exit status for a Racket or GRacket process is non-zero if
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an error occurs during a command-line @racket[eval] (via @Flag{e},
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etc.), @racket[load] (via @Flag{f}, @Flag{r}, etc.), or
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@racket[require] (via @Flag{-l}, @Flag{t}, etc.), but only when no
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read-eval-print loop is started. Otherwise, the default exit status is
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@racket[0].
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In all cases, a call to @racket[exit] (when the default @tech{exit
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handler} is in place) can end the process with a specific status
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value.
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@; ----------------------------------------------------------------------
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@include-section["init.scrbl"]
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@; ----------------------------------------------------------------------
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@section[#:tag "mz-cmdline"]{Command Line}
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The Racket and GRacket executables recognize the following command-line
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flags:
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@itemize[
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@item{File and expression options:
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@itemize[
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@item{@FlagFirst{e} @nonterm{expr} or @DFlagFirst{eval}
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@nonterm{expr} : @racket[eval]s @nonterm{expr}. The results of
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the evaluation are printed via @racket[current-print].}
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@item{@FlagFirst{f} @nonterm{file} or @DFlagFirst{load}
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@nonterm{file} : @racket[load]s @nonterm{file}; if
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@nonterm{file} is @filepath{-}, then expressions are read and
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evaluated from standard input.}
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@item{@FlagFirst{t} @nonterm{file} or @DFlagFirst{require}
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@nonterm{file} : @racket[require]s @nonterm{file}.}
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@item{@FlagFirst{l} @nonterm{path} or @DFlagFirst{lib}
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@nonterm{path} : @racket[require]s @racket[(lib
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@#,nontermstr{path})].}
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@item{@FlagFirst{p} @nonterm{package} :
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@racket[require]s @racket[(planet @#,nontermstr{package})].
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@margin-note{Despite its name, @DFlag{script} is not usually
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used for Unix scripts. See @guidesecref["scripts"] for more
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information on scripts.}}
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@item{@FlagFirst{r} @nonterm{file} or @DFlagFirst{script}
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@nonterm{file} : @racket[load]s @nonterm{file} as a
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script. This flag is like @Flag{t} @nonterm{file} plus
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@Flag{N} @nonterm{file} to set the program name and @Flag{-}
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to cause all further command-line elements to be treated as
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non-flag arguments.}
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@item{@FlagFirst{u} @nonterm{file} or @DFlagFirst{require-script}
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@nonterm{file} : @racket[require]s @nonterm{file} as a script;
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This flag is like @Flag{t} @nonterm{file} plus @Flag{N}
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@nonterm{file} to set the program name and @Flag{-} to cause
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all further command-line elements to be treated as non-flag
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arguments.}
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@item{@FlagFirst{k} @nonterm{n} @nonterm{m} : Loads code embedded in
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the executable from file position @nonterm{n} to
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@nonterm{m}. This option is normally embedded in a stand-alone
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binary that also embeds Racket code.}
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@item{@FlagFirst{m} or @DFlagFirst{main} : Evaluates a call to
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@racketidfont{main} as bound in the top-level environment. All
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of the command-line arguments that are not processed as
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options (i.e., the arguments put into
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@racket[current-command-line-arguments]) are passed as
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arguments to @racketidfont{main}. The results of the call are
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printed via @racket[current-print].
