add pagination

blog/api.lua

@@ -1,5 +1,5 @@
 local get = {}
-get.fetch = function(user, cnd, limit)
+get.fetch = function(user, cnd, limit, order)
     local db = require("db.model").get(user,"blogs",nil)
     if not db then return nil end
     local exp = {}
@@ -10,10 +10,19 @@ get.fetch = function(user, cnd, limit)
 
     end
 
-    local cond = { exp = {["and"] = exp }, order = { ctime = "DESC" }}
+    local cond = { 
+        exp = {["and"] = exp }, 
+        order = { ctime = "DESC" },
+        fields = {
+            "id", "title", "utime", "ctime", "utimestr", "ctimestr", "rendered", "tags"
+        }    
+    }
     if limit then
         cond.limit = limit
     end
+    if order then
+        cond.order = order
+    end
     local data, sort = db:find(cond)
     db:close()
     return data, sort
@@ -26,8 +35,26 @@ get.id = function(user, id)
     return get.fetch(user, { ["="] = { id = id } }, nil)
 end
 
+get.minid = function(user)
+    local db = require("db.model").get(user,"blogs",nil)
+    local cond = { fields = { "MIN(id)" } }
+    local data = db:find(cond)
+    db:close()
+    return data[1]["MIN(id)"]
+end
+
+get.maxid = function(user)
+    local db = require("db.model").get(user,"blogs",nil)
+    local