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-rw-r--r--doc/Makefile.am11
-rw-r--r--doc/Makefile.in37
-rw-r--r--doc/using-git.texi1179
3 files changed, 1210 insertions, 17 deletions
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 8a0442a7..91a7f580 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -24,7 +24,7 @@
## process this file with automake to produce Makefile.in
-info_TEXINFOS = gawk.texi gawkinet.texi
+info_TEXINFOS = gawk.texi gawkinet.texi using-git.texi
man_MANS = gawk.1
@@ -50,7 +50,7 @@ EXTRA_DIST = ChangeLog ChangeLog.0 README.card ad.block setter.outline \
bc_notes
# Get rid of generated files when cleaning
-CLEANFILES = *.ps *.html *.dvi *~ awkcard.nc awkcard.tr gawk.pdf gawkinet.pdf awkcard.pdf gawk.1.pdf
+CLEANFILES = *.ps *.html *.dvi *~ awkcard.nc awkcard.tr gawk.pdf gawkinet.pdf using-git.pdf awkcard.pdf gawk.1.pdf
MAKEINFO = @MAKEINFO@ --no-split --force
@@ -75,9 +75,9 @@ AWKCARD = awkcard.ps
gawk.texi: $(srcdir)/gawktexi.in $(srcdir)/sidebar.awk
awk -f $(srcdir)/sidebar.awk < $(srcdir)/gawktexi.in > gawk.texi
-postscript: gawk.ps gawkinet.ps gawk.1.ps $(AWKCARD)
+postscript: gawk.ps gawkinet.ps using-git.ps gawk.1.ps $(AWKCARD)
-pdf: postscript gawk.pdf gawkinet.pdf awkcard.pdf gawk.1.pdf
+pdf: postscript gawk.pdf gawkinet.pdf using-git.pdf awkcard.pdf gawk.1.pdf
gawk.ps: gawk.dvi
TEXINPUTS=$(srcdir): dvips -o gawk.ps gawk.dvi
@@ -85,6 +85,9 @@ gawk.ps: gawk.dvi
gawkinet.ps: gawkinet.dvi
TEXINPUTS=$(srcdir): dvips -o gawkinet.ps gawkinet.dvi
+using-git.ps: using-git.dvi
+ TEXINPUTS=$(srcdir): dvips -o using-git.ps using-git.dvi
+
gawk.1.ps: gawk.1
-groff -man $(srcdir)/gawk.1 > gawk.1.ps
diff --git a/doc/Makefile.in b/doc/Makefile.in
index 0219bc97..3444b90b 100644
--- a/doc/Makefile.in
+++ b/doc/Makefile.in
@@ -173,13 +173,14 @@ AM_V_texidevnull = $(am__v_texidevnull_@AM_V@)
am__v_texidevnull_ = $(am__v_texidevnull_@AM_DEFAULT_V@)
am__v_texidevnull_0 = > /dev/null
am__v_texidevnull_1 =
-INFO_DEPS = $(srcdir)/gawk.info $(srcdir)/gawkinet.info
+INFO_DEPS = $(srcdir)/gawk.info $(srcdir)/gawkinet.info \
+ $(srcdir)/using-git.info
am__TEXINFO_TEX_DIR = $(srcdir)
-DVIS = gawk.dvi gawkinet.dvi
-PDFS = gawk.pdf gawkinet.pdf
-PSS = gawk.ps gawkinet.ps
-HTMLS = gawk.html gawkinet.html
-TEXINFOS = gawk.texi gawkinet.texi
+DVIS = gawk.dvi gawkinet.dvi using-git.dvi
+PDFS = gawk.pdf gawkinet.pdf using-git.pdf
+PSS = gawk.ps gawkinet.ps using-git.ps
+HTMLS = gawk.html gawkinet.html using-git.html
+TEXINFOS = gawk.texi gawkinet.texi using-git.texi
TEXI2DVI = texi2dvi
TEXI2PDF = $(TEXI2DVI) --pdf --batch
MAKEINFOHTML = $(MAKEINFO) --html
@@ -352,7 +353,7 @@ target_alias = @target_alias@
top_build_prefix = @top_build_prefix@
top_builddir = @top_builddir@
top_srcdir = @top_srcdir@
-info_TEXINFOS = gawk.texi gawkinet.texi
+info_TEXINFOS = gawk.texi gawkinet.texi using-git.texi
man_MANS = gawk.1
EXTRA_DIST = ChangeLog ChangeLog.0 README.card ad.block setter.outline \
awkcard.in awkforai.txt texinfo.tex cardfonts \
@@ -377,7 +378,7 @@ EXTRA_DIST = ChangeLog ChangeLog.0 README.card ad.block setter.outline \
