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* doc: improve.Paul A. Patience2021-08-141-129/+136
| | | | | | | | | | | | * RELNOTES: Fix various minor issues and stylistic issues. * configure: Remove repeated word and add missing word. * txr.1: Fix various minor, not-so-minor and stylistic issues. In particular, struct-from-args was misspelled in the .mets line and open-subprocess was missing from the .coNP line. * stdlib/doc-syms.tl: Updated.
* matcher: new must-match and must-match-case macros.Kaz Kylheku2021-08-131-3/+28
| | | | | | | | | | | | | * lisplib.c (match_set_entries): Intern the match-error symbol. Register autoloads for must-match and must-match-case. * stdlib/match.tl (match-error): Register exception symbol, as subtype of match-error. (must-match, must-match-case): New macros. * tests/011/patmatch.tl: Test cases. * txr.1: Documented.
* Version 268.txr-268Kaz Kylheku2021-08-071-3/+3
| | | | | | | | | | | | | | * RELNOTES: Updated. * configure (txr_ver): Bumped version. * stdlib/ver.tl (lib-version): Bumped. * txr.1: Bumped version and date. * txr.vim, tl.vim: Regenerated. * protsym.c: Likewise.
* lazy-stream-cons: control close throwing behavior.Kaz Kylheku2021-08-071-4/+35
| | | | | | | | | | | | | | | | | | | | | | | | | * eval.c (eval_init): Update registrations of lazy-stream-cons and get-lines with one more optional argument. * lib.c (simple_lazy_stream_func_nt, lazy_stream_func_nt): New static functions. (lazy_stream_cons): Take a new argument, no_throw_close, defaulting it to nil. When calling close_stream directly, pass the inverted value of no_throw_close. Choose the new _nt functions for the lazy list if no_throw_close is true; those functions pass nil as the second argument of close_stream. * lib.h (lazy_stream_cons): Declaration updated. * match.c (v_next_impl, open_data_source, match_fun): Pass down the nothrow value to lazy_stream_cons, or else nil in situations when that is not applicable or there is no such value. Thus the :nothrow feature of v_next will now not only ensure that there is no exception when opening the stream but also when closing it. Unusual situations encountered when the lazy list reads from the stream still throw. * txr.1: Documented.
* doc: document nested do.Kaz Kylheku2021-08-061-0/+55
| | | | * txr.1: Document do being applied to do/op.
* txr: @(eof) takes argument for binding termination status.Kaz Kylheku2021-08-051-1/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | We extend the matching context structures to keep track of the underlying stream from which lines are being taken via the lazy list. Then the implementation of the @(eof) directive, when it hits the eof condition, can use this stream to gain access to the termination status. * match.c (match_line_ctx, match_files_ctx): New member, stream. (ml_all): Take stream argument and initialize new member. (h_call, do_match_line): Pass stream argument to h_call. (mf_all, mf_file_data): Take stream argument and initialize new member. (mf_from_ml): Propagate stream from line context to file context. (freeform_prepare, v_next_impl, match_filter, match_fun, extract): Pass stream argument where now needed. (v_eof): Implement termination status binding via the stream stored in the context. (open_data_source): Store stream in match files context. * tests/010/eof-status.txr: New file. * tests/010/eof-status.expected: New file. * Makefile (tst/tests/010/eof-status.ok): -B option for new test. * txr.1: Documented eof directive, argument and all. * stdlib/doc-syms.tl: Updated.
* close-stream: make idemponent.Kaz Kylheku2021-08-041-5/+5
| | | | | | | | | | | | | | | | | | * stream.c (strm_base_init): Add new element to the initializer to initialize the close_result member to nao, indicating that the close operation has not been invoked. (strm_base_mark): Mark the close_result value, if it isn't nao. This is just in case it is a heap object. The structure delegate mechanism opens the possibility that the stream is actually user code that can return anything so we have to be careful. (close_stream): Only call ops->close if close_result is nao, indicating that close had never been called (or possibly that it had been called bu threw an exception) and store the return value in close_result, otherwise return the previously stored value. * stream.h (struct strm_base): New member, close_result. * txr.1: Documented.
* listener: print prompts in plain mode if stdin is tty.Kaz Kylheku2021-08-031-8/+5
| | | | | | | * linenoise/linenoise.c (linenoise): Force the printing of prompts if the input file descriptor is a tty. * txr.1: Documentation updated.
