From af0708dbda5b7e548180845b3a7d07195124bd41 Mon Sep 17 00:00:00 2001
From: Liquidmantis <liquidmantis@gmail.com>
Date: Fri, 10 Dec 2021 21:18:37 -0700
Subject: [PATCH] add date offsets for note templates

---
 README.md          |  4 ++++
 lua/telekasten.lua | 16 ++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 55d3eb9..97853ac 100644
--- a/README.md
+++ b/README.md
@@ -617,8 +617,12 @@ Currently, the following substitutions will be made during new note creation:
 | --- | --- | --- |
 | `{{title}}` | the title of the note | My new note |
 | `{{date}}` | date in iso format | 2021-11-21 |
+| `{{yesterday}}` | yesterday's date in iso format | 2021-11-20 |
+| `{{tomorrow}}` | tomorrow's date in iso format | 2021-11-22 |
 | `{{hdate}}` | date in long format | Sunday, November 21st, 2021 |
 | `{{week}}` | week of the year | 46 |
+| `{{lastweek}}` | prior week of the year | 45 |
+| `{{nextweek}}` | next week of the year | 47 |
 | `{{year}}` | year | 2021 |
 
 As an example, this is my template for new notes:
diff --git a/lua/telekasten.lua b/lua/telekasten.lua
index 4267998..bf48d47 100644
--- a/lua/telekasten.lua
+++ b/lua/telekasten.lua
@@ -194,8 +194,14 @@ local monthmap = {
 
 local function calenderinfo_today()
     local dinfo = os.date("*t")
+    local oneday = 24 * 60 * 60 -- hours * days * seconds
+    local oneweek = 7 * oneday
+    local date_format = "%Y-%m-%d"
+    local week_format = "%V"
     local opts = {}
-    opts.date = os.date("%Y-%m-%d")
+    opts.date = os.date(date_format)
+    opts.yesterday = os.date(date_format, os.time() - oneday)
+    opts.tomorrow = os.date(date_format, os.time() + oneday)
     local wday = dinfo.wday - 1
     if wday == 0 then
         wday = 7
@@ -211,7 +217,9 @@ local function calenderinfo_today()
         .. daysuffix(dinfo.day)
         .. ", "
         .. dinfo.year
-    opts.week = os.date("%V")
+    opts.week = os.date(week_format)
+    opts.lastweek = os.date(week_format, os.time() - oneweek)
+    opts.nextweek = os.date(week_format, os.time() + oneweek)
     opts.month = dinfo.month
     opts.year = dinfo.year
     opts.day = dinfo.day
@@ -222,6 +230,10 @@ local function linesubst(line, title, calendar_info)
     local cinfo = calendar_info or calenderinfo_today()
     local substs = {
         date = cinfo.date,
+        yesterday = cinfo.yesterday,
+        tomorrow = cinfo.tomorrow,
+        lastweek = cinfo.lastweek,
+        nextweek = cinfo.nextweek,
         hdate = cinfo.hdate,
         week = cinfo.week,
         year = cinfo.year,