# Get rid of generated files when cleaning
-CLEANFILES = *.ps *.html *.dvi *~ awkcard.nc awkcard.tr gawk.pdf gawkinet.pdf awkcard.pdf gawk.1.pdf
+CLEANFILES = *.ps *.html *.dvi *~ awkcard.nc awkcard.tr gawk.pdf gawkinet.pdf using-git.pdf awkcard.pdf gawk.1.pdf
TROFF = groff -t -Tps -U
SEDME = sed -e "s/^level0 restore/level0 restore flashme 100 72 moveto (Copyright `date '+%m-%d-%y %T'`, FSF, Inc. (all)) show/" \
-e "s/^\/level0 save def/\/level0 save def 30 -48 translate/"
@@ -474,6 +475,10 @@ $(srcdir)/gawkinet.info: gawkinet.texi
gawkinet.dvi: gawkinet.texi
gawkinet.pdf: gawkinet.texi
gawkinet.html: gawkinet.texi
+$(srcdir)/using-git.info: using-git.texi
+using-git.dvi: using-git.texi
+using-git.pdf: using-git.texi
+using-git.html: using-git.texi
.dvi.ps:
$(AM_V_DVIPS)TEXINPUTS="$(am__TEXINFO_TEX_DIR)$(PATH_SEPARATOR)$$TEXINPUTS" \
$(DVIPS) $(AM_V_texinfo) -o $@ $<
@@ -555,13 +560,16 @@ dist-info: $(INFO_DEPS)
done
mostlyclean-aminfo:
- -rm -rf gawk.t2d gawk.t2p gawkinet.t2d gawkinet.t2p
+ -rm -rf gawk.t2d gawk.t2p gawkinet.t2d gawkinet.t2p using-git.t2d \
+ using-git.t2p
clean-aminfo:
-test -z "gawk.dvi gawk.pdf gawk.ps gawk.html gawkinet.dvi gawkinet.pdf \
- gawkinet.ps gawkinet.html" \
+ gawkinet.ps gawkinet.html using-git.dvi using-git.pdf \
+ using-git.ps using-git.html" \
|| rm -rf gawk.dvi gawk.pdf gawk.ps gawk.html gawkinet.dvi gawkinet.pdf \
- gawkinet.ps gawkinet.html
+ gawkinet.ps gawkinet.html using-git.dvi using-git.pdf \
+ using-git.ps using-git.html
maintainer-clean-aminfo:
@list='$(INFO_DEPS)'; for i in $$list; do \
@@ -878,9 +886,9 @@ uninstall-man: uninstall-man1
gawk.texi: $(srcdir)/gawktexi.in $(srcdir)/sidebar.awk
awk -f $(srcdir)/sidebar.awk < $(srcdir)/gawktexi.in > gawk.texi
-postscript: gawk.ps gawkinet.ps gawk.1.ps $(AWKCARD)
+postscript: gawk.ps gawkinet.ps using-git.ps gawk.1.ps $(AWKCARD)
-pdf: postscript gawk.pdf gawkinet.pdf awkcard.pdf gawk.1.pdf
+pdf: postscript gawk.pdf gawkinet.pdf using-git.pdf awkcard.pdf gawk.1.pdf
gawk.ps: gawk.dvi
TEXINPUTS=$(srcdir): dvips -o gawk.ps gawk.dvi
@@ -888,6 +896,9 @@ gawk.ps: gawk.dvi
gawkinet.ps: gawkinet.dvi
TEXINPUTS=$(srcdir): dvips -o gawkinet.ps gawkinet.dvi
+using-git.ps: using-git.dvi
+ TEXINPUTS=$(srcdir): dvips -o using-git.ps using-git.dvi
+
gawk.1.ps: gawk.1
-groff -man $(srcdir)/gawk.1 > gawk.1.ps
diff --git a/doc/using-git.texi b/doc/using-git.texi
new file mode 100644
index 00000000..1812c153
--- /dev/null
+++ b/doc/using-git.texi
@@ -0,0 +1,1179 @@
+\input texinfo @c -*-texinfo-*-
+@c %**start of header (This is for running Texinfo on a region.)
+@setfilename using-git.info
+@settitle Workflow in the @command{gawk} project
+@c %**end of header (This is for running Texinfo on a region.)
+
+@dircategory Network applications
+@direntry
+* Gawkworkflow: (using-git). Workflow in the `gawk' project.
+@end direntry
+
+@iftex
+@set DOCUMENT book
+@set CHAPTER chapter
+@set SECTION section
+@set DARKCORNER @inmargin{@image{lflashlight,1cm}, @image{rflashlight,1cm}}
+@end iftex
+@ifinfo
+@set DOCUMENT Info file
+@set CHAPTER major node
+@set SECTION node
+@set DARKCORNER (d.c.)
+@end ifinfo
+@ifhtml
+@set DOCUMENT web page
+@set CHAPTER chapter
+@set SECTION section
+@set DARKCORNER (d.c.)