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The call to @racketidfont{main} is constructed as an
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expression @racket[((unsyntax @racketidfont{main}) _arg-str
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...)] where the lexical context of the expression gives
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@racketidfont{#%app} and @racketidfont{#%datum} bindings as
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@racket[#%plain-app] and @racket[#%datum], but the lexical
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context of @racketidfont{main} is the top-level environment.}
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]}
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@item{Interaction options:
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@itemize[
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@item{@FlagFirst{i} or @DFlagFirst{repl} : Runs interactive read-eval-print
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loop, using either @racket[read-eval-print-loop] (Racket) or
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@racket[graphical-read-eval-print-loop] (GRacket) after showing
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@racket[(banner)] and loading @racket[(find-system-path
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'init-file)]. For GRacket, supply the @Flag{z}/@DFlag{text-repl}
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configuration option to use @racket[read-eval-print-loop]
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instead of @racket[graphical-read-eval-print-loop].}
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@item{@FlagFirst{n} or @DFlagFirst{no-lib} : Skips requiring the
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initialization library (i.e., @racketmodname[racket/init] or
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@racketmodname[racket/gui/init], unless it is changed with the
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@Flag{I} flag) when not otherwise disabled.}
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@item{@FlagFirst{v} or @DFlagFirst{version} : Shows
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@racket[(banner)].}
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@item{@FlagFirst{K} or @DFlagFirst{back} : GRacket, Mac OS X only;
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leave application in the background.}
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@item{@FlagFirst{V} @DFlagFirst{no-yield} : Skips final
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@racket[executable-yield-handler] action, which normally waits until all
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frames are closed, @|etc| in the main @|eventspace| before
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exiting for programs that use @racketmodname[racket/gui/base].}
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]}
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@item{@deftech{Configuration options}:
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@itemize[
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@item{@FlagFirst{c} or @DFlagFirst{no-compiled} : Disables loading
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of compiled byte-code @filepath{.zo} files, by initializing
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@racket[current-compiled-file-paths] to @racket[null].}
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@item{@FlagFirst{q} or @DFlagFirst{no-init-file} : Skips loading
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@racket[(find-system-path 'init-file)] for
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@Flag{i}/@DFlag{repl}.}
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@item{@FlagFirst{z} or @DFlagFirst{text-repl} : GRacket only; changes
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@Flag{i}/@DFlag{repl} to use
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@racket[textual-read-eval-print-loop] instead of
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@racket[graphical-read-eval-print-loop].}
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@item{@FlagFirst{I} @nonterm{path} : Sets @racket[(lib
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@#,nontermstr{path})] as the path to @racket[require] to initialize
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the namespace, unless namespace initialization is disabled.}
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@item{@FlagFirst{X} @nonterm{dir} or @DFlagFirst{collects}
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@nonterm{dir} : Sets @nonterm{dir} as the path to the main
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collection of libraries by making @racket[(find-system-path
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'collects-dir)] produce @nonterm{dir}.}
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@item{@FlagFirst{S} @nonterm{dir} or @DFlagFirst{search}
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@nonterm{dir} : Adds @nonterm{dir} to the default library
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collection search path after the main collection directory. If
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the @Flag{S}/@DFlag{dir} flag is supplied multiple times, the
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search order is as supplied.}
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@item{@FlagFirst{U} or @DFlagFirst{no-user-path} : Omits
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user-specific paths in the search for collections, C
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libraries, etc. by initializing the
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@racket[use-user-specific-search-paths] parameter to
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@racket[#f].}
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@item{@FlagFirst{N} @nonterm{file} or @DFlagFirst{name}
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@nonterm{file} : sets the name of the executable as reported
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by @racket[(find-system-path 'run-file)] to
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@nonterm{file}.}
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@item{@FlagFirst{j} or @DFlagFirst{no-jit} : Disables the
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native-code just-in-time compiler by setting the
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@racket[eval-jit-enabled] parameter to @racket[#f].}
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@item{@FlagFirst{d} or @DFlagFirst{no-delay} : Disables on-demand
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parsing of compiled code and syntax objects by setting the
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@racket[read-on-demand-source] parameter to @racket[#f].}
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@item{@FlagFirst{b} or @DFlagFirst{binary} : Requests binary mode,
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instead of text mode, for the process's input, out, and error
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ports. This flag currently has no effect, because binary mode
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is always used.}
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@item{@FlagFirst{W} @nonterm{level} or @DFlagFirst{warn}
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@nonterm{level} : Sets the logging level for writing events to
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the original error port. The possible @nonterm{level} values
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are the same as for the @envvar{PLTSTDERR} environment
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variable. See @secref["logging"] for more information.}
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@item{@FlagFirst{L} @nonterm{level} or @DFlagFirst{syslog}
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@nonterm{level} : Sets the logging level for writing events to
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the system log. The possible @nonterm{level} values
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are the same as for the @envvar{PLTSYSLOG} environment
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variable. See @secref["logging"] for more information.}
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]}
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@item{Meta options:
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@itemize[
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@item{@FlagFirst{-} : No argument following this flag is itself used
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as a flag.}
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@item{@FlagFirst{h} or @DFlagFirst{help} : Shows information about
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the command-line flags and start-up process and exits,
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ignoring all other flags.}
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]}
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]
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If at least one command-line argument is provided, and if the first
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one after any @tech{configuration option} is not a flag, then a
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@Flag{u}/@DFlag{require-script} flag is implicitly added before the
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first non-flag argument.