* listener: prompt feature for plain mode.Kaz Kylheku2021-08-031-2/+12
| | | | | | | | | | | | | | | | | | The :prompt-on command will enable prompting in plain mode. * linenoise/linenoise.c (struct lino_state): New member, show_prompt. (line_enable_noninteractive_prompt): New function. (linenoise): In the plain mode loop, the show_prompt flag is on, show the prompt. For continuation lines, show a condensed prompt, which consists of the suffix of the full prompt, starting on the last non-whitespace character. * linenoise/linenoise.h (lino_enable_noninteractive): Declared. * parser.c (repl): Implement :prompt-on command which enables the above mode. * txr.1: Documented.
* streams: document redundant close-stream.Kaz Kylheku2021-08-021-0/+10
| | | | | * txr.1: Document that if close-stream is applied to a closed stream, then nil is returned without throwing an exception.
* streams: bad argument defaulting in close-stream.Kaz Kylheku2021-08-021-3/+3
| | | | | | | | | | | | | | | * stream.c (stdio_close, pipe_close): Fix throw_on_error argument not being defaulted correctly, so that errors are thrown even when the argument is omitted. * strudel.c (strudel_close): Here, we also must default the argument. The corresponding close method does not have an optional argument; it is mandatory. The documentation is bungled for it, though. * txr.1: Fix documentation of structure delegate streams with regard to the close method. It does not take offs and whence parametrs, but throw-on-error-p, which is mandatory.
* listener: support multi-line expressions in plain mode.Kaz Kylheku2021-08-011-0/+8
| | | | | | | | | | | | | * linenoise/linenoise.c (linenoise): If we are in noninteractive mode, then do not just read one line and return it. If an enter_callback is defined then keep accumulating lines while the callback indicates incomplete syntax, until EOF occurs or the syntax appears complete. Return the lines glued together, with \n characters replaced by \r, so the line is correctly entered into the history, and the trailing LF obliterated, as usual. * txr.1: Documented new multi-line behavior of plain mode.
* oop: fix infelicity in new* and lnew* macros.Kaz Kylheku2021-07-311-1/+72
| | | | | | | | | | * stdlib/struct.tl (sys:new-expander): If the argument of new* or lnew* is dwim, then treat that as an expression, rather than as a boa-style construction. * tests/012/oop.tl: Tests for new* focusing on this issue. * txr.1: Documented.
* doc: *read-bad-json* fix and doc-syms update.Kaz Kylheku2021-07-311-1/+1
| | | | | | * txr.1: Fix code -> codn. * stdlib/doc-syms.tl: Updated.
* parser: allow trailing commas in json, via opt-in flag.Kaz Kylheku2021-07-291-0/+24
| | | | | | | | | | | | | | | | | | | | | | | * parser.c (read_bad_json_s): New symbol variable. (parser_common_init): Propagate value of *read-bad-json* into read_bad_json flag in parser structure. (parser_init): Initialize read_bad_json_s and register the *read-bad-json* dynamic variable. * parser.h (struct parser): New member, read_bad_json. (read_bad_json_s): Declared. * parser.y (json_val): Support an opt_comma symbol just before the closing bracket or brace. (opt_comma): New nonterminal symbol. Recognizes ',' or nothing. Error is flagged if ',' is recognized, and *read-bad-json* is nil. * y.tab.c.shipped: Updated. * tests/010/json.tl: New tests. * txr.1: Documented.
* subtypep: handle struct type objects.Kaz Kylheku2021-07-271-6/+14
| | | | | | | | | | | | | The subtypep function has poor requirements, handling only type symbols. Let's extend it to handle structure type objects. * lib.c (subtypep): In all cases when an argument is considered to be a possible structure symbol, and thus subject to find_struct_type, consider whether it already is a struct type, and just take it as-is. * tests/012/type.tl: New tests. * txr.1: Updated.
* Version 267.txr-267Kaz Kylheku2021-07-261-3/+3
| | | | | | | | | | | | | | * RELNOTES: Updated. * configure (txr_ver): Bumped version. * stdlib/ver.tl (lib-version): Bumped. * txr.1: Bumped version and date. * txr.vim, tl.vim: Regenerated. * protsym.c: Likewise.
