RELEASE -- prepared release notes for 0.5.2
ccp-pack.scm added to lib *.tex "foldl" -> "fold" fixup What's with list-lib?
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RELEASE
166
RELEASE
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We are pleased to release scsh version 0.5.2 to celebrate Independence Day.
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The new release has many bug fixes, improvements and new features.
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Scsh 0.5.2 Release notes -*- outline -*-
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We are pleased to release scsh version 0.5.2. The new release has many bug
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fixes, improvements and new features.
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The text below gives a general description of scsh, instructions for obtaining
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it, pointers to discussion forums, and a description of the new features in
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release 0.5.2. (Emacs should display this document is in outline mode. Say
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c-h m for instructions on how to move through it by sections (e.g., c-c c-n,
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c-c c-p).)
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This release is the first new release of scsh in over a year. We've been
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using it, and have had no problems. However, we only recommend eager users
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download it. We'll upgrade it to a 0.5.3 release after a week or two, when
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this release has been shaken out.
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The text below gives a general description of scsh, instructions for
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obtaining it, pointers to discussion forums, and a description of the
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new features in release 0.5. To read this document with emacs outline
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mode, say M-x outline-mode.
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* What is scsh
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==============
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@ -32,13 +41,18 @@ Scsh isn't Scheme-like; it is Scheme.
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At the scripting level, scsh also has an Awk design, also implemented
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as a macro that can be embedded inside general Scheme code.
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Scripts can be written as standalone Scheme source files, with a leading
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#!/usr/local/bin/scsh -s
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trigger line.
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** Scsh as a systems-programming language
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-----------------------------------------
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Scsh additionally provides the low-level access to the operating system
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normally associated with C. The current release provides full access to Posix,
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plus important non-Posix extensions, such as complete sockets
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support. "Complete Posix" means: fork, exec & wait, sockets, full read, write,
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open & close, seek & tell, complete file-system access, including stat,
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plus important non-Posix extensions, such as complete sockets support.
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"Complete Posix" means: fork, exec & wait, sockets, full read, write, open &
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close, seek & tell, complete file-system access, including stat,
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chmod/chgrp/chown, symlink, FIFO & directory access, tty & pty support, file
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locking, pipes, select, file-name pattern-matching, time & date, environment
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variables, signal handlers, and more.
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@ -76,6 +90,7 @@ Unix platforms. We currently have scsh implementations for
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Solaris,
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SunOS,
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Ultrix
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[Brian- can you edit this list]
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Scsh code should run without change across these systems.
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Porting to new platforms is usually not difficult.
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@ -124,73 +139,116 @@ list for other reasons, send mail to
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* The World-Wide What?
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======================
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We even have one of those URL things:
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http://www-swiss.ai.mit.edu/scsh/
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* New in this release
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=====================
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** Scsh is now "open source."
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We finally got around to tacking an ideologically hip copyright
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onto the source. (Not that we ever cared before what you did with
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the system...) The Scheme 48 authors have also graciously retrofitted
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a BSD-style open-source copyright onto the underlying Scheme 48 0.36
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platform for us. The whole system is now open source, top-to-bottom.
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** Signal handlers
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We finally have signal handlers. Go wild.
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Take all the code you like; we'll just write more.
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** Static heap linker
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The static heap linker converts a Scheme 48 bytecode image as
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embodied in a .image file to a C representation. This C
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code is then compiled and linked in with a virtual machine. One
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pleasant side effect of this is reduced startup times and heap sizes.
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Another good thing is that immutable parts of the image can be shared
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between processes. see the script scsh/static.scm
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** CVS repository now public-readable
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Here's what you do:
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CVS_RSH=ssh
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cvs -d kowloon-bay.ai.mit.edu:/projects/express/scsh-cvs checkout scsh
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** Last few bits of Posix
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Scheme bindings for isatty(), ttyname(), ctermid(), and fcntl().
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** New char-sets and char-set operations
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See the manual for more information on using character sets
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for text processing. Also, see the ccp package in scsh/scsh/lib
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for a new library providing character->character partial maps,
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which are also useful for general string processing.
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** Regular expression compilation
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- MAKE-REGEXP now actually does something useful.
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- AWK has been modified to use it, precompiling all of its
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patterns outside the main loop.
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- Unfortunately, things are still pretty slow. We'll work on it.
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** New regular expression system
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There's a whole, new regexp package in scsh. There's a new,
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s-expression-based notation for regexps, called SRE's. The new
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notation has been integrated into the AWK macro and field-parser functions.
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The older Posix notation is still supported for backwards compatibility.
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There's a whole chapter on regexps in the new manual; it has full details.
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** New meta-arg second-line syntax
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Simpler grammar.
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The previous AWK and field-reader system is provided in a
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backwards-compatibility package. See package obsolete-awk-package
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in scsh-package.scm.
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** New -sfd <fdes> command line switch
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Scripts can be read from stdin or other open file descriptors.
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** New libraries
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The SRFI-1 list library is available, in the list-lib package.
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There is a large, powerful string-processing library available
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in the string-lib package. See the directory scsh/scsh/lib/ for
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documentation and source.
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** Starting up programs with the "-e <entry-point>" command-line
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switch and with the (DUMP-SCSH-PROGRAM <file-name> <entry-point>)
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are now equivalent in that both pass a list of command-line arguments
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that includes the program name. The two start-up methods were not
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the same in the previous release. NOTE: THIS IS A BACKWARDS-INCOMPATIBLE
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CHANGE IN DUMP-SCSH-PROGRAM FROM THE PREVIOUS RELEASE.