+@end ifhtml
+
+@set FN file name
+@set FFN File Name
+
+@c merge the function and variable indexes into the concept index
+@ifinfo
+@synindex fn cp
+@synindex vr cp
+@end ifinfo
+@iftex
+@syncodeindex fn cp
+@syncodeindex vr cp
+@end iftex
+
+@c If "finalout" is commented out, the printed output will show
+@c black boxes that mark lines that are too long. Thus, it is
+@c unwise to comment it out when running a master in case there are
+@c overfulls which are deemed okay.
+
+@iftex
+@finalout
+@end iftex
+
+@smallbook
+
+@set TITLE Workflow in the @command{gawk} project
+@set EDITION 0.0
+@set UPDATE-MONTH August, 2014
+@c gawk versions:
+@set VERSION 4.1
+@set PATCHLEVEL 0
+
+@copying
+This is Edition @value{EDITION} of @cite{@value{TITLE}},
+for the @value{VERSION}.@value{PATCHLEVEL} (or later) version of the GNU
+implementation of AWK.
+@sp 2
+Copyright (C) 2014, 2015 Free Software Foundation, Inc.
+@sp 2
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with the
+Invariant Sections being ``GNU General Public License'', the Front-Cover
+texts being (a) (see below), and with the Back-Cover Texts being (b)
+(see below). A copy of the license is included in the section entitled
+``GNU Free Documentation License''.
+
+@enumerate a
+@item
+The FSF's Back-Cover Text is: ``You have the freedom to
+copy and modify this GNU manual.''
+@end enumerate
+@end copying
+
+@ifinfo
+This file documents the workflow of the developers in the GNU
+@command{awk} project.
+
+@insertcopying
+@end ifinfo
+
+@setchapternewpage odd
+
+@titlepage
+@title @value{TITLE}
+@subtitle Edition @value{EDITION}
+@subtitle @value{UPDATE-MONTH}
+@author J@"urgen Kahrs
+@author with Arnold D. Robbins
+
+@c Include the Distribution inside the titlepage environment so
+@c that headings are turned off. Headings on and off do not work.
+
+@page
+@vskip 0pt plus 1filll
+@sp 2
+Published by:
+@sp 1
+
+Free Software Foundation @*
+51 Franklin Street, Fifth Floor @*
+Boston, MA 02110-1301 USA @*
+Phone: +1-617-542-5942 @*
+Fax: +1-617-542-2652 @*
+Email: @email{gnu@@gnu.org} @*
+URL: @uref{http://www.gnu.org/} @*
+
+ISBN 1-882114-93-0 @*
+
+@insertcopying
+
+@c @sp 2
+@c Cover art by ?????.
+@end titlepage
+
+@iftex
+@headings off
+@evenheading @thispage@ @ @ @strong{@value{TITLE}} @| @|
+@oddheading @| @| @strong{@thischapter}@ @ @ @thispage
+@end iftex
+
+@ifnottex
+@node Top
+@top Introduction
+@comment node-name, next, previous, up
+
+This file documents the workflow of the developers in the GNU Awk (@command{gawk})
+version 4.1 and later.
+
+@insertcopying
+@end ifnottex
+
+@menu
+* Introduction:: About networking.
+* Basics of GIT repositories:: The fundamental environment of
+ the developer.
+* Conventions used in the repository:: How to behave.
+* Tutorial for a first-time-gawk-contributor:: How to get started with least
+ pain.
+* FAQs and HOWTOs:: General recipes for daily work.
+* Links:: Where to find the stuff
+ mentioned in this document.
+* GNU Free Documentation License:: The license for this document.
+* Index:: The index.
+
+@detailmenu
+* Quick Start::
+* Setting up a proper @command{git} repository::
+* Pulling the latest changes from the remote repository::
+* Checking out a feature branch from the remote repository::
+* Semantics of Cloning:: What to
+ consider
+ before you
+ clone.
+* Local versus Remote:: Where my
+ source code
+ really is.
+* Tracking and Merging:: What the
+ others are
+ doing.
+* master::
+* stable::
+* feature::
+* who does what::
+* step-by-step instructions for a first-time-gawk-contributor::
+* step-by-step instructions for a first-time-gawk-administrator::
+* general recipes for daily work::
+* references and URLs to books and other texts::
+@end detailmenu
+@end menu
+
+@contents
+
+@node Introduction
+@chapter Introduction
+
+This @value{DOCUMENT} is meant to be a description of the working habits
+that were established for collaboration in the GNU Awk project.
+Such stuff tends to become rather dry, and to prevent you from getting
+bored at this early stage, we will begin this @value{CHAPTER} with a
+brief introduction that shows you how to get the
+source code of the GNU Awk project compiled on your machine.
