(import irregex)
(use srfi-1 ports files posix)

(define (get-egg-dependencies meta-data #!key with-test-dependencies?
                                              with-versions?)
  (define (deps key)
    (or (and-let* ((d (assq key meta-data)))
          (cdr d))
        '()))
  (map (lambda (dep)
         (if with-versions?
             dep
             (if (pair? dep)
                 (car dep)
                 dep)))
       (append (deps 'depends)
               (deps 'needs)
               (if with-test-dependencies?
                   (deps 'test-depends)
                   '()))))


(define (cmd-line-arg option args)
  ;; Returns the argument associated to the command line option OPTION
  ;; in ARGS or #f if OPTION is not found in ARGS or doesn't have any
  ;; argument.
  (let ((val (any (lambda (arg)
                    (irregex-match
                     `(seq ,(->string option) "=" (submatch (* any)))
                     arg))
                  args)))
    (and val (irregex-match-substring val 1))))


(define (die . msg)
  (with-output-to-port (current-error-port)
    (lambda ()
      (for-each display msg)
      (newline)
      (flush-output)))
  (exit 1))


(define (mktempdir)
  ;; For compatibility with older chickens.
  ;; `create-temporary-directory' has been introduced by 4.6.0
  (let loop ()
    (let ((dir (make-pathname
                (current-directory)
                (string-append "salmonella-tmp-"
                               (number->string (random 1000000) 16)))))
        (if (file-exists? dir)
            (loop)
            (begin
              (create-directory dir)
              dir)))))

(define (usage #!key exit-code epidemy?)
  (let ((this (pathname-strip-directory (program-name))))
    (display #<#EOF
#this [ -h | --help ]
#this [ [ <options> ] eggs ]

When called without eggs in the command line, salmonella will try to
find a .setup file in the current directory and process it (just like
chicken-install).

<options>:
--log-file=<logfile>
    The name for the log file to be generated by salmonella
    (default=salmonella.log).

--chicken-installation-prefix=<prefix dir>
    If you want to test eggs using a chicken installed on a certain directory,
    you can use this option (it should point to the same directory as given to
    `PREFIX' when installing CHICKEN). If omitted, salmonella uses CHICKEN
    tools from the current runtime's installation prefix.

--chicken-install-args=<install args>
    This option can be used customize chicken-install's arguments.  You can
    use <repo> to indicate where you want the actual repository directory
    to be replaced by salmonella.

--eggs-source-dir=<eggs dir>
    By default, salmonella fetches eggs from the egg server.  If you have a
    local copy of eggs code, you can use this option to point to the directory
    where they are located.

--eggs-doc-dir=<doc dir>
    By default, salmonella checks if documentation for eggs exist by accessing
    the CHICKEN wiki.  If you have a local copy of the wiki documentation for
    eggs, you can use this option to point to the directory where they can be
    found.

--keep-repo
    For each egg that salmonella tests, it sets the egg installation repository
    empty and removes it at the end of its execution.  This option makes
    salmonella keep the egg installation repository after testing each egg and
    after finishing its execution.  This option can save a lot of time when
    testing several eggs, at the cost of potentially making salmonella unable
    to catch dependencies problems.

--skip-eggs=<comma-separated list of eggs to skip>
    A comma-separated list of eggs to be skipped.

--repo-dir=<path to repo dir to be used>
    Alternative location for the egg installation directory used by salmonella.
    By default, salmonella generates a `salmonella-tmp-xxxxx' directory in the
    current directory.  This option can be useful when used with `--keep-repo'
    to reuse egg installation repositories for several salmonella executions.

--verbosity=<number>
    A number to indicate salmonella's verbosity level.  0 means practically
    silent. 1 is mostly silent and 2 (default) prints some useful information
    while salmonella is running.

EOF
)
    (when epidemy?
      (display #<#EOF

--instances=<number>
    Number of salmonella instances to run in parallel.

--salmonella-prefix=<prefix dir>
    Path to the directory where salmonella is installed.  The default
    value is the same prefix directory as salmonella-epidemy.

EOF
))
    (newline)
    (when exit-code (exit exit-code))))