feat(config): add date_format option for file history panel (sindrets#525)

Control how dates are displayed in the file history panel:
- "auto" (default): relative for recent commits (< 3 months), ISO for old
- "relative": always show relative dates (e.g., "2 days ago")
- "iso": always show ISO dates

Author: dlyongemallo

doc/diffview_defaults.txt

@@ -84,6 +84,7 @@ DEFAULT CONFIG                                  *diffview.defaults*
         height = 16,
         win_opts = {},
       },
+      date_format = "auto", -- Date format: "auto" | "relative" | "iso"
     },
     commit_log_panel = {
       win_config = {},  -- See |diffview-config-win_config|

lua/diffview/config.lua

@@ -116,6 +116,7 @@ M.defaults = {
       win_opts = {}
     },
     commit_subject_max_length = 72, -- Max length for commit subject display.
+    date_format = "auto", -- Date format: "auto" (relative for recent, ISO for old), "relative", or "iso".
   },
   commit_log_panel = {
     win_config = {

lua/diffview/scene/views/file_history/render.lua

@@ -157,12 +157,20 @@ local function render_entries(panel, parent, entries, updating)
     )
 
     if entry.commit then
-      -- 3 months
-      local date = (
-        os.difftime(os.time(), entry.commit.time) > 60 * 60 * 24 * 30 * 3
-          and entry.commit.iso_date
-          or entry.commit.rel_date
-      )
+      local date_format = config.get_config().file_history_panel.date_format
+      local date
+      if date_format == "relative" then
+        date = entry.commit.rel_date
+      elseif date_format == "iso" then
+        date = entry.commit.iso_date
+      else
+        -- "auto": show relative for recent commits (< 3 months), ISO for older.
+        date = (
+          os.difftime(os.time(), entry.commit.time) > 60 * 60 * 24 * 30 * 3
+            and entry.commit.iso_date
+            or entry.commit.rel_date
+        )
+      end
       comp:add_text(" " .. entry.commit.author .. ", " .. date, "DiffviewFilePanelPath")
     end