+
+We do this in order to get you motivated to follow us through the later
+steps that consist mainly of conceptual considerations.
+We hope that (in later, more abstract steps) you will always remember
+this down-to-earth introduction, should you ever wonder what all the
+later bizarre trickery is good for.
+
+@menu
+* Quick Start::
+* Setting up a proper @command{git} repository::
+* Pulling the latest changes from the remote repository::
+* Checking out a feature branch from the remote repository::
+@end menu
+
+@node Quick Start
+@section Quick Start: Compiling @command{gawk} in 5 Minutes
+
+The following steps will look familiar to you; they are not that much
+different from the steps you used in the old days when you downloaded
+a tar ball, extracted it and compiled the source code. It is mainly
+the very first step that looks different; instead of downloading the
+tar ball you need the tool @command{git}.@footnote{If the command
+@command{git} does not exist on your machine,
+you need adminstrator privileges to install it. By convention, the
+command is usually part of an installation package by the same name.}
+
+@example
+git clone git://git.savannah.gnu.org/gawk.git
+cd gawk
+git checkout gawk-4.1-stable
+./bootstrap.sh
+./configure
+make
+./gawk --version
+@end example
+
+There are two differences to your working habits. In the third step,,
+you have to extract (or @dfn{check out}) the @code{gawk-4.1-stable} branch of the current source
+code (there are other branches available, that's the point where
+things get interesting).
+
+In the fourth step, you must run the @command{bootstrap.sh} script in
+order to set correctly timestamps on various files. Doing this is essential;
+it allows you to avoid having to install the correct versions of the
+various autotools as used by the @command{gawk} maintainer.
+
+Isn't this simple? No, it's not that simple.
+If you plan to go any further (for example compile the source
+code again next week, including next week's latest update), you will
+need to know what's going on when you use this seemingly simple
+@command{git} command (and that's the point where things get bizarre).
+
+In the next @value{CHAPTER} you will find a more thorough conceptual
+explanation, here we are satisfied with getting to know the practical
+steps necessary to get a working environment going that you can use
+in your daily work in a reliable way.
+
+@node Setting up a proper @command{git} repository
+@section Setting up a proper @command{git} repository
+
+After the initial @emph{checkout} you have access to all the source code
+files that the maintainers have pushed through the official release procedure.
+
+You may not have noticed, but each change is well documented and traceable.
+This process of tracing the change history is so precise, reproducable and
+fine-grained that any dubious change may be kicked out later and the author
+of dubious stuff identified by name and change date.
+
+Some bookkeeping is
+necessary for this and that's why you need @command{git}. @command{git}
+does all this for you. Developers who have used @command{svn} or
+@command{cvs} in the past will not be surprised to hear that each change
+is traceable precisely (they know that @command{svn} and @command{cvs}
+can do this, too).
+
+But the first-time user of @command{git} (as well as the @command{svn} user)
+may still have failed to notice what he actually did earlier in this @value{CHAPTER}.
+It is not just a mere copy of the source code that you created,
+it is a full copy of the entire @dfn{upstream} repository server that you created
+(or @dfn{cloned}). This means that others could make their own copy of
+@emph{your} repository and treat it as @emph{their upstream} repository.
+
+This is the essential difference between working with @command{svn} and
+working with @command{git}: by @emph{cloning} you become a repository
+administrator, whether you like it or not. As such you have some duties that
+go beyond the duties of an @command{svn} user. For example, you have to
+identify yourself properly as the owner of the repository by setting
+some global variables identifying you. The global settings will be used
+every time you connect again to the upstream repository.
+
+@smallexample
+git config --global user.name "@var{First-Name Last-Name}"
+git config --global user.email @var{email@@address.site}
+git config --global color.ui auto
+@end smallexample
+
+You may leave these variables unset, but then you are reduced to an
+anonymous consumer-only behaviour whenever you connect to the upstream
+repository. Later you will learn that there are many other variables
+to be set, most of them serving as defaults that can be overridden if
+you like. Choosing to work with defaults makes work quick and easy for the most frequent
+use cases, but that comes at a cost: With so many helpful defaults
+you may be overwhelmed by the detail and complexity of the real inner working.
+Here is an example of one of the author's configuration variables:
+
+@smallexample
+$ @kbd{git config --list}
+@print{} user.name=First-Name Last-Name
+@print{} user.email=email@@address.site
+@print{} color.diff=auto
+@print{} color.status=auto
+@print{} color.branch=auto
+@print{} gui.spellingdictionary=en_US
+@print{} core.repositoryformatversion=0
+@print{} core.filemode=true
+@print{} core.logallrefupdaIsn't this simple? No, it's not that simple. tes=true
+@print{} remote.origin.fetch=+refs/heads/*:refs/remotes/origin/*
+@print{} remote.origin.url=ssh://jkahrs@@git.sv.gnu.org/srv/git/gawk.git
+@print{} branch.master.remote=origin
+@print{} branch.master.merge=refs/heads/master
+@print{} branch.xgawk_load.remote=origin
+@print{} branch.xgawk_load.merge=refs/heads/xgawk_load
+@end smallexample
+
+Changing these variables with specialized variants of the @command{git} command
+may seem awkward to you and perhaps you prefer to use your favourite text editor
+to overview and change the variables. That's easy: edit the file @file{.git/config}.
