feat: Allow overriding actions from mappings (#248)

lua/tests/automated/action_spec.lua

@@ -0,0 +1,164 @@
+require('plenary.test_harness'):setup_busted()
+
+local transform_mod = require('telescope.actions.mt').transform_mod
+
+local eq = function(a, b)
+  assert.are.same(a, b)
+end
+
+describe('actions', function()
+  it('should allow creating custom actions', function()
+    local a = transform_mod {
+      x = function() return 5 end,
+    }
+
+
+    eq(5, a.x())
+  end)
+
+  it('allows adding actions', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local x_plus_y = a.x + a.y
+
+    eq({"x", "y"}, {x_plus_y()})
+  end)
+
+  it('ignores nils from added actions', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+      nil_maker = function() return nil end,
+    }
+
+    local x_plus_y = a.x + a.nil_maker + a.y
+
+    eq({"x", "y"}, {x_plus_y()})
+  end)
+
+  it('allows overriding an action', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    -- actions.file_goto_selection_edit:replace(...)
+    a.x:replace(function() return "foo" end)
+    eq("foo", a.x())
+
+    a._clear()
+    eq("x", a.x())
+  end)
+
+  it('enhance.pre', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local called_pre = false
+
+    a.y:enhance {
+      pre = function()
+        called_pre = true
+      end,
+    }
+    eq("y", a.y())
+    eq(true, called_pre)
+  end)
+
+  it('enhance.post', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local called_post = false
+
+    a.y:enhance {
+      post = function()
+        called_post = true
+      end,
+    }
+    eq("y", a.y())
+    eq(true, called_post)
+  end)
+
+  it('can call both', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local called_count = 0
+    local count_inc = function()
+      called_count = called_count + 1
+    end
+
+    a.y:enhance {
+      pre = count_inc,
+      post = count_inc,
+    }
+
+    eq("y", a.y())
+    eq(2, called_count)
+  end)
+
+  it('can call both even when combined', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local called_count = 0
+    local count_inc = function()
+      called_count = called_count + 1
+    end
+
+    a.y:enhance {
+      pre = count_inc,
+      post = count_inc,
+    }
+
+    a.x:enhance {
+      post = count_inc
+    }
+
+    local x_plus_y = a.x + a.y
+    x_plus_y()
+
+    eq(3, called_count)
+  end)
+
+  it('clears enhance', function()
+    local a = transform_mod {
+      x = function() return "x" end,
+      y = function() return "y" end,
+    }
+
+    local called_post = false
+
+    a.y:enhance {
+      post = function()
+        called_post = true
+      end,
+    }
+
+    a._clear()
+
+    eq("y", a.y())
+    eq(false, called_post)
+  end)
+
+  it('handles passing arguments', function()
+    local a = transform_mod {
+      x = function(bufnr) return string.format("bufnr: %s") end,
+    }
+
+    a.x:replace(function(bufnr) return string.format("modified: %s", bufnr) end)
+    eq("modified: 5", a.x(5))
+  end)
+end)