lua: reimplement word and file name completion in lua

The file name completion does not yet behave the same way as
the previous C code because the completion prefix is currently
simply calculated using the `iw` text object which does not
handle common path elements (e.g. `.`, `/`, `~`, etc).

3 files changed, 47 insertions, 0 deletions

diff --git a/lua/plugins/complete-filename.lua b/lua/plugins/complete-filename.lua
new file mode 100644
index 0000000..824e33a
--- /dev/null
+++ b/lua/plugins/complete-filename.lua
@@ -0,0 +1,23 @@
+-- complete file name at primary cursor location using vis-complete(1)
+
+vis:map(vis.modes.INSERT, "<C-x><C-f>", function()
+	local win = vis.win
+	local file = win.file
+	local pos = win.cursor.pos
+	if not pos then return end
+	-- TODO do something clever here
+	local range = file:text_object_word(pos > 0 and pos-1 or pos);
+	if not range then return end
+	if range.finish > pos then range.finish = pos end
+	if range.start == range.finish then return end
+	local prefix = file:content(range)
+	if not prefix then return end
+	local cmd = string.format("vis-complete --file '%s'", prefix:gsub("'", "'\\''"))
+	local status, out, err = vis:pipe(file, { start = 0, finish = 0 }, cmd)
+	if status ~= 0 or not out then
+		if err then vis:info(err) end
+		return
+	end
+	file:insert(pos, out)
+	win.cursor.pos = pos + #out
+end, "Complete file name")
diff --git a/lua/plugins/complete-word.lua b/lua/plugins/complete-word.lua
new file mode 100644
index 0000000..68ce385
--- /dev/null
+++ b/lua/plugins/complete-word.lua
@@ -0,0 +1,22 @@
+-- complete word at primary cursor location using vis-complete(1)
+
+vis:map(vis.modes.INSERT, "<C-n>", function()
+	local win = vis.win
+	local file = win.file
+	local pos = win.cursor.pos
+	if not pos then return end
+	local range = file:text_object_word(pos > 0 and pos-1 or pos);
+	if not range then return end
+	if range.finish > pos then range.finish = pos end
+	if range.start == range.finish then return end
+	local prefix = file:content(range)
+	if not prefix then return end
+	local cmd = string.format("vis-complete --word '%s'", prefix:gsub("'", "'\\''"))
+	local status, out, err = vis:pipe(file, { start = 0, finish = file.size }, cmd)
+	if status ~= 0 or not out then
+		if err then vis:info(err) end
+		return
+	end
+	file:insert(pos, out)
+	win.cursor.pos = pos + #out
+end, "Complete word in file")
diff --git a/lua/vis-std.lua b/lua/vis-std.lua
index 6499f24..a0b84f6 100644
--- a/lua/vis-std.lua
+++ b/lua/vis-std.lua
@@ -131,3 +131,5 @@ require('plugins/filetype')
 require('plugins/textobject-lexer')
 require('plugins/digraph')
 require('plugins/number-inc-dec')
+require('plugins/complete-word')
+require('plugins/complete-filename')