+
+@smallexample
+$ @kbd{cat .git/config}
+@print{} [core]
+@print{} repositoryformatversion = 0
+@print{} filemode = true
+@print{} bare = false
+@print{} logallrefupdates = true
+@print{} [remote "origin"]
+@print{} fetch = +refs/heads/*:refs/remotes/origin/*
+@print{} url = ssh://jkahrs@@git.sv.gnu.org/srv/git/gawk.git
+@print{} [branch "master"]
+@print{} remote = origin
+@print{} merge = refs/heads/master
+@print{} [branch "cmake"]
+@print{} remote = origin
+@print{} merge = refs/heads/cmake
+@end smallexample
+
+Now you can see how variables are structured group-wise.
+But wait, where is the e-mail address in this list of variables?
+It is missing in the file @file{.git/config} because that file
+contains only the local settings of this one repository
+(while there may be others on your machine).
+The e-mail address is a variable of a more general kind that
+should be stored above all the repositories.
+These are referred to as the @dfn{global} variables:
+
+@smallexample
+$ @kbd{git config --list --global}
+@print{} user.name=First-Name Last-Name
+@print{} user.email=email@@address.site
+@print{} color.diff=auto
+@print{} color.status=auto
+@print{} color.branch=auto
+@print{} gui.spellingdictionary=en_US
+@end smallexample
+
+If you wonder whether there is a parameter @command{--local} to list
+the local variables, then you should look into the well-structured
+man pages of @command{git}. The level of detail may overwhelm you,
+but one day you might appreciate it.
+
+@smallexample
+git help config
+@end smallexample
+
+@node Pulling the latest changes from the remote repository
+@section Pulling the latest changes from the remote repository
+
+Whether you set any of these variables or not, sooner or later you will want
+to catch up with the changes that happened in the upstream repository.
+So, how can you update your copy of the repository and re-build the source code?
+The easiest way is to rely on defaults and use the @emph{pull} command to request
+updates from the upstream repository:
+
+@smallexample
+git pull
+./bootstrap.sh
+./configure
+make
+@end smallexample
+
+When using the @emph{pull} command, all the changes available in all branches of
+the upstream repository will be copied (and merged) into your local repository.
+We assume here that we still have the @emph{gawk-4.1-stable} branch checked out (as described earlier)
+and we are not interested in changes to other existing branches.
+The merging of changes will be done inside the branches only, so that changes in one
+branch are kept inside this branch and don't mix up other branches.
+
+@c ========================================
+
+But @emph{what is a branch?} you may wonder. It is the name given to a sequence of changes
+that were made to the master branch outside the master branch.
+It is easy to look up all the available branches
+(the names of the change sequences) in the remote upstream repository.
+
+@smallexample
+$ @kbd{git branch -a}
+@print{} * master
+@print{} remotes/origin/cmake
+@end smallexample
+
+The asterisk in front of the branch name assures you of the fact that you see
+the source files as they are in the @emph{master} branch.
+
+@node Checking out a feature branch from the remote repository
+@section Checking out a feature branch from the remote repository
+
+It is also easy to
+have a look at other branches, for example when you are interested in what is
+going on in a certain @emph{feature branch} that the maintainer set up recently
+for a new feature to be developed separately (so that others can go on undisturbed).
+
+@smallexample
+$ @kbd{git checkout origin/cmake}
+$ @kbd{git branch -a}
+@print{} master
+@print{} * remotes/origin/cmake
+$ @kbd{./bootstrap.sh}
+$ @kbd{./configure}
+$ @kbd{make}
+@end smallexample
+
+When you try this, take care that you have not changed anything in any source file.
+@command{git} would notice changes and refuse to checkout the other branch.
+This is meant to protect you from losing any local changes that you forgot to save.
+Any source file that is part of the repository and gets generated during the build
+in a slightly different way than the original would cause such a problem.
+
+@smallexample
+$ @kbd{git status}
+@print{} # On branch master
+@print{} # Changes not staged for commit:
+@print{} # awkgram.c
+@end smallexample
+
+Here we have @file{awkgram.c} that was generated from @file{awkgram.y}.
+But what was generated differently in the file?
