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feat(api): implement nvim_buf_get_text (#15181)

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nvim_buf_get_text is the mirror of nvim_buf_set_text. It differs from
nvim_buf_get_lines in that it allows retrieving only portions of lines.

While this can typically be done easily enough by API clients,
implementing this function provides symmetry between the get/set
text/lines APIs, and also provides a nice convenience that saves API
clients the work of having to slice the result of nvim_buf_get_lines
themselves.
This commit is contained in:
Gregory Anders
2022-02-22 13:19:21 -07:00
committed by GitHub
parent 30c9c8815b
commit 11f7aeed7a
4 changed files with 207 additions and 10 deletions
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28
test/functional/api/buffer_spec.lua
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@@ -537,6 +537,34 @@ describe('api/buf', function()
end)
end)
describe('nvim_buf_get_text', function()
local get_text = curbufmeths.get_text
it('works', function()
insert([[
hello foo!
text]])
eq({'hello'}, get_text(0, 0, 0, 5, {}))
eq({'hello foo!'}, get_text(0, 0, 0, 42, {}))
eq({'foo!'}, get_text(0, 6, 0, 10, {}))
eq({'foo!', 'tex'}, get_text(0, 6, 1, 3, {}))
eq({'foo!', 'tex'}, get_text(-2, 6, -1, 3, {}))
eq({''}, get_text(0, 18, 0, 20, {}))
eq({'ext'}, get_text(-1, 1, -1, 4, {}))
end)
it('errors on out-of-range', function()
eq(false, pcall(get_text, 2, 0, 3, 0, {}))
eq(false, pcall(get_text, 0, 0, 4, 0, {}))
end)
it('errors when start is greater than end', function()
eq(false, pcall(get_text, 1, 0, 0, 0, {}))
eq(false, pcall(get_text, 0, 1, 0, 0, {}))
end)
end)
describe('nvim_buf_get_offset', function()
local get_offset = curbufmeths.get_offset
it('works', function()