* hash: support both semantics of weak keys + values.Kaz Kylheku2021-07-211-13/+66
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Hash tables with weak keys and values now support a choice of both possible semantics: under and-semantics, an entry lapses when both the key and value are unreachable. Under or-semantics, an entry lapses if either the key or value is unreachable. The and-semantics is new. Until TXR 266, only or-semantics was supported. This will be the default: when a hash table is specified as :weak-keys and :weak-vals, it will have or-semantics. The keywords :weak-or and :weak-and specify weak keys and values, with the specific semantics. They are utually exclusive, but tolerate the presence of :weak-keys and :weak-vals. The make-hash function is being extended such that if its leftmost argument, <weak-keys>, is specified as one of the keywords :weak-and or :weak-or, then the hash table will have weak keys and values with the specified semantics, and the <weak-vals> argument is ignored (values are weak even if that argument is false). * eval.c (eval_init): Initially register the top_vb, top_mb, top_smb, special and builtin hashes as ordinary hashes: no weak keys or values. Then use tweak_hash to switch to weak keys+vals with and-semantics. We do it this way because the keywords are not yet initialized; we cannot use them. * hash.h (enum hash_flags, hash_flags_t): Moved to header. Member hash_weak_both renamed to hash_weak_or. New member hash_weak_and. (weak_and_k, weak_or_k): New keyword variables. (hash_print_op): Handle hash_weak_and by printing :weak-and. (hash_mark): Handle hash_weak_and by marking nothing, like hash_weak_or. (do_make_hash): Check first argument against the two new keywords and set flags accordingly. This function is called from eval_init before the keywords have been initialized, in which case weak_keys == weak_and_k is true when both are nil; we watch for that. (tweak_hash): Now returns void and takes a hash_flags_t argument which is simply planted. (do_wak_tables): Implement hash_weak_and case. Remove the compat 266 stuff from hash_weak_or. Compatibility is no longer required since we are not changing the default semantics of hash tables. Phew; that's a load of worry off the plate. (hashv): Parse the two new keywords, validate and provide semantics. (hash_init): Initialize weak_and_k and weak_or_k kewyords. * hash.h (enum hash_flags, hash_flags_t): Moved here now. (weak_and_k, weak_or_k): Declared. * lib.c (compat_fixup): Remove call to parse_compat_fixup. * parser.c (parse_init): Create stream_parser_hash with and-semantics. (parse_compat_fixup): Function removed. * parser.h (parse_compat_fixup): Declaration removed. * txr.1: Hash documentation updated.
* hash: change semantics of weak-both hash tables.Kaz Kylheku2021-07-201-3/+17
| | | | | | | | | | | | | | | | From now on, hash tables with both weak keys and values have dijunctive retention semantics. If either the key or value of an entry is reachable, then the entry stays. This is subject to compatibility. * hash.c (do_weak_tables): Expire an entry if neither the key nor the value is reachable. In 266 or lower compatibility mode, expire an entry if either the key or value is unreachable, like before. * txr.1: Document the change, with compat notes. Add a cautionary note about the referencing issue which defeats weak key or weak value tables.
* hash: revert bad fix in weak processing.Kaz Kylheku2021-07-201-7/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit reverts the April 11, 2020 commit a4c376979d15323ad729e92e41ba43768e8dc163, subject line "hash: bugfix: spurious retention in weak processing". That commit is a regression. This revert requires a follow-up; the commit was trying to fix an issue which now reappears. It will have to be fixed differently. The regression is that in a situation in which data is referenced through two or more dependent weak tables, entries that are reachable can spontaneously disappear from downstream tables. Suppose H0 and H1 are weak-key tables. Suppose the program holds a datum K0, which is the only reference through which D1 is reached, in the following chain: K0 -> [H0] -> K1 -> [H1] -> D1 K0 is a key in hash table H0, which has weak keys. The the associated value K1 is a key in H1, which then references D1. H0 holds the only reference to K1, and H1 holds the only reference to D1. During the first GC marking phase, because we do not mark any part of a table which has weak keys, when we process H0 we do not mark the value K1. Thus K1 looks unreachable. In the second weak hash processing pass, because K1 was treated as unreachable, the <K1, D1> entry in H1 is incorrectly expired. This issue affects TXR's origin_hash and form_to_ln_hash, which are in this relationship. The problem was uncovered in recent tags.tl work, manifesting as a spurious disappearance of line number info when processing .txr files. The line number info disappeared for entries which were traced through the origin_hash via the macro-ancestor function (see the unexpand function in tags.tl). * hash.c (hash_mark): Only skip marking tables that have both weak keys and values. For weak key tables, mark all the values and vice versa: for weak value tables, mark the keys. * txr.1: Text resembling original text restored.