+
+@smallexample
+git diff awkgram.c
+@end smallexample
+
+Ok, you are not interested in textual changes to the copyright notice
+that are only due to a new calendar year. You are also not interested
+in the internals of the generated parser and only wonder
+@emph{How do we get back the original file from the repository?}
+
+@smallexample
+$ @kbd{git checkout awkgram.c}
+$ @kbd{git diff awkgram.c | wc -l}
+@print{} 0
+@end smallexample
+
+After checking the file out once more, there is obviously no difference
+to the copy saved in the repository. But let's not get distracted, we
+wanted to find out what was going on in this feature branch. We can
+find out by asking @command{git} what has changed in the file @file{ChangeLog}
+of this feature branch relative to the master branch.
+
+@smallexample
+git diff origin/master ChangeLog
+@end smallexample
+
+@noindent
+This produces:
+
+@smallexample
+diff --git a/ChangeLog b/ChangeLog
+index eab657c..a499ec5 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,81 +1,3 @@
+-2014-09-07 Arnold D. Robbins <arnold@@skeeve.com>
+-
+- * awk.h: Move libsigsegv stuff to ...
+- * main.c: here. Thanks to Yehezkel Bernat for motivating
+- the cleanup.
+- * symbol.c (make_symbol, install, install_symbol): Add const to
+- first parameter. Adjust decls and fix up uses.
+@end smallexample
+
+Looks like a minor cleanup operation in the master branch that has not
+yet been merged into the feature branch. We still don't know what is new
+in this feature branch, how can we know? By looking at all changes that exist.
+
+@smallexample
+$ @kbd{git diff origin/master --numstat}
+@print{} 0 78 ChangeLog
+@print{} 8 3 README_d/README.cmake
+@end smallexample
+
+On your screen you see a list of all differences between the currently
+checked-out branch and the master branch. It tells you the names of the
+files that have changed, along with the number of added and deleted lines.
+Now we can have a closer look at who changed what.
+Let's single out one particular file that looks interesting.
+As usual there is a @command{diff} sub-command to list all the changed
+lines, but there is also a @command{blame} sub-command that tells you
+who made the last change to any of the lines.
+
+@smallexample
+git blame README_d/README.cmake
+@end smallexample
+
+@noindent
+This produces (in part):
+
+@smallexample
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 1) CMake is a build automation system
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 2) http://en.wikipedia.org/wiki/Cmake
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 3)
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 4) We try to use it as a replacement for the established GNU build system.
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 5) This attempt is currently only experimental. If you wonder why anyone
+2092a35f (Juergen Kahrs 2014-08-12 17:11:20 +0200 6) should do this, read
+@end smallexample
+
+The strange number on the left margin is the short form of a numerical
+identifier of the change set. At the moment you can safely ignore it,
+but this number is the key you need in case you should ever want to
+cherry-pick some change sets. But cherry-picking is still far away,
+before you can do this, you have to learn how to make changes to your
+local repository and @command{push} them to the upstream repository.
+Some conceptual basics are needed for understanding this essential part
+of the workflow.
+
+@node Basics of GIT repositories
+@chapter Basics of GIT repositories
+
+@menu
+* Semantics of Cloning:: What to consider before you clone.
+* Local versus Remote:: Where my source code really is.
+* Tracking and Merging:: What the others are doing.
+@end menu
+
+@c http://iverilog.wikia.com/wiki/Installation_Guide
+@c http://www.linuxjournal.com/article/2840
+@c http://git-scm.com/book/en/Git-Branching-Branching-Workflows
+@c https://www.atlassian.com/en/git/workflows
+@c https://help.github.com/articles/what-is-a-good-git-workflow
+@c https://guides.github.com/introduction/flow/index.html
+@c http://supercollider.sourceforge.net/wiki/index.php/Developer_cheatsheet_for_git
+@c http://savannah.gnu.org/maintenance/UsingGit/
+@c http://www.emacswiki.org/emacs/GitForEmacsDevs
+
+What is tracking ?
+
+@display
+- How can I use git to contribute source code ?
+You need an account at Savannah. Read this to understand the first steps:
+ http://savannah.gnu.org/maintenance/UsingGit
+ README.git
+Use your account there to register your public ssh key at Savannah.
+Then you are ready to checkout. Remember that (when cloning) you are
+setting up your own local repository and make sure you configure it
+properly.
+ git clone ssh://my_account_name@@git.sv.gnu.org/srv/git/gawk.git
+@end display
+
+@node Semantics of Cloning
+@section Semantics of Cloning
+
+@node Local versus Remote
+@section Local versus Remote
+
+@node Tracking and Merging
+@section Tracking and Merging
+
+@node Conventions used in the repository
+@chapter Conventions used in the repository
+
+@menu
+* master::
+* stable::
+* feature::
+* who does what::
+@end menu
+
+@node master
+@section master
+
+@node stable
+@section stable
+
+@node feature
+@section feature
+
+@node who does what
+@section who does what
+
+@node Tutorial for a first-time-gawk-contributor
+@chapter Tutorial for a first-time-gawk-contributor
+
+@menu
+* step-by-step instructions for a first-time-gawk-contributor::
+* step-by-step instructions for a first-time-gawk-administrator::
+@end menu
+
+@node step-by-step instructions for a first-time-gawk-contributor
+@section step-by-step instructions for a first-time-gawk-contributor
+
+@node step-by-step instructions for a first-time-gawk-administrator
+@section step-by-step instructions for a first-time-gawk-administrator
+
+@c e-mail from Arnold 2014-08.24
+@c Thanks to Michal for pointing us in the right direction!
