api: set_text: fix some byte count issues

add byte count tests

update documentation

1 files changed, 66 insertions, 1 deletions

diff --git a/test/functional/lua/buffer_updates_spec.lua b/test/functional/lua/buffer_updates_spec.lua
index 9f2b1b6e52..67dc5f5a16 100644
--- a/test/functional/lua/buffer_updates_spec.lua
+++ b/test/functional/lua/buffer_updates_spec.lua
@@ -288,7 +288,8 @@ describe('lua: nvim_buf_attach on_bytes', function()
     -- TODO: while we are brewing the real strong coffe,
     -- verify should check buf_get_offset after every check_events
     if verify then
-      meths.buf_get_offset(0, meths.buf_line_count(0))
+      local len = meths.buf_get_offset(0, meths.buf_line_count(0))
+      eq(len == -1 and 1 or len, string.len(shadowbytes))
     end
     exec_lua("return test_register(...)", 0, "test1", false, false, true)
     meths.buf_get_changedtick(0)
@@ -510,6 +511,70 @@ describe('lua: nvim_buf_attach on_bytes', function()
         { "test1", "bytes", 1, 3, 0, 1, 1, 0, 3, 3, 0, 1, 1 };
       }
     end)
+
+    it('nvim_buf_set_text insert', function()
+      local check_events = setup_eventcheck(verify, {"bastext"})
+      meths.buf_set_text(0, 0, 3, 0, 3, {"fiol","kontra"})
+      check_events {
+        { "test1", "bytes", 1, 3, 0, 3, 3, 0, 0, 0, 1, 6, 11 };
+      }
+
+      meths.buf_set_text(0, 1, 6, 1, 6, {"punkt","syntgitarr","övnings"})
+      check_events {
+        { "test1", "bytes", 1, 4, 1, 6, 14, 0, 0, 0, 2, 8, 25 };
+      }
+
+      eq({ "basfiol", "kontrapunkt", "syntgitarr", "övningstext" },
+         meths.buf_get_lines(0, 0, -1, true))
+    end)
+
+    it('nvim_buf_set_text replace', function()
+      local check_events = setup_eventcheck(verify, origlines)
+
+      meths.buf_set_text(0, 2, 3, 2, 8, {"very text"})
+      check_events {
+        { "test1", "bytes", 1, 3, 2, 3, 35, 0, 5, 5, 0, 9, 9 };
+      }
+
+      meths.buf_set_text(0, 3, 5, 3, 7, {" splitty","line "})
+      check_events {
+        { "test1", "bytes", 1, 4, 3, 5, 57, 0, 2, 2, 1, 5, 14 };
+      }
+
+      meths.buf_set_text(0, 0, 8, 1, 2, {"JOINY"})
+      check_events {
+        { "test1", "bytes", 1, 5, 0, 8, 8, 1, 2, 10, 0, 5, 5 };
+      }
+
+      meths.buf_set_text(0, 4, 0, 6, 0, {"was 5,6",""})
+      check_events {
+        { "test1", "bytes", 1, 6, 4, 0, 75, 2, 0, 32, 1, 0, 8 };
+      }
+
+      eq({ "originalJOINYiginal line 2", "orivery text line 3", "origi splitty",
+           "line l line 4", "was 5,6", "    indented line" },
+         meths.buf_get_lines(0, 0, -1, true))
+
+    end)
+
+    it('nvim_buf_set_text delete', function()
+      local check_events = setup_eventcheck(verify, origlines)
+
+      -- really {""} but accepts {} as a shorthand
+      meths.buf_set_text(0, 0, 0, 1, 0, {})
+      check_events {
+        { "test1", "bytes", 1, 3, 0, 0, 0, 1, 0, 16, 0, 0, 0 };
+      }
+
+      -- TODO(bfredl): this works but is not as convenient as set_lines
+      meths.buf_set_text(0, 4, 15, 5, 17, {""})
+      check_events {
+        { "test1", "bytes", 1, 4, 4, 15, 79, 1, 17, 18, 0, 0, 0 };
+      }
+      eq({ "original line 2", "original line 3", "original line 4",
+           "original line 5", "original line 6" },
+         meths.buf_get_lines(0, 0, -1, true))
+    end)
   end
 
   describe('(with verify) handles', function()