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These libraries make basic list and string hacking very straightforward.
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** Etc.
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Solaris 2 on i386 support, AIX 4 support, HP-UX now uses dld for
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faster loading, a few small networking bug fixs, better error
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reporting, bug fixes, more efficient handling of closing unrevealed
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file descriptors at exec() with CLOEXEC, ...
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** Renaming
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We are shifting from a reduce-foo convention to a more standard
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foo-fold convention. This has caused the following renamings:
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reduce-char-set => char-set-fold
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reduce-port => port-fold
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The older names are still bound, but are deprecated and will likely
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go away in a future release.
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String utilities INDEX and RINDEX are gone. Use the string-lib procedures
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instead.
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** Bugfixes
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Over a year's worth of bug fixes. In particular, the old problems with the
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signal system blowing up builds on some of the more obscure Unix systems
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have been fixed.
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* Thanks
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========
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We would like to thank Michael Becker, Glenn Barry, Travis Broughton,
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Robert E. Brown, Charlie Conklin, Franklin Chen, Jin S. Choi, Douglas
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S. J. De Couto, Brian F. Dennis, Sean Doran, Kevin Esler, Lutz Euler,
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Lewis Girod, Dan Hagerty, Rolf-Thomas Happe, David Hull, Steven L.
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Jenkins, Patrick May, Richard Kelsey, Jay Nietling, Tod Olson, Stephen
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Pascoe, Jonathan Rees, Michel Schinz, Cotton Seed, Bill Sommerfeld,
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Michael Sperber, Steven L. Tamm, Ed Tobin, Victor Zandy, and others
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for bug reports, bug fixes, and comments that were incorporated into
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this release. We really appreciate their help, particularly in the
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task of porting scsh to new platforms.
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We would like to thank the members of local-resistance cells for the
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Underground everywhere for bug reports, bug fixes, design review and comments
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that were incorporated into this release. We really appreciate their help,
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particularly in the task of porting scsh to new platforms.
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[Brian- will you add your set of names to this list?]
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Alan Bawden,
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Jim Blandy,
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Per Bothner,
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Tom Breton,
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Christopher Browne,
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Ray Dillinger,
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Allyn Dimock,
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Scott Draves,
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Lutz Euler,
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Jeremy Fitzhardinge,
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Noah Friedman,
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Martin Gasbichler,
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Andy Gaynor,
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Ian Grant,
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Eric Hanchrow,
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Karl Hegbloom,
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Ian Horswill & the Northwestern Scheme wizards
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Graham Hughes,
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Lars Kellogg-Stedman,
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Andre Koehoerst,
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Shriram Krishnamurthi,
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Jakob Lichtenberg,
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Eric Marsden,
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Willliam Pippin,
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David Rush,
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Michael Schinz,
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Manuel Serrano,
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Mark Shirley
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Bill Somerfeld,
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Mike Sperber,
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Harvey J. Stein,
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Pawel Turnau,
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We'd like to thank everyone else for their patience; this release seemed like
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a long time coming.
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Brought to you by the Scheme Underground scsh team. Go forth and write
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elegant systems programs.
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Brought to you by the Scheme Underground. Go forth and write elegant systems
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programs.
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-Olin Shivers & Brian Carlstrom
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Cambridge
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14 June 1997
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29 September 1999
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@ -629,10 +629,10 @@ of input stream.
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(#t (max max-len (string-length line))))\end{code}
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\begin{code}
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;;; (This could also be done with PORT-FOLDL:)
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(port-foldl (current-input-port) read-line
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(lambda (line maxlen) (max (string-length line) maxlen))
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0)\end{code}
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;;; (This could also be done with PORT-FOLD:)
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(port-fold (current-input-port) read-line
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(lambda (line maxlen) (max (string-length line) maxlen))
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0)\end{code}
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\begin{code}
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;;; Print every line longer than 80 chars.
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@ -324,12 +324,12 @@ run/sexp* $\equiv$ read $\circ$ run/port*
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run/sexps* $\equiv$ port->sexp-list $\circ$ run/port*\end{code}
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\end{desc}
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\defun{port-foldl}{port reader op . seeds} {\object\star}
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\defun{port-fold}{port reader op . seeds} {\object\star}
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\begin{desc}
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This procedure can be used to perform a variety of iterative operations
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over an input stream.
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It repeatedly uses \var{reader} to read an object from \var{port}.
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If the first read returns eof, then the entire \ex{port-foldl}
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If the first read returns eof, then the entire \ex{port-fold}
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operation returns the seeds as multiple values.
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If the first read operation returns some other value $v$, then
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\var{op} is applied to $v$ and the seeds:
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@ -340,9 +340,9 @@ reading a new value from the port, and so forth.
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For example, \ex{(port->list \var{reader} \var{port})}
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could be defined as
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\codex{(reverse (port-foldl \var{port} \var{reader} cons '()))}
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\codex{(reverse (port-fold \var{port} \var{reader} cons '()))}
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An imperative way to look at \ex{port-foldl} is to say that it
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An imperative way to look at \ex{port-fold} is to say that it
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abstracts the idea of a loop over a stream of values read from
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some port, where the seed values express the loop state.
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