+@c I see this:
+@c
+@c bash-4.2$ git config --get push.default
+@c simple
+@c
+@c What does yours say?
+@c
+@c It appears that "simple" will be the default in version 2.0:
+@c
+@c From:
+@c http://blog.nicoschuele.com/posts/git-2-0-changes-push-default-to-simple
+@c
+@c Matching
+@c
+@c The 'matching' option is the default behavior in Git 1.x. It means that if you do a git push without specifying a branch, it will push all your local branches to their matching ones on your remote repository.
+@c
+@c Simple
+@c
+@c The new default in Git 2.x is 'simple'. It means that when doing a git push without specifying a branch, only your current branch will be pushed to the one git pull would normally get your code from."
+@c
+@c So this must explain it. I'll bet yours is set to "matching". I have no
+@c idea how mine got set to "simple", since I don't recall doing that.
+@c
+@c In the future, I will simply make sure to push before switching branches.
+@c I think I actually prefer that behavior, since it's more intuitive to me.
+
+
+@node FAQs and HOWTOs
+@chapter FAQs and HOWTOs
+
+@menu
+* general recipes for daily work::
+@end menu
+
+@node general recipes for daily work
+@section general recipes for daily work
+
+@node Links
+@chapter Links
+
+@menu
+* references and URLs to books and other texts::
+@end menu
+
+@node references and URLs to books and other texts
+@section references and URLs to books and other texts
+
+@c The GNU Free Documentation License.
+@node GNU Free Documentation License
+@unnumbered GNU Free Documentation License
+@cindex FDL (Free Documentation License)
+@cindex Free Documentation License (FDL)
+@cindex GNU Free Documentation License
+@center Version 1.3, 3 November 2008
+
+@c This file is intended to be included within another document,
+@c hence no sectioning command or @node.
+
+@display
+Copyright @copyright{} 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
+@uref{http://fsf.org/}
+
+Everyone is permitted to copy and distribute verbatim copies
+of this license document, but changing it is not allowed.
+@end display
+
+@enumerate 0
+@item
+PREAMBLE
+
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+
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+A section ``Entitled XYZ'' means a named subunit of the Document whose
+title either is precisely XYZ or contains XYZ in parentheses following
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+
+The Document may include Warranty Disclaimers next to the notice which
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+implication that these Warranty Disclaimers may have is void and has
+no effect on the meaning of this License.
+
+@item
+VERBATIM COPYING
+
+You may copy and distribute the Document in any medium, either
+commercially or noncommercially, provided that this License, the
+copyright notices, and the license notice saying this License applies
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+
+You may also lend copies, under the same conditions stated above, and
+you may publicly display copies.
+
+@item
+COPYING IN QUANTITY
+
+If you publish printed copies (or copies in media that commonly have
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+
+If the required texts for either cover are too voluminous to fit
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+
+If you publish or distribute Opaque copies of the Document numbering
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+
+It is requested, but not required, that you contact the authors of the
+Document well before redistributing any large number of copies, to give
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+
+@item
+MODIFICATIONS
+
+You may copy and distribute a Modified Version of the Document under
+the conditions of sections 2 and 3 above, provided that you release
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+Version filling the role of the Document, thus licensing distribution
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+
+@enumerate A
+@item
+Use in the Title Page (and on the covers, if any) a title distinct
+from that of the Document, and from those of previous versions
+(which should, if there were any, be listed in the History section
+of the Document). You may use the same title as a previous version
+if the original publisher of that version gives permission.
+
+@item
+List on the Title Page, as authors, one or more persons or entities
+responsible for authorship of the modifications in the Modified
+Version, together with at least five of the principal authors of the
+Document (all of its principal authors, if it has fewer than five),
+unless they release you from this requirement.
+
+@item
+State on the Title page the name of the publisher of the
+Modified Version, as the publisher.
+
+@item
+Preserve all the copyright notices of the Document.
+
+@item
+Add an appropriate copyright notice for your modifications
+adjacent to the other copyright notices.
+
+@item
+Include, immediately after the copyright notices, a license notice
+giving the public permission to use the Modified Version under the
+terms of this License, in the form shown in the Addendum below.