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If no command-line arguments are supplied other than
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@tech{configuration options}, then the @Flag{i}/@DFlag{repl} flag is
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effectively added.
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For GRacket under X11, the follow flags are recognized when they appear
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at the beginning of the command line, and they count as configuration
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options (i.e., they do not disable the read-eval-print loop or prevent
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the insertion of @Flag{u}/@DFlag{require-script}):
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@itemize[
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@item{@FlagFirst{display} @nonterm{display} : Sets the X11 display
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to use.}
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@item{@FlagFirst{geometry} @nonterm{arg}, @FlagFirst{bg}
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@nonterm{arg}, @FlagFirst{background} @nonterm{arg},
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@FlagFirst{fg} @nonterm{arg}, @FlagFirst{foreground}
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@nonterm{arg}, @FlagFirst{fn} @nonterm{arg}, @FlagFirst{font}
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@nonterm{arg}, @FlagFirst{iconic}, @FlagFirst{name}
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@nonterm{arg}, @FlagFirst{rv}, @FlagFirst{reverse},
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@PFlagFirst{rv}, @FlagFirst{selectionTimeout} @nonterm{arg},
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@FlagFirst{synchronous}, @FlagFirst{title} @nonterm{arg},
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@FlagFirst{xnllanguage} @nonterm{arg}, or @FlagFirst{xrm}
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@nonterm{arg} : Standard X11 arguments that are mostly ignored
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but accepted for compatibility with other X11 programs. The
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@Flag{synchronous} flag behaves in the usual
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way.}
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@item{@FlagFirst{singleInstance} : If an existing GRacket is already
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running on the same X11 display, if it was started on a
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machine with the same hostname, and if it was started with the
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same name as reported by @racket[(find-system-path
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'run-file)]---possibly set with the @Flag{N}/@DFlag{name}
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command-line argument---then all non-option command-line
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arguments are treated as filenames and sent to the existing
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GRacket instance via the application file handler (see
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@racket[application-file-handler]).}
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]
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Similarly, under Mac OS X, a leading switch starting with
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@FlagFirst{psn_} is treated as a special configuration option. It
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indicates that Finder started the application, so the current input,
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output, and error output are redirected to a GUI window.
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Multiple single-letter switches (the ones preceded by a single
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@litchar{-}) can be collapsed into a single switch by concatenating
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the letters, as long as the first switch is not @Flag{-}. The
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arguments for each switch are placed after the collapsed switches (in
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the order of the switches). For example,
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@commandline{-ifve @nonterm{file} @nonterm{expr}}
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and
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@commandline{-i -f @nonterm{file} -v -e @nonterm{expr}}
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are equivalent. If a collapsed @Flag{-} appears before other collapsed
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switches in the same collapsed set, it is implicitly moved to the end
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of the collapsed set.
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Extra arguments following the last option are available from the
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@indexed-racket[current-command-line-arguments] parameter.
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@; ----------------------------------------------------------------------
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@section[#:tag "configure-runtime"]{Language Run-Time Configuration}
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@guidealso["module-runtime-config"]
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When a module is implemented using @hash-lang{}, the language after
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@hash-lang{} can specify configuration actions to perform when a
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module using the language is the main module of a program. The
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language specifies run-time configuration by
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@itemlist[
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@item{attaching a @racket['module-language] @tech{syntax property} to
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the module as read from its source (see @racket[module] and
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@racket[module-compiled-language-info]);}
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@item{having the function indicated by the @racket['module-language]
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@tech{syntax property} recognize the
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@indexed-racket['configure-runtime] key, for which it returns a list of
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vectors; each vector must have the form @racket[(vector _mp
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_name _val)] where @racket[_mp] is a @tech{module path},
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@racket[_name] is a symbol, and @racket[_val] is an arbitrary
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value; and}
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@item{having each function called as @racket[((dynamic-require _mp
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_name) _val)] configure the run-time environment, typically by
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setting parameters such as @racket[current-print].}
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]
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A @racket['configure-runtime] query returns a list of vectors, instead
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of directly configuring the environment, so that the indicated modules
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to be bundled with a program when creating a stand-alone
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executable; see @secref[#:doc '(lib "scribblings/raco/raco.scrbl") "exe"].
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For information on defining a new @hash-lang[] language, see
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@racketmodname[syntax/module-reader].
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