feat(marks): add conceal_lines to nvim_buf_set_extmark()

Implement an extmark property that conceals lines vertically.

2 files changed, 223 insertions, 0 deletions

diff --git a/test/functional/api/extmark_spec.lua b/test/functional/api/extmark_spec.lua
index fd392d479d..6f53076f1f 100644
--- a/test/functional/api/extmark_spec.lua
+++ b/test/functional/api/extmark_spec.lua
@@ -1556,6 +1556,7 @@ describe('API/extmarks', function()
   it('can get details', function()
     set_extmark(ns, marks[1], 0, 0, {
       conceal = 'c',
+      conceal_lines = '',
       cursorline_hl_group = 'Statement',
       end_col = 0,
       end_right_gravity = true,
@@ -1585,6 +1586,7 @@ describe('API/extmarks', function()
       0,
       {
         conceal = 'c',
+        conceal_lines = '',
         cursorline_hl_group = 'Statement',
         end_col = 0,
         end_right_gravity = true,
diff --git a/test/functional/ui/decorations_spec.lua b/test/functional/ui/decorations_spec.lua
index 99e6b5f78f..1d0021363b 100644
--- a/test/functional/ui/decorations_spec.lua
+++ b/test/functional/ui/decorations_spec.lua
@@ -2625,6 +2625,227 @@ describe('extmark decorations', function()
                                                         |
     ]])
   end)
+
+  it ('conceal_lines', function()
+    insert(example_text)
+    exec('set number conceallevel=3')
+    feed('ggj')
+    local not_concealed = {
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  2 }^    local text, hl_id_cell, count = unpack(ite|
+        {2:    }m)                                            |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  4 }        hl_id = hl_id_cell                    |
+        {2:  5 }    end                                       |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|
+                                                          |
+      ]]
+    }
+    screen:expect(not_concealed)
+    api.nvim_buf_set_extmark(0, ns, 1, 0, { conceal_lines = "" })
+    screen:expect_unchanged()
+    feed('j')
+    local concealed = {
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }^    if hl_id_cell ~= nil then                 |
+        {2:  4 }        hl_id = hl_id_cell                    |
+        {2:  5 }    end                                       |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*3
+                                                          |
+      ]]
+    }
+    screen:expect(concealed)
+    feed('k')
+    screen:expect(not_concealed)
+    exec('set concealcursor=n')
+    screen:expect(concealed)
+    api.nvim_buf_set_extmark(0, ns, 3, 0, { conceal_lines = "" })
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }^    if hl_id_cell ~= nil then                 |
+        {2:  5 }    end                                       |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*4
+                                                          |
+      ]]
+    })
+    feed('kjj')
+    screen:expect_unchanged()
+    api.nvim_buf_set_extmark(0, ns, 4, 0, { conceal_lines = "" })
+    feed('kjjjC')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  5 }^                                              |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*4
+        {24:-- INSERT --}                                      |
+      ]]
+    })
+    feed('<esc>')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  6 }^    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*5
+                                                          |
+      ]]
+    })
+    feed('kji')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  5 }^                                              |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*4
+        {24:-- INSERT --}                                      |
+      ]]
+    })
+    feed('conceal text')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  5 }conceal text^                                  |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*4
+        {24:-- INSERT --}                                      |
+      ]]
+    })
+    feed('<esc>')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  6 }    for _ =^ 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*5
+                                                          |
+      ]]
+    })
+    feed('ggzfj')
+    screen:expect({
+      grid = [[
+        {2:  1 }{33:^+--  2 lines: for _,item in ipairs(items) do··}|
+        {2:  3 }    if hl_id_cell ~= nil then                 |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*5
+                                                          |
+      ]]
+    })
+    feed('j')
+    screen:expect({
+      grid = [[
+        {2:  1 }{33:+--  2 lines: for _,item in ipairs(items) do··}|
+        {2:  3 }^    if hl_id_cell ~= nil then                 |
+        {2:  6 }    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*5
+                                                          |
+      ]]
+    })
+    feed('ggzdjzfj')
+    screen:expect({
+      grid = [[
+        {2:  1 }for _,item in ipairs(items) do                |
+        {2:  6 }^    for _ = 1, (count or 1) do                |
+        {2:  7 }        local cell = line[colpos]             |
+        {2:  8 }        cell.text = text                      |
+        {2:  9 }        cell.hl_id = hl_id                    |
+        {2: 10 }        colpos = colpos+1                     |
+        {2: 11 }    end                                       |
+        {2: 12 }end                                           |
+        {1:~                                                 }|*6
+                                                          |
+      ]]
+    })
+    feed('jj')
+    screen:expect_unchanged()
+    -- Below virtual line belonging to line above concealed line is drawn.
+    api.nvim_buf_set_extmark(0, ns, 0, 0, { virt_lines = { { { 'line 1 below' } } } })
+    -- Above virtual line belonging to concealed line isn't.
+    api.nvim_buf_set_extmark(0, ns, 1, 0, {
+      virt_lines = { { { 'line 2 above' } } },
+      virt_lines_above = true
+    })
+    screen:expect([[
+      {2:  1 }for _,item in ipairs(items) do                |
+      {2:    }line 1 below                                  |
+      {2:  6 }^    for _ = 1, (count or 1) do                |
+      {2:  9 }        cell.hl_id = hl_id                    |
+      {2: 10 }        colpos = colpos+1                     |
+      {2: 11 }    end                                       |
+      {2: 12 }end                                           |
+      {1:~                                                 }|*7
+                                                        |
+    ]])
+  end)
 end)
 
 describe('decorations: inline virtual text', function()