* gash/arithmetic.scm: New file.
* Makefile.am (SOURCES): Add it.
* gash/lexer.scm (get-arithmetic-expansion): New procedure.
(get-expansion): Check for "$((" and use the new procedure to read an
arithmetic expansion.
* gash/eval.scm (word->qword): Handle '<sh-arithmetic>'.
* tests/unit/eval.scm: Add tests.
* tests/spec/Makefile.am (TESTS): Add 'arith'.
* tests/spec/oil.scm: Patch seven of its tests and filter out fifteen
others.
* doc/gash.texi, doc/syntax.txt: Add '<sh-arithmetic>' syntax.
* gash/lexer.scm (read-backquoted-command): Make the default procedure
accept a 'quoted?' keyword.
(get-backquoted-command): Accept a 'quoted?' keyword and pass it on to
'read-backquoted-command'.
(get-expansion): Accept a 'quoted?' keyword and pass it on to
'get-backquoted-command'.
(get-double-quotation): Set the 'quoted?' keyword when calling
'get-expansion'.
* tests/unit/lexer.scm: Add tests.
* gash/parser.scm (call-with-backquoted-input-port): Accept a
'quoted?' keyword which, if set, adds the double quote character to
the set of escapable characters.
(read-sh/backquoted): Accept a 'quoted?' keyword and pass it on to
'call-with-backquoted-input-port'.
* tests/unit/parser.scm: Add tests.
* configure.ac (GUILE_PKG): Add 2.0.
* gash/textual-ports.scm: New file.
* Makefile.am: Add it.
* gash/lexer.scm, gash/parser.scm, gash/shell.scm: Use it in place of
'(ice-9 textual-ports)'.
* tests/unit/shell.scm: Use it in place of '(ice-9 textual-ports)';
replace '(ice-9 textual-ports)' with '(rnrs io ports)' in sub-scripts;
and add a shim for 'setvbuf'.
gash/environment.scm: Remove file.
geesh/*: Move these files into the 'gash' folder and replace all
instances of the word 'geesh'.
scripts/geesh.in: Remove file.
HACKING, INSTALL, Makefile.am, configure.ac, guix.scm,
tests/bootstrap/bash-without-bash.scm, tests/spec/Makefile.am,
tests/spec/check-spec, tests/spec/oil.scm, tests/unit/*,
tools/coverage.in: Replace all instances of the word 'geesh'.
Co-authored-by: Jan Nieuwenhuizen <janneke@gnu.org>
Timothy Sample