diff options
Diffstat (limited to 'util.lua')
| -rw-r--r-- | util.lua | 46 |
1 files changed, 46 insertions, 0 deletions
@@ -206,4 +206,50 @@ function util.find_upwards(globs, start) return out:sub(1, #out - 1) end +-- get the vis_selection from current primary selection +local function get_selection(win) + return {line = win.selection.line, col = win.selection.col} +end + +--- Get the 0-based byte offset from a selection. +-- @param sel the vis_selection to convert to a position +-- @return the 0-based position of the selection +function util.vis_sel_to_pos(file, sel) + if file.pos_by_linecol then + return file:pos_by_linecol(sel.line, sel.col) + end + + local line_count = 0 + local pos = 0 + for line in file:lines_iterator() do + line_count = line_count + 1 + if line_count == sel.line then + return pos + (sel.col - 1) + end + pos = pos + #line + 1 + end + return 0 +end + +--- Get the line and column from a 0-based byte offset +-- ATTENTION: the fallback version of this function modifies the primary +-- selection so it is not safe to call it for example during WIN_HIGHLIGHT events +-- @param pos the 0-based byte offset into the file +-- @return the 1-based line number +-- @return the 1-based column +function util.vis_pos_to_sel(win, pos) + if win.file.linecol_by_pos then + local lineno, col = win.file:linecol_by_pos(pos) + return {line = lineno, col = col} + end + + local old_selection = get_selection(win) + -- move primary selection + win.selection.pos = pos + local sel = get_selection(win) + -- restore old primary selection + win.selection:to(old_selection.line, old_selection.col) + return sel +end + return util |