generated from eblume/project-template
66 lines
2.5 KiB
Lua
66 lines
2.5 KiB
Lua
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--- Conceal `[[NODEID|Name]]` links down to a styled "Name" hyperlink in node
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--- buffers (tech-spec §8.4). The node id is structural noise to a reader, so we
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--- hide the `[[id|` prefix and the `]]` suffix with conceal extmarks, leaving
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--- the label visible and highlighted. `conceallevel=2` + an empty
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--- `concealcursor` reveal the raw `[[id|Name]]` on the line the cursor is on, so
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--- it stays directly editable. A bare `[[id]]` (briefly, before save→reload
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--- canonicalises it) just hides its brackets.
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local M = {}
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local ns = vim.api.nvim_create_namespace("heph_link_conceal")
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--- Recompute conceal extmarks for every `[[…]]` span in `buf`.
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function M.refresh(buf)
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if not vim.api.nvim_buf_is_valid(buf) then
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return
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end
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vim.api.nvim_buf_clear_namespace(buf, ns, 0, -1)
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local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)
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for lnum, line in ipairs(lines) do
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local row = lnum - 1
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local from = 1
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while true do
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local s = line:find("[[", from, true) -- 1-based byte of first `[`
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if not s then
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break
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end
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local e = line:find("]]", s + 2, true) -- 1-based byte of `]]`
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if not e then
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break
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end
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local inner = line:sub(s + 2, e - 1)
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local pipe = inner:find("|", 1, true)
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-- Byte columns are 0-based for extmarks; end_col is exclusive.
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local open_end -- exclusive end of the hidden prefix (`[[` or `[[id|`)
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if pipe then
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open_end = (s + 1 + pipe) -- 0-based col just past the `|`
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else
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open_end = s + 1 -- 0-based col just past `[[`
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end
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-- Hide the prefix, highlight the visible label, hide the closing `]]`.
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vim.api.nvim_buf_set_extmark(buf, ns, row, s - 1, { end_col = open_end, conceal = "" })
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vim.api.nvim_buf_set_extmark(buf, ns, row, open_end, { end_col = e - 1, hl_group = "HephLink" })
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vim.api.nvim_buf_set_extmark(buf, ns, row, e - 1, { end_col = e + 1, conceal = "" })
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from = e + 2
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end
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end
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end
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--- Enable link conceal for the current window + `buf`: define the highlight,
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--- set the window conceal options, refresh now, and refresh on edits.
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function M.attach(buf)
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vim.api.nvim_set_hl(0, "HephLink", { link = "Underlined", default = true })
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vim.wo.conceallevel = 2
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vim.wo.concealcursor = "" -- reveal the raw link on the cursor's line
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M.refresh(buf)
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vim.api.nvim_create_autocmd({ "TextChanged", "TextChangedI" }, {
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buffer = buf,
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callback = function()
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M.refresh(buf)
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end,
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desc = "heph: refresh [[link]] conceal",
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})
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end
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return M
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