+
+@item
+Preserve in that license notice the full lists of Invariant Sections
+and required Cover Texts given in the Document's license notice.
+
+@item
+Include an unaltered copy of this License.
+
+@item
+Preserve the section Entitled ``History'', Preserve its Title, and add
+to it an item stating at least the title, year, new authors, and
+publisher of the Modified Version as given on the Title Page. If
+there is no section Entitled ``History'' in the Document, create one
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+given on its Title Page, then add an item describing the Modified
+Version as stated in the previous sentence.
+
+@item
+Preserve the network location, if any, given in the Document for
+public access to a Transparent copy of the Document, and likewise
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+least four years before the Document itself, or if the original
+publisher of the version it refers to gives permission.
+
+@item
+For any section Entitled ``Acknowledgements'' or ``Dedications'', Preserve
+the Title of the section, and preserve in the section all the
+substance and tone of each of the contributor acknowledgements and/or
+dedications given therein.
+
+@item
+Preserve all the Invariant Sections of the Document,
+unaltered in their text and in their titles. Section numbers
+or the equivalent are not considered part of the section titles.
+
+@item
+Delete any section Entitled ``Endorsements''. Such a section
+may not be included in the Modified Version.
+
+@item
+Do not retitle any existing section to be Entitled ``Endorsements'' or
+to conflict in title with any Invariant Section.
+
+@item
+Preserve any Warranty Disclaimers.
+@end enumerate
+
+If the Modified Version includes new front-matter sections or
+appendices that qualify as Secondary Sections and contain no material
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+of these sections as invariant. To do this, add their titles to the
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+
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+
+You may add a passage of up to five words as a Front-Cover Text, and a
+passage of up to 25 words as a Back-Cover Text, to the end of the list
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+permission from the previous publisher that added the old one.
+
+The author(s) and publisher(s) of the Document do not by this License
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+imply endorsement of any Modified Version.
+
+@item
+COMBINING DOCUMENTS
+
+You may combine the Document with other documents released under this
+License, under the terms defined in section 4 above for modified
+versions, provided that you include in the combination all of the
+Invariant Sections of all of the original documents, unmodified, and
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+
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+multiple identical Invariant Sections may be replaced with a single
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+adding at the end of it, in parentheses, the name of the original
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+Make the same adjustment to the section titles in the list of
+Invariant Sections in the license notice of the combined work.
+
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+in the various original documents, forming one section Entitled
+``History''; likewise combine any sections Entitled ``Acknowledgements'',
+and any sections Entitled ``Dedications''. You must delete all
+sections Entitled ``Endorsements.''
+
+@item
+COLLECTIONS OF DOCUMENTS
+
+You may make a collection consisting of the Document and other documents
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+
+@item
+AGGREGATION WITH INDEPENDENT WORKS
+
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+
+@item
+TRANSLATION
+
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+
+@item
+TERMINATION
+
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+
+@item
+FUTURE REVISIONS OF THIS LICENSE
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+provided the MMC is eligible for relicensing.
+
+@end enumerate
+
+@c fakenode --- for prepinfo
+@unnumberedsec ADDENDUM: How to use this License for your documents
+
+To use this License in a document you have written, include a copy of
+the License in the document and put the following copyright and
+license notices just after the title page:
+
+@smallexample
+@group
+ Copyright (C) @var{year} @var{your name}.
+ Permission is granted to copy, distribute and/or modify this document
+ under the terms of the GNU Free Documentation License, Version 1.3
+ or any later version published by the Free Software Foundation;
+ with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
+ Texts. A copy of the license is included in the section entitled ``GNU
+ Free Documentation License''.
+@end group
+@end smallexample
+
+If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
+replace the ``with@dots{}Texts.'' line with this:
+
+@smallexample
+@group
+ with the Invariant Sections being @var{list their titles}, with
+ the Front-Cover Texts being @var{list}, and with the Back-Cover Texts
+ being @var{list}.
+@end group
+@end smallexample
+
+If you have Invariant Sections without Cover Texts, or some other
+combination of the three, merge those two alternatives to suit the
+situation.
+
+If your document contains nontrivial examples of program code, we
+recommend releasing these examples in parallel under your choice of
+free software license, such as the GNU General Public License,
+to permit their use in free software.
+
+@c Local Variables:
+@c ispell-local-pdict: "ispell-dict"
+@c End:
+
+
+@node Index
+@comment node-name, next, previous, up
+
+@unnumbered Index
+@printindex cp
+@bye
+
+Conventions:
+1. Functions, built-in or otherwise, do NOT have () after them.
+2. Gawk built-in vars and functions are in @code. Also program vars and
+ functions.
+3. HTTP method names are in @code.
+4. Protocols such as echo, ftp, etc are in @samp.
+5. URLs are in @url.
+6. All RFCs in the index. Put a space between `RFC' and the number.