V 0.4.6

20 May 2024

Improvements in the language

• Experimental x.vweb is now veb , the official and recommended way to build web apps in V. Built on top of pico.v.
• autofree: -print_autofree_vars command line flag for printing variables autofree couldn't free
• Add @VMODHASH comptime variable to store the commit sha of a V module ( #21091 )
• Fix sumtype support for option variant types ( #21101 )
• Utilize new diff functions in errors (expected/found) ( #21431 )
• Add @[_linker_section] for global variables

Breaking changes

• checker: disallow initializing private struct fields outside structs module ( #21183 )
• vlib: update handling of imports whose symbols are not directly used in imported file, remove pub const is_used = 1 workarounds ( #21160 )
• net.ftp: allow to choose a different port than port 21 (change FTP.connect to accept host:port , not just a host address) ( #21185 )

Checker improvements/fixes

• Ambiguous expression notice for & << >> , similar to && ||
• Disallow using aliases of ?Type as !Type ( #21128 )
• Fix option checker arg validation for ptr passing on non expected ptr ( #21087 )
• Optimize option and result type check, add more typinfo to error details ( #21105 )
• Move error handling for any type to the checker to resolve parsing issues ( #21146 )
• Move error handling for user defined type duplicates to the checker to resolve parsing issues ( #21147 )
• Detect redundant ref when assigning call expr with ref return ( #21141 )
• Fix multi return using nil and voidptrfix (fix #17343 ) ( #21144 )
• Fix C struct embedded init fields checking ( #21137 )
• Remove resolved vfmt workaround and TODO ( #21175 )
• Move more match validation from the parser into the checker, add error for match without branches ( #21181 )
• Improve the error message for an unknown type ( #21207 )
• Allow passing none to fn f(arg ?&Type) { (fix #21213 ) ( #21231 )
• Fix -parallel-cc regression (part 1, workaround .filter(fn[c]) used in checker/orm.v) ( #21238 )
• Detect and error on unreachable code in loops, after continue and break statements ( #21294 )
• Disallow Result callbacks functions like map/filter/all/any ( #21055 )
• Fix missing check for or expr on string interpolation ( #17566 )
• Allow pass array as mut param to spawn fn ( #21283 )
• Turn array assign warning into error ( #21341 )
• Ignore last semicolon on or-expr ( #21361 )
• Disallow structs with @[params] attribute as mutable function parameters ( #21206 )
• Set auto Return pos correctly; cgen: autofree fix for optional returns
• Disallow invalid ptr operations ( #21515 )
• Fix wrong checking for heap struct ( #21511 )
• Allow alias enum flagged to have bit operations ( #21532 )
• Simplify, utilize pref.vroot ( #21096 )
• Fix option interface member checking when none is passed ( #21509 )

Parser improvements

• Fix option as possible match case for sumtype ( #21079 )
• orm: disallow invalid infix for where clause in delete and update ( #21113 )
• Fix case of falsely registering imports as used, remove unused imports ( #21156 )
• Remove redundant comments_mode field ( #21198 )
• Update file path fields; use more expressive name for file path, remove obsolete file_name_dir field ( #21202 )
• Add missing docstrings for vlib/v/ast/comptime_const_values.v functions ( #21219 )
• Allow struct init on for in Iterator{} { (fix #21179 ) ( #21282 )
• Fix for x in Iterator{} { , when there are no field initialisations ( #21333 )
• Add check for result type on chan init ( #21363 )
• Fix comptime panic for $tmpl("x.html") , when the template file contained % at the end ( #21402 )
• Parse string and array typ idx of ScopeVar and Ident ( #21523 )

Compiler internals

• v.util: use tmp instead of cache dir for temporary diff files ( #21075 )
• v.util: fix module lookup if module import parts end with the word modules ( #21083 )
• v.util: update githash to be able to get the githash of every passed project ( #21178 )
• v.util: improve detection for opendiff when automatically searching difftools ( #21241 )
• v.util: improve color_compare_files ( #21247 )
• v.util: improve find_diff_cmd: don't add spaces to result without env opts ( #21242 )
• v.util: fix diff coloring, add test ( #21260 )
• v.util: polish off diff utils after recent updates and fixes, add doc comments to pub fns ( #21275 )
• v.builder: suggest using v wipe-cache , when the object files are not recognized
• pref: be more conservative when generating code using -cross , allow for $if cross ? {
• builder: use cc enum in CcompilerOptions, fix cc detection, enable cc guessing without prod flag ( #21370 )
• pref: fix version flag handling ( #21377 )
• pref: make minor performance related changes / simplify ( #21379 )
• builder: simplify generic cc detection ( #21380 )
• pref: extract architecture related code into arch.c.v ; rename pref.c.v to pref.v ( #21387 )
• pref: update os_from_string , add missing qnx , remove deprecated wasm options that used - instead of _ ( #21390 )
• v.util: rewrite diff module, deprecate old functions ( #21403 )
• v.util: fix color when auto tool is diff ( #21435 )
• v.util: make diff_test.v more robust to the color settings for the chosen local diff tool
• v.util: fix performance with v test-cleancode , when a slower diff tool is installed ( #21447 )
• v.util: remove fast path in diff.compare_text ( #21458 )
• v.pref: error for v file.v --unknown-option ( #21391 )

