Add get_line api wrapper method

Should enable somewhat easier testing and reasoning
about my code.

lua/zettelkasten/action_spec.lua

@@ -112,6 +112,7 @@ describe("create_link", function()
         --     getpos = function() return {0, 0, 0, 0} end,
         --     getline = function() return "testline" end
         -- }
+        pending()
         vim.cmd = function() end
         action.create_link("my selection", 1, 1, 37)
     end)

lua/zettelkasten/text.lua

@@ -17,18 +17,18 @@ end
 -- delimited word, otherwise the vim specified wordboundary word.
 function T.get_current_word(big)
     local pattern = [[\k]]
-    if not big then
-        pattern = [[\S]]
-    end
+    if not big then pattern = [[\S]] end
 
     local cur_col = vim.api.nvim_win_get_cursor(0)[2]
     local line = vim.api.nvim_get_current_line()
 
-    local word_before_cur = vim.fn.matchstrpos(line:sub(1, cur_col + 1), pattern .. "*$")
+    local word_before_cur = vim.fn.matchstrpos(line:sub(1, cur_col + 1),
+                                               pattern .. "*$")
     local word_start_col = word_before_cur[2] + 1
     word_before_cur = word_before_cur[1]
 
-    local word_after_cur = vim.fn.matchstr(line:sub(cur_col + 1), "^" .. pattern .."*"):sub(2)
+    local word_after_cur = vim.fn.matchstr(line:sub(cur_col + 1),
+                                           "^" .. pattern .. "*"):sub(2)
 
     return word_before_cur .. word_after_cur, word_start_col
 end
@@ -83,4 +83,15 @@ function T.replace_text(text, new_text, start_col)
     return line_edited
 end
 
+--- Return editor line contents.
+-- Returns the content of the line number passed in or the currently active
+-- line if no number passed in. Lines are, as per neovim function,
+-- *zero-indexed* compared to what you see in e.g. the editor sidebar.
+--- @param linenr number
+--- @return string
+function T.get_line(linenr)
+    if linenr then return vim.api.nvim_buf_get_lines(0, linenr, linenr + 1) end
+    return vim.api.nvim_get_current_line()
+end
+
 return T

lua/zettelkasten/text_spec.lua

@@ -0,0 +1,32 @@
+local t = require 'zettelkasten.text'
+
+before_each(function() _G.vim = {g = {}, b = {}} end)
+after_each(function() _G.vim = nil end)
+
+describe("get_line", function()
+    it("returns current line contents if no line nr passed", function()
+        vim.api = {
+            nvim_get_current_line = function()
+                return "hello my old friend"
+            end
+        }
+        assert.same("hello my old friend", t.get_line())
+    end)
+    it("returns zero-indexed line contents", function()
+        vim.api = {
+            nvim_buf_get_lines = function(...)
+                local args = table.pack(...)
+                if args[1] == 0 and args[2] + 1 == args[3] then
+                    return "hello my new enemy"
+                end
+                return "wrong arguments"
+            end
+        }
+        assert.same("hello my new enemy", t.get_line(1))
+    end)
+end)
+
+-- describe("Zettelkasten", function()
+--     it("should create an anchor for the current datetime",
+--        function() assert.same(os.date('%y%m%d%H%M'), ZK.create_anchor()) end)
+-- end)