* doc: warm-up-period argument of make-random-state.Kaz Kylheku2021-07-131-7/+14
| | | | | | * txr.1: Add missing requirement: warm-up is also not performed if make-random-state is a vector. Improve the wording overall.
* rand: support buffers as random seeds.Kaz Kylheku2021-07-131-5/+5
| | | | | | | | | * rand.c (make_random_state): Recognize buffer object as sources of bits for seeding. * tests/013/rand.tl: New file. * txr.1: Documented.
* New functions: getrlimit, setrlimit.Kaz Kylheku2021-07-131-0/+92
| | | | | | | | | | | | | | | | * stdlib/doc-syms.tl: Updated. * sysif.c (rlim_s, cur_s, max_s): New symbol variables. (rlim_st): New variable. (getrlimit_wrap, setrlimit_wrap): New functions. (sysif_init): gc-protect rlim-st. Initialize symbol vsariables. Create rlim struct type. Register getrlimit and setrlimit intrinsics. Register variables rlim-saved-max, rlim-saved-cur, rlim-infinity, rlimit-core, rlimit-cpu, rlimit-data, rlimit-fsize, rlimit-nofile, rlimit-stack and rlimit-as. * txr.1: Documented under new Unix Resource Limits section.
* Version 266.txr-266Kaz Kylheku2021-07-041-3/+3
| | | | | | | | | | | | | | * RELNOTES: Updated. * configure (txr_ver): Bumped version. * stdlib/ver.tl (lib-version): Bumped. * txr.1: Bumped version and date. * txr.vim, tl.vim: Regenerated. * protsym.c: Likewise.
* doc: interchange first two args of json put funs.Paul A. Patience2021-07-111-6/+6
| | | | | | txr.1: Interchange the first and second arguments of file-put-json, file-put-jsons, file-append-json, file-append-jsons, command-put-json and command-put-jsons.
* New: build-id feature.Kaz Kylheku2021-07-111-0/+6
| | | | | | | | | | | | | | | | | | | | | | A build-id is a string optionally embedded into TXR at build time which can be displayed with a command line option. It can help developers who are juggling multiple builds in their workspace to identify what they are running. * Makefile (txr.o, txr-win.o): If a build_id has been defined, then define the TXR_BUILD_ID macro on the command line when compiling these object files. * configure (build_id): New variable. (help) Describe build_id. (gen_config_make): Generate build_id and build_id_exp make variables. * txr.1: Documented --build-id option. * tsr.c (build_id): Conditionally defined global variable. (help): Brief help string for --build-id. (txr_main): Process --build-id option.
* doc: fix in --version option.Kaz Kylheku2021-07-111-1/+2
| | | | | * txr.1: Revise description of --version command line option for grammar and accuracy.
* doc: finish incomplete sentence about hlet.Kaz Kylheku2021-07-101-1/+7
| | | | | | * txr.1: In a paragraph about the differences between compiled and interpretd behavior, complete a sentence about hlet/hlet* variables. Spotted by Paul A. Patience.
* doc: improve.Paul A. Patience2021-07-101-77/+89
| | | | | | | | | | | | * RELNOTES: Fix minor issues. * txr.1: Fix various grammatical errors, typos and other issues. Notably, use en dashes rather than hyphens for ranges of numbers; replace "exponential notation" with "E notation", which is more commonly used (according to Wikipedia; see https://en.wikipedia.org/wiki/Scientific_notation#E_notation); clarify that with-stream is better than with-resources for opening exactly one stream; and use past tense in the Compatibility Version Values section.
* doc-lookup: ignore BROWSER when empty.Paul A. Patience2021-07-101-3/+4
| | | | | | | | | * stdlib/doc-lookup.tl (open-url): Treat empty BROWSER variable as if it were unset (i.e., ignore it). Otherwise the doc function silently fails rather than falling back to alternative URL-opening methods. * txr.1: Documented.