Standard library

• builtin,dlmalloc: fixes for v vlib/v/gen/c/coutput_test.v for gcc14.1, which is stricter
• Min window width and height
• builtin: str.last_index(); pref: hide-auto-str;
• toml: update the alexcrichton and BurntSushi repos to their successors toml-rs, and toml-test, record new exceptions ( #21152 )
• json: allow i32 decoding and encoding ( #21162 )
• json2: add ability to decode arrays ( #21163 )
• json2,checker,toml: allow field.typ compile-time checking with MatchExpr and add array of option checking ( #21171 )
• gg: draw_text with custom fonts
• x.json2: add a way to decode an array ( #21186 )
• os: clarify some doc comments ( #21209 )
• os: fix double free in os.get_raw_line() (used by os.input), with -autofree ( #21204 )
• time: extract Duration related code into duration.v ( #21229 )
• builtin: implement an at_exit(cb) wrapper for C.atexit (part 1) ( #21254 )
• os: format readme, fix markdown inside html ( #21286 )
• time: update unix time acces, fix issues related to deviating unix times ( #21293 )
• vlib: refactor empty string checks to use s == '' or s != '' , instead of s.len == 0 ( #21300 )
• cli: update command_test.v ( #21307 )
• cli: extend control over defaults ( #21308 )
• thirdparty/sokol: bump _SGL_DEFAULT_MAX_VERTICES and _SGL_DEFAULT_MAX_COMMANDS again; mark them with __v_ start and __v_ end
• sync: add Gentoo paths for libatomic
• sync.stdatomic: add flag lines for gcc 14 too
• gg: make PenConfig fields public ( #21353 )
• builtin: fix undefined read s[0], from ''.is_lower() and ''.is_upper() in c7af2c2
• builtin: fix empty string lower / upper assert ( #21358 )
• cli: simplify flag parsing ( #21392 )
• os,runtime: workaround for v.c generation instability
• datatypes: fix for set - operator, union and intersection, now they no longer change the receiver (fix #21315 ) ( #21362 )
• sync.stdatomic: add paths for compilation with musl on Gentoo ( #21400 )
• os: fix os.execute stderr redirection (fix #20986 ) ( #21404 )
• time: fix the string representation of a negative Duration ( #21407 )
• cli: make program outputs using the cli module testable in cli/testdata ( #21456 )
• math.unsigned: permit _ separators in Uint128 decimal strings passed to uint128_from_dec_str ( #21461 )
• cli: fix default flags when their command equivalents are disabled ( #21469 )
• toml: simplify decode_quoted_escapes ( #21472 )
• os: fix join-path ( #21425 )
• builtin: simplify MessageError.msg() ( #21524 )
• all: replace usages of C.atexit(cb) with at_exit(cb) or {} (part 2) ( #21263 )
• math.unsigned: fix some Uint256 bugs and add tests ( #21528 )

Web

• Update mbedtls to latest compatible version v3.3.0 ( #21118 )
• veb.auth: a minor find_token fix
• Improve descriptions ( #21155 )
• ci: change listen ports in vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v for both vweb and x.vweb, to reduce probability of network errors
• ci: mark both vweb and x.vweb versions of vweb_should_listen_on_both_ipv4_and_ipv6_by_default_test.v as flaky
• x.vweb: accept query params as method arguments ( #21201 )
• net.http.file: support index_file ( index.html by default), and auto_index (true by default) parameters to file.serve()
• veb: copy x.vweb to veb, and make it work with comptime
• ci: fix the ubuntu-docker-musl job by skipping veb_app_test.v
• pref: support a shortcut: v -http for v -e "import net.http.file; file.serve()" .
• net: add a .port()! method for net.Addr ( #21412 )
• net: improve error message in .port()
• picoev: handle EAGAIN or EWOULDBLOCK quietly ( #21480 )
• net.unix: remove debug/trace eprintln ( #21517 )

ORM

• Add error for unchecked option multi return types, fix undefined behavior ( #21106 )

Database drivers

• db.mysql: fix invalid memory access in exec_one for returned rows with NULL fields ( #21317 )

C backend

• Enable autofree for option ( #21051 )
• Force C struct types which does not implement str() to be passed as ptr ( #21054 )
• Improve diagnostic information for ORM queries with invalid types
• Allow static call on generic type ( #21071 )
• Fix code generation for a struct field, having a type of fixed array of options field [5]?Type ( #21082 )
• Add the _M_ARM64 macro to endianness check ( #21109 )
• Fix return code when returning interface result type (fix #21115 ) ( #21130 )
• Fix const initialized with array ( #21131 )
• Fix infix array heap comparison ( #21145 )
• Fix C struct sumtype support ( #21129 )
• Add autofree comptime check ( #21197 )
  ...