gbranden pushed a commit to branch master
in repository groff.
commit 4c73a8478435244f1ea8c9e5289943ad342a3e0c
Author: G. Branden Robinson <[email protected]>
AuthorDate: Thu Dec 18 17:15:02 2025 -0600
contrib/chem/README.txt: Recast.
---
contrib/chem/README.txt | 44 ++++++++++++++++++++++----------------------
1 file changed, 22 insertions(+), 22 deletions(-)
diff --git a/contrib/chem/README.txt b/contrib/chem/README.txt
index 7a986ef83..1f0207f6e 100644
--- a/contrib/chem/README.txt
+++ b/contrib/chem/README.txt
@@ -1,25 +1,25 @@
-chem is a roff language to generate chemical structure diagrams.
-'@g@chem' is a 'groff' preprocessor that produces output suitable for
-the '@g@pic' preprocessor.
-
-The original version of chem is an awk script written by Brian
-Kernighan <http://cm.bell-labs.com/cm/cs/who/bwk/index.html>. The
-source files of the awk version of chem are available at
-<http://cm.bell-labs.com/netlib/typesetting/chem.gz>.
-
-This project is a rewrite of chem in Perl for the GNU roff project
-'groff'. It was written under Perl v5.8.8, but at least Perl v5.6 is
-needed to run the Perl version of chem.
-
-In comparison to the original awk version of chem, the Perl
-version does the following changements:
-- the options -h, --help, -v, --version to output usage and version
-information are added.
-- remove some functions 'inline', 'shiftfields', and 'set' and some
-variables that are used only once.
-
-The subdirectory 'examples/' contains example files for chem. They
-are written in the chem language. The file names end with .chem.
+chem is a preprocessor for *roff formatters that generates chemical
+structure diagrams in the pic language.
+
+The original version of chem is an AWK script written by Brian
+Kernighan, formerly sited at <http://cm.bell-labs.com/cm/cs/who/bwk/
+ndex.html>. Historically, the source files of the AWK version of chem
+are available at <http://cm.bell-labs.com/netlib/typesetting/chem.gz>.
+
+This project is a rewrite in Perl of the AWK version of chem for groff,
+the GNU roff project. It was written using Perl v5.8.8, but at least
+Perl v5.6 is needed to run this Perl version of chem.
+
+In comparison to the original AWK version of chem, this Perl version
+makes the following changes.
+
+- Adds options -h, --help, -v, and --version to output usage and version
+ information.
+- Removes some functions "inline", "shiftfields", and "set", and some
+ variables that are used only once.
+
+The subdirectory "examples/" contains example files for chem. They are
+written in the chem language. The file names end with .chem.
####### License
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