* New function: add-suffix.Kaz Kylheku2021-07-101-0/+80
| | | | | | | | | | | * stream.c, stream.h (add_suffix): New function. (stream_init): add-suffix intrinsic registered. * tests/018/path.tl: Tests. * txr.1: Documented. * stdlib/doc-syms.tl: Updated.
* New functions: trim-short-suffix, trim-long-suffix.Kaz Kylheku2021-07-101-0/+59
| | | | | | | | | | | | | | | * lib.c, lib.h (chk_substrdup): New function. * stream.c, stream.h (trim_short_suffix, trim_long_suffix): New functions. (stream_init): trim-short-suffix and trim-long-suffix intrinsics registered. * tests/018/path.tl: New tests. * txr.1: Documented. * stdlib/doc-syms.tl: Updated.
* lib: new function separate.Paul A. Patience2021-07-091-1/+41
| | | | | | | | | | | | * lib.c (separate): New function. * lib.h (separate): Declared. * eval.c (eval_init): Register separate intrinsic. * txr.1: Documented. * stdlib/doc-syms.tl: Updated.
* defstruct: diagnose built-in type being redefined.Kaz Kylheku2021-07-091-0/+15
| | | | | | | | | | | | | | | | | | * eval.c (eval_init): Register built-in-type-p intrinsic. * lib.c (buitin_type_p): Rename to built_in_type_p since the word built-in is hyphenated. The function also tests whether the argument is a COBJ class. (cobj_class_exists): Function removed. * stdlib/doc-syms.tl: Updated. * stdlib/struct.tl (defstruct): Add built-in-type-p check. * struct.c (make_struct_type): Call only built_in_type_p; cobj_class_exists is gone. * txr.1: Document built-in-type-p.
* struct: rework stype_handle change.Kaz Kylheku2021-07-091-17/+20
| | | | | | | | | | | | | | | | | | | | | | | The change which allows stype_handle to recognize struct instances, and obtain their type, has some possibly unwanted ramifications, since the function is widely used. Let's refactor things so that, for now, only the struct_type_name function takes advantage of this flexibility. * struct.c (stype_handle_impl): New static function, copy of stype_handle, but taking an obj_ok Boolean argument to indicate whether an object instance is an acceptable argument, whose type should be fetched. (stype_handle): Now a wrapper around stype_handle_impl passing nil for the obj_ok argument. (stype_handle_obj): New static function. Passes t for the ok_obj argument of stype_handle_impl. (struct_type_name): Call stype_handle_obj instead of stype_handle. (super): Take advantage of stype_handle_obj to reduce code. * txr.1: Update documentation of struct-type-name, and improve that of super.
* with-resources: undocumented nil skip behavior.Kaz Kylheku2021-07-071-2/+29
| | | | | | | | | | | | | | | Paul A. Patience discovered the hidden "feature" of with-resourcers, that the three-argument form of the binding (var init cleanup) causes the with-resources form to terminate if init returns nil. The (var init) syntax doesn't generate this logic. * stdlib/with-resources.tl (with-resources): Do not emit the when form unless <= 265 compatibility is in effect. * tests/012/oop-mac.tl: New file. * txr.1: Compat note added.
* doc: base-name: nil suffix defaulting, improvement.Kaz Kylheku2021-07-061-5/+52
| | | | | | * txr.1: Document that the suffix argument to base-name may be given as nil, which is the same as omitting it. Nearby wording improved. Give rationale for this, and add examples.
* Version 265.txr-265Kaz Kylheku2021-07-041-3/+3
| | | | | | | | | | | | | | * RELNOTES: Updated. * configure (txr_ver): Bumped version. * stdlib/ver.tl (lib-version): Bumped. * txr.1: Bumped version and date. * txr.vim, tl.vim: Regenerated. * protsym.c: Likewise.
* listener: treat unset and empty EDITOR the same.Paul A. Patience2021-07-041-1/+1
| | | | | | | * linenoise/linenoise.c (edit_in_editor): Treat empty EDITOR variable as if it were unset (i.e., do nothing). * txr.1: Documented.
* doc: check for spurious spaces.Paul A. Patience2021-07-041-4/+4
| | | | | | | | | | | * checkman.txr (check-spaces): New pattern function for checking for spurious spaces (i.e., two spaces or more in a row) in .meIP, .meti and .mets macros. * txr.1: Fix two instances of spurious spaces ("@\ newline" and "@\ space" examples). Conform the "@\x hex-digits" and "@\ octal-digits" examples to the fixed ones; this is more intuitive since there must be no space before the digits in the escape sequence.
