feat: add b:gitsigns_line_blame

Resolves #573

doc/gitsigns.txt

@@ -975,10 +975,13 @@ a short commit hash. `g:gitsigns_head` returns the current HEAD for the
 current working directory, whereas `b:gitsigns_head` returns the current HEAD
 for each buffer.
 
-                                                  *b:gitsigns_blame_line_dict*
-If |gitsigns-config-current_line_blame| is enabled, then contains dictionary
-of the blame object for current line. For complete list of keys, see the
-{blame_info} argument from |gitsigns-config-current_line_blame_formatter|.
+                            *b:gitsigns_blame_line* *b:gitsigns_blame_line_dict*
+Provided if |gitsigns-config-current_line_blame| is enabled.
+`b:gitsigns_blame_line` if formatted using
+`config.current_line_blame_formatter`. `b:gitsigns_blame_line_dict` is a
+dictionary containing of the blame object for the current line. For complete
+list of keys, see the {blame_info} argument from
+|gitsigns-config-current_line_blame_formatter|.
 
 ==============================================================================
 TEXT OBJECTS                                             *gitsigns-textobject*

etc/doc_template.txt

@@ -132,10 +132,13 @@ a short commit hash. `g:gitsigns_head` returns the current HEAD for the
 current working directory, whereas `b:gitsigns_head` returns the current HEAD
 for each buffer.
 
-                                                  *b:gitsigns_blame_line_dict*
-If |gitsigns-config-current_line_blame| is enabled, then contains dictionary
-of the blame object for current line. For complete list of keys, see the
-{blame_info} argument from |gitsigns-config-current_line_blame_formatter|.
+                            *b:gitsigns_blame_line* *b:gitsigns_blame_line_dict*
+Provided if |gitsigns-config-current_line_blame| is enabled.
+`b:gitsigns_blame_line` if formatted using
+`config.current_line_blame_formatter`. `b:gitsigns_blame_line_dict` is a
+dictionary containing of the blame object for the current line. For complete
+list of keys, see the {blame_info} argument from
+|gitsigns-config-current_line_blame_formatter|.
 
 ==============================================================================
 TEXT OBJECTS                                             *gitsigns-textobject*

lua/gitsigns/current_line_blame.lua

@@ -37,7 +37,7 @@ local function get_extmark(bufnr)
    return
 end
 
-local reset = function(bufnr)
+local function reset(bufnr)
    bufnr = bufnr or current_buf()
    api.nvim_buf_del_extmark(bufnr, namespace, 1)
    vim.b[bufnr].gitsigns_blame_line_dict = nil
@@ -85,6 +85,14 @@ local function expand_blame_format(fmt, name, info)
    return util.expand_format(fmt, info, config.current_line_blame_formatter_opts.relative_time)
 end
 
+local function flatten_virt_text(virt_text)
+   local res = {}
+   for _, part in ipairs(virt_text) do
+      res[#res + 1] = part[1]
+   end
+   return table.concat(res)
+end
+
 
 local update = void(function()
    local bufnr = current_buf()
@@ -147,7 +155,7 @@ local update = void(function()
 
    vim.b[bufnr].gitsigns_blame_line_dict = result
 
-   if opts.virt_text and result then
+   if result then
       local virt_text
       local clb_formatter = result.author == 'Not Committed Yet' and
       config.current_line_blame_formatter_nc or
@@ -165,12 +173,16 @@ local update = void(function()
 
       end
 
-      set_extmark(bufnr, lnum, {
-         virt_text = virt_text,
-         virt_text_pos = opts.virt_text_pos,
-         priority = opts.virt_text_priority,
-         hl_mode = 'combine',
-      })
+      vim.b[bufnr].gitsigns_blame_line = flatten_virt_text(virt_text)
+
+      if opts.virt_text then
+         set_extmark(bufnr, lnum, {
+            virt_text = virt_text,
+            virt_text_pos = opts.virt_text_pos,
+            priority = opts.virt_text_priority,
+            hl_mode = 'combine',
+         })
+      end
    end
 end)
 

teal/gitsigns/current_line_blame.tl

@@ -37,7 +37,7 @@ local function get_extmark(bufnr: integer): integer
   return
 end
 
-local reset = function(bufnr: integer)
+local function reset(bufnr: integer)
   bufnr = bufnr or current_buf()
   api.nvim_buf_del_extmark(bufnr, namespace, 1)
   vim.b[bufnr].gitsigns_blame_line_dict = nil
@@ -85,6 +85,14 @@ local function expand_blame_format(fmt: string, name: string, info: BlameInfo):
   return util.expand_format(fmt, info, config.current_line_blame_formatter_opts.relative_time)
 end
 
+local function flatten_virt_text(virt_text: {{string, string}}): string
+  local res = {}
+  for _, part in ipairs(virt_text) do
+      res[#res+1] = part[1]
+  end
+  return table.concat(res)
+end
+
 -- Update function, must be called in async context
 local update = void(function()
   local bufnr = current_buf()
@@ -147,7 +155,7 @@ local update = void(function()
 
   vim.b[bufnr].gitsigns_blame_line_dict = result
 
-  if opts.virt_text and result then
+  if result then
     local virt_text: {{string, string}}
     local clb_formatter = result.author == 'Not Committed Yet' and
       config.current_line_blame_formatter_nc or
@@ -165,12 +173,16 @@ local update = void(function()
       )
     end
 
-    set_extmark(bufnr, lnum, {
-      virt_text     = virt_text,
-      virt_text_pos = opts.virt_text_pos,
-      priority      = opts.virt_text_priority,
-      hl_mode       = 'combine',
-    })
+    vim.b[bufnr].gitsigns_blame_line = flatten_virt_text(virt_text)
+
+    if opts.virt_text then
+      set_extmark(bufnr, lnum, {
+        virt_text     = virt_text,
+        virt_text_pos = opts.virt_text_pos,
+        priority      = opts.virt_text_priority,
+        hl_mode       = 'combine',
+      })
+    end
   end
 end)
 

types/types.d.tl

@@ -410,6 +410,7 @@ global record vim
     gitsigns_status_dict: {string:any}
     gitsigns_status: string
     gitsigns_blame_line_dict: {string:any}
+    gitsigns_blame_line: string
   end
 
   b: BufVar