patch 9.0.1958: cannot complete option values Commit: https://github.com/vim/vim/commit/900894b09a95398dfc75599e9f0aa2ea25723384 Author: Yee Cheng Chin <ychin.git@gmail.com> Date: Fri Sep 29 20:42:32 2023 +0200 patch 9.0.1958: cannot complete option values Problem: cannot complete option values Solution: Add completion functions for several options Add cmdline tab-completion for setting string options Add tab-completion for setting string options on the cmdline using `:set=` (along with `:set+=` and `:set-=`). The existing tab completion for setting options currently only works when nothing is typed yet, and it only fills in with the existing value, e.g. when the user does `:set diffopt=<Tab>` it will be completed to `set diffopt=internal,filler,closeoff` and nothing else. This isn't too useful as a user usually wants auto-complete to suggest all the possible values, such as 'iblank', or 'algorithm:patience'. For set= and set+=, this adds a new optional callback function for each option that can be invoked when doing completion. This allows for each option to have control over how completion works. For example, in 'diffopt', it will suggest the default enumeration, but if `algorithm:` is selected, it will further suggest different algorithm types like 'meyers' and 'patience'. When using set=, the existing option value will be filled in as the first choice to preserve the existing behavior. When using set+= this won't happen as it doesn't make sense. For flag list options (e.g. 'mouse' and 'guioptions'), completion will take into account existing typed values (and in the case of set+=, the existing option value) to make sure it doesn't suggest duplicates. For set-=, there is a new `ExpandSettingSubtract` function which will handle flag list and comma-separated options smartly, by only suggesting values that currently exist in the option. Note that Vim has some existing code that adds special handling for 'filetype', 'syntax', and misc dir options like 'backupdir'. This change preserves them as they already work, instead of converting to the new callback API for each option. closes: #13182 Signed-off-by: Christian Brabandt <cb@256bit.org> Co-authored-by: Yee Cheng Chin <ychin.git@gmail.com>

/* cmdexpand.c */
int cmdline_fuzzy_complete(char_u *fuzzystr);
int nextwild(expand_T *xp, int type, int options, int escape);
void cmdline_pum_display(void);
int cmdline_pum_active(void);
void cmdline_pum_remove(void);
void cmdline_pum_cleanup(cmdline_info_T *cclp);
int cmdline_compl_startcol(void);
char_u *ExpandOne(expand_T *xp, char_u *str, char_u *orig, int options, int mode);
void ExpandInit(expand_T *xp);
void ExpandCleanup(expand_T *xp);
int ExpandGeneric(char_u *pat, expand_T *xp, regmatch_T *regmatch, char_u ***matches, int *numMatches, char_u *((*func)(expand_T *, int)), int escaped);
int showmatches(expand_T *xp, int wildmenu);
char_u *addstar(char_u *fname, int len, int context);
void set_expand_context(expand_T *xp);
void set_cmd_context(expand_T *xp, char_u *str, int len, int col, int use_ccline);
int expand_cmdline(expand_T *xp, char_u *str, int col, int *matchcount, char_u ***matches);
void globpath(char_u *path, char_u *file, garray_T *ga, int expand_options, int dirs);
int wildmenu_translate_key(cmdline_info_T *cclp, int key, expand_T *xp, int did_wild_list);
int wildmenu_process_key(cmdline_info_T *cclp, int key, expand_T *xp);
void wildmenu_cleanup(cmdline_info_T *cclp);
void f_getcompletion(typval_T *argvars, typval_T *rettv);
/* vim: set ft=c : */