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fix(diff): use mmfile_t in linematch

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Problem:

Linematch used to use strchr to navigate a string, however strchr does
not supoprt embedded NULs.

Solution:

Use `mmfile_t` instead of `char *` in linematch and introduce `strnchr()`.

Also remove heap allocations from `matching_char_iwhite()`

Fixes: #30505
(cherry picked from commit c65646c247)
This commit is contained in:
Lewis Russell
2024-09-26 16:10:11 +01:00
parent 045afa9e8a
commit f31e29fce4
9 changed files with 108 additions and 79 deletions
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26
runtime/lua/vim/_meta/diff.lua
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@@ -11,19 +11,19 @@
--- - `count_a` (`integer`): Hunk size in {a}.
--- - `start_b` (`integer`): Start line of hunk in {b}.
--- - `count_b` (`integer`): Hunk size in {b}.
--- @field on_hunk fun(start_a: integer, count_a: integer, start_b: integer, count_b: integer): integer
--- @field on_hunk? fun(start_a: integer, count_a: integer, start_b: integer, count_b: integer): integer
---
--- Form of the returned diff:
--- - `unified`: String in unified format.
--- - `indices`: Array of hunk locations.
--- Note: This option is ignored if `on_hunk` is used.
--- (default: `'unified'`)
--- @field result_type 'unified'|'indices'
--- @field result_type? 'unified'|'indices'
---
--- Run linematch on the resulting hunks from xdiff. When integer, only hunks
--- upto this size in lines are run through linematch.
--- Requires `result_type = indices`, ignored otherwise.
--- @field linematch boolean|integer
--- @field linematch? boolean|integer
---
--- Diff algorithm to use. Values:
--- - `myers`: the default algorithm
@@ -31,15 +31,15 @@
--- - `patience`: patience diff algorithm
--- - `histogram`: histogram diff algorithm
--- (default: `'myers'`)
--- @field algorithm 'myers'|'minimal'|'patience'|'histogram'
--- @field ctxlen integer Context length
--- @field interhunkctxlen integer Inter hunk context length
--- @field ignore_whitespace boolean Ignore whitespace
--- @field ignore_whitespace_change boolean Ignore whitespace change
--- @field ignore_whitespace_change_at_eol boolean Ignore whitespace change at end-of-line.
--- @field ignore_cr_at_eol boolean Ignore carriage return at end-of-line
--- @field ignore_blank_lines boolean Ignore blank lines
--- @field indent_heuristic boolean Use the indent heuristic for the internal diff library.
--- @field algorithm? 'myers'|'minimal'|'patience'|'histogram'
--- @field ctxlen? integer Context length
--- @field interhunkctxlen? integer Inter hunk context length
--- @field ignore_whitespace? boolean Ignore whitespace
--- @field ignore_whitespace_change? boolean Ignore whitespace change
--- @field ignore_whitespace_change_at_eol? boolean Ignore whitespace change at end-of-line.
--- @field ignore_cr_at_eol? boolean Ignore carriage return at end-of-line
--- @field ignore_blank_lines? boolean Ignore blank lines
--- @field indent_heuristic? boolean Use the indent heuristic for the internal diff library.
-- luacheck: no unused args
@@ -65,7 +65,7 @@
---
---@param a string First string to compare
---@param b string Second string to compare
---@param opts vim.diff.Opts
---@param opts? vim.diff.Opts
---@return string|integer[][]?
--- See {opts.result_type}. `nil` if {opts.on_hunk} is given.
function vim.diff(a, b, opts) end