* src/wordsplit.c (_WSNF_DELIM): New node flag
(wsnode_flagstr): Print 'd' for that flag.
(expvar): Don't set WRDSF_WS when expanding variable
value. This fixes, e.g., expansion of a$x if x begins with
a whitespace.
(wsnode_nullelim): A _WSNF_DELIM node breaks join chain.
(wordsplit_trimws): Don't affect nodes within join chains.
(scan_word): Set _WSNF_DELIM for returned delimiters.
* tests/wordsplit.at (TESTWSP): 8th argument - prologue
shell code. Use it to unset environment variables in
env/getenv tests.
Test ws elimination with return_delims set.
* src/wordsplit.c: Implement default assignment, word
expansion in variable defaults, distinction between
${variable:-word} and ${variable-word}.
* doc/wordsplit.3: New file.
* src/wordsplit.h (wordsplit)<ws_envbuf,ws_envidx>
<ws_envsiz>: New members.
(WRDSF_ARGV): Remove.
(WRDSF_OPTIONS): New flag.
(WRDSO_ARGV): New option bit.
* tests/wordsplit.at: Add new tests.
* tests/wsp.c: Set WRDSF_OPTIONS flag if one of the options is requested.
* src/wordsplit.c (wordsplit_tildexpand)
(wordsplit_pathexpand): New functions.
(wordsplit_process_list): Run tilde and pathname expansion
if WRDSF_PATHEXPAND flag is set.
* src/wordsplit.h (wordsplit)<ws_options>: New member.
(WRDSF_PATHEXPAND): New flag.
(WRDSO_NULLGLOB,WRDSO_FAILGLOB)
(WRDSO_DOTGLOB): New defines.
* tests/wsp.c: New options pathexpand, nullglob, failglob,
dotglob. Fix help output.
* src/wordsplit.c (_wsplt_seterr): New static function. Use instead
of assigning value to ws_errno.
(coalesce_segment): Propagate _WSNF_QUOTE flag to the resulting node.
(wordsplit_process_list): Coalesce the list before running
command expansion.
* tests/testsuite.at: Test wordsplit first. If it fails, most other
tests will fail too.
* tests/wordsplit.at: Test command expansion.
New invocation sequence ensures proper error handling.
This is an incompatible change. Authors using ws_getvar member will
have to rewrite their ws_getvar function accordingly.
* src/wordsplit.c (wordsplit_init0): Call wordsplit_clearerr
on reuse.
(wordsplit_init): Fix ws_errno
(expvar): Change invocation of ws_getvar.
(expcmd): Change invocation of ws_command.
(wordsplit_clearerr): New function.
(wordsplit_strerror): Handle WRDSE_USERERR.
* src/wordsplit.h (ws_getvar): Change return value and signature of
ws_getvar and ws_command.
New member 'ws_usererr'.
(WRDSF_ARGV): New flag.
(WRDSE_OK): New define. Same as WRDSE_EOF.
(WRDSE_USERERR): New error code.
(wordsplit_clearerr): New proto.
* tests/wsp.c (wsp_getvar, wsp_runcmd): Rewrite.
* src/wordsplit.c (wordsplit_init): Change handling of lacking
WRDSF_NOCMD.
(find_closing_cbrace): Rename to find_closing_paren, take additional
argument. All uses changed.
(node_expand_vars): Rewrite as a generalized function node_expand.
(wordsplit_varexp): Use node_expand.
(expcmd, wordsplit_cmdexp): New functions.
(scan_word): Handle $(command) notation
(wordsplit_process_list): Command expansion.
* src/wordsplit.h (wordsplit) <ws_command>: New member.
* tests/wsp.c (wsp_runcmd): New function.
(main): Set ws_command unless WRDSF_NOCMD flag is set.
* tests/wsp.c (help): Update.
(wsp_getvar): New function.
(main): Callect all arguments in form X=Y to an array
and set ws_getvar member if this array is not empty.
* tests/wordsplit.at: Add tests for ws_getenv function.
* src/wordsplit.c (expvar): Ensure value is set.
Pass WRDSF_QUOTE to wordsplit
(scan_word): Treat ${...} as a single word.
* tests/wordsplit.at: Add more tests.
* tests/wsp.c: Fix error message.
* src/wordsplit.c (ISVARBEG,ISVARCHR): New macros.
(expvar): ws_getvar allocates memory.
* src/wordsplit.h (wordsplit)<ws_getvar>: Remove const
from the return value: the function should allocate memory.
