217 lines
8.4 KiB
Scheme
217 lines
8.4 KiB
Scheme
(define-module (gash gash)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 buffered-input)
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#:use-module (ice-9 ftw)
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#:use-module (ice-9 getopt-long)
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#:use-module (ice-9 local-eval)
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#:use-module (ice-9 match)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 readline)
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#:use-module (ice-9 pretty-print)
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#:use-module (ice-9 receive)
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#:use-module (ice-9 regex)
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#:use-module (gash config)
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#:use-module (gash environment)
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#:use-module (gash job)
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#:use-module (gash pipe)
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#:use-module (gash io)
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#:use-module (gash script)
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#:use-module (gash util)
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#:export (main
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%debug-level
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%prefer-builtins?
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parse
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parse-string))
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(define %debug-level 0) ; 1 informational, 2 verbose, 3 peg tracing
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(define %prefer-builtins? #f) ; use builtin, even if COMMAND is available in PATH?
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(define %geesh-parser? #f) ; use Geesh parser [EXPERIMENTAL]
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(define (parse-string string)
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(let ((parser (cond (%geesh-parser? (@ (gash geesh) parse-string))
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(else (@ (gash peg) parse-string)))))
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(parser string)))
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(define (parse port)
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(let ((parser (cond (%geesh-parser? (@ (gash geesh) parse))
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(else (@ (gash peg) parse)))))
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(parser port)))
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(define (file-to-ast file-name)
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(call-with-input-file file-name parse))
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(define (display-help)
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(display "\
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Usage: gash [OPTION]... [FILE]...
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Options:
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-c, --command=STRING Evaluate STRING and exit
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-e, --errexit Exit upon error
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-d, --debug Enable PEG tracing
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-g, --geesh Use Geesh parser [EXPERIMENTAL]
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-h, --help Display this help
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-p, --parse Parse the shell script and print the parse tree
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--prefer-builtins Use builtins, even if command is available in PATH
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-v, --version Display the version
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-x, --xtrace Print simple command trace
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"))
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(define (display-version)
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(display (string-append "
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gash (GASH) " %version "
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Copyright (C) 2016,2017,2018 R.E.W. van Beusekom <rutger.van.beusekom@gmail.com>
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and others.
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This is Gash, Guile As SHell. Gash is free software and is covered by
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the GNU General Public License version 3 or later, see COPYING for the
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copyleft.
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")))
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(define (main args)
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(let ((thunk
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(lambda ()
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(job-control-init)
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(let* ((option-spec '((command (single-char #\c) (value #t))
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(debug (single-char #\d))
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(errexit (single-char #\e))
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(help (single-char #\h))
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(parse (single-char #\p))
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(prefer-builtins)
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(geesh (single-char #\g))
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(version (single-char #\v))
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(xtrace (single-char #\x))))
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(options (getopt-long args option-spec #:stop-at-first-non-option #t ))
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(command? (option-ref options 'command #f))
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(opt? (lambda (name) (lambda (o) (and (eq? (car o) name) (cdr o)))))
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(debug (length (filter-map (opt? 'debug) options)))
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(debug? (option-ref options 'debug #f))
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(help? (option-ref options 'help #f))
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(parse? (option-ref options 'parse #f))
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(version? (option-ref options 'version #f))
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(files (option-ref options '() '())))
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(set! %prefer-builtins? (option-ref options 'prefer-builtins #f))
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(set! %geesh-parser? (option-ref options 'geesh #f))
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(set-shell-opt! "errexit" (option-ref options 'errexit #f))
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(set-shell-opt! "xtrace" (option-ref options 'xtrace #f))
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(when (option-ref options 'debug #f)
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(set! %debug-level debug))
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(cond
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(help? (display-help))
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(version? (display-version))
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(command? (let ((ast (parse-string command?)))
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(if parse? (pretty-print ast)
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(run ast))
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(exit (script-status))))
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((pair? files)
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(let ((asts (map file-to-ast files)))
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(if parse? (map pretty-print asts)
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(for-each run asts))
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(exit (script-status))))
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(#t (let* ((HOME (string-append (getenv "HOME") "/.gash_history"))
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(thunk (lambda ()
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(let loop ((line (readline (prompt))))
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(when (not (eof-object? line))
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(let* ((ast (parse-string line)))
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(when (and ast
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(not (string-null? line)))
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(unless parse?
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(run ast))
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(add-history line))
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(loop (let ((previous (if ast "" (string-append line "\n")))
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(next (readline (if ast (prompt) "> "))))
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(if (eof-object? next) next
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(string-append previous next))))))))))
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(clear-history)
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(read-history HOME)
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(with-readline-completion-function completion thunk)
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(write-history HOME)
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(newline))))))))
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(thunk)))
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(define prompt
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(let* ((l (string #\001))
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(r (string #\002))
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(e (string #\033))
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(user (getenv "USER"))
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(host (gethostname))
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(home (getenv "HOME")))
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(lambda ()
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(let* ((cwd (getcwd))
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(cwd (if (string-prefix? home cwd)
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(string-replace cwd "~" 0 (string-length home))
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cwd)))
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(report-jobs)
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(string-append
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l e "[01;32m" r user "@" host l e "[00m" r ":"
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l e "[01;34m" r cwd l e "[00m" r (if (zero? (getuid)) "# " "$ "))))))
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(define (string-prefix s1 s2)
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(substring/read-only s1 0 (string-prefix-length s1 s2)))
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(define next->file-completion (lambda () #f))
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(define next->binary-completion (lambda () #f))
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(define (isdir? path)
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(and (access? path F_OK) (eq? 'directory (stat:type (stat path)))))
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(define (ls dir)
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(map (lambda (path)
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(if (isdir? (string-append dir path))
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(string-append path "/")
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path))
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(sort (filter (negate (cut string-every #\. <>))
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(scandir (if (string-null? dir) (getcwd) dir))) string<?)))
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(define (complete prefix list)
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(if (string-null? prefix) list
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(filter (cut string-prefix? prefix <>) list)))
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(define (slash dir)
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(if (string-suffix? "/" dir) dir
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(string-append dir "/")))
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(define (after-slash path)
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(let ((at (string-index-right path #\/)))
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(if at (string-drop path (+ 1 at))
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path)))
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(define (file-name-completion text continue?)
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(if continue?
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(next->file-completion)
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(let* ((dir (slash (if (isdir? text) text (dirname text))))
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(listing (ls dir))
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(dir (if (string=? "./" dir) "" dir))
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(completions (complete (after-slash text) listing)))
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(set! next->file-completion
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(lambda ()
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(if (null? completions)
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#f
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(let ((completion (car completions)))
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(set! completions (cdr completions))
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(string-append dir completion)))))
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(next->file-completion))))
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(define (search-binary-in-path-completion text continue?)
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(if (not continue?)
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(let* ((paths (string-split (getenv "PATH") #\:))
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(binaries (apply append (filter identity (map scandir paths))))
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(completions (sort (filter (cut string-prefix? text <>) binaries) string<?)))
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(set! next->binary-completion (lambda ()
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(if (null? completions)
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#f
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(let ((completion (car completions)))
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(set! completions (cdr completions))
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completion))))
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(next->binary-completion))
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(next->binary-completion)))
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(define (completion text continue?)
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(or (file-name-completion text continue?) (search-binary-in-path-completion text continue?)))
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