* stack-limit: impose minimum limit.Kaz Kylheku2021-07-041-5/+9
| | | | | | | | | | | | | * gc.c (MIN_STACK_LIMIT): New preprocessor symbol. (gc_init): If the system stack limit is too low, don't treat that the same way as a missing or unlimited limit. Instead clamp to the minimum value and hope for the best. So that is to say, the system limit cannot be used as a mechanism to set a ridiculously low stack limit in TXR; the only way to do that is to use the set-stack-limit function. * txr.1: Documentation updated. Also fixed 326767 typo which should be 32767.
* suffix functions: ignore trailing slashes.Kaz Kylheku2021-07-031-4/+7
| | | | | | | | | | | | | | | | Another requirements tweak to short-suffix and long-suffix: ignore one or more trailing slashes, instead of just one. This harmonizes with base-name, which does same, that requirement being copies from the POSIX basename utility. * stream.c (short_suffix, long_suffix): If sl points to a trailing slash which is the start of a suffix that consists of nothing but trailing slashes, then we pretend it isn't there. * tests/018/path.tl: Adjusted two existing test cases, and added more. * txr.1: Documented.
* doc: find-true spelling error.Kaz Kylheku2021-07-031-1/+1
| | | | | * txr.1: Fix "funtion" in description of new find-true function.
* doc: fix description and example of suffix funsPaul A. Patience2021-07-031-2/+2
| | | | | | | * txr.1: The suffix of path "abc." is ".". Fix the description for this case (which suggested the suffix was the empty string, which was the case before commit bf2e5199e8dbc4e6fd4fcac5dab1ea16f4ec5970) and one of the examples.
* doc: fix various issues.Paul A. Patience2021-07-031-592/+685
| | | | | | | | | | | | | | | | | | | * RELNOTES: Fix typos. * txr.1: Correct alist-remove and alist-nremove's argument lists (the keys are variadic). Remove "(the empty string)" from abs-path-p examples because it formats bizarrely in man output and is anyway mentioned in the description. Remove spurious spaces from .mets lines interfering with the formatting. Add some missing .code and .meta directives. Unitalicize words of Latin origin that have entered the dictionary ("de facto" and "vice versa"). Add hyphens to compound words used as adjectives. Remove hyphen from "non-matching". Move periods inside parentheses containing full sentences. Add missing words. Remove repeated words. Fix various other minor issues. * txr.c (help): Fix a typo. Clarify a description. Add missing periods. Make some other minor changes.
* doc: cptr-put does not exist.Kaz Kylheku2021-07-021-5/+5
| | | | | | | | | | | * txr.1: There is no cptr-put function; it is called cptr-out. The last paragraph refers to cptr-out and it is referenced elsewhere. It has to be cptr-out because it implements the "out semantics" in FFI conversion which pairs with "put"; cptr-put would be a different function, which is not currently implemented. * stdlib/doc-syms.tl: Updated.
* doc: fix various issues in .coNP lines.Paul A. Patience2021-07-011-11/+11
| | | | | | | | | | | * txr.1: Make consistent the style for ellipses in .coNP lines (i.e., without the word "and"). Emend some incorrectly named symbols. Fix various typos and other inconsistencies in .coNP lines. * checkman.txr (check-func): Add exception for caar. Add missing patterns for "Pattern macro", "Operator/function" and "Macro/function". * stdlib/doc-syms.tl: Updated.
* doc: include opt-error in diagram.Kaz Kylheku2021-06-301-0/+2
| | | | * txr.1: Exception hierarchy diagram now includes opt-error.
* path-cat: becomes variadic.Kaz Kylheku2021-06-291-7/+51
| | | | | | | | | | | | | * stream.c (path_vcat): New static function. (stream_init): Register path-cat instrinsic to path_vcat rather than path_cat. * tests/018/path.tl: path-cat tests: all examples from documentation, plus others. * txr.1: Documented existing behaviors that were not clear, like when inputs are empty. Documented new variadic semantics. Examples added.
* doc: mistake in several path-cat examples.Kaz Kylheku2021-06-291-3/+3
| | | | | * txr.1: Corrections to three examples, where one operand is empty, and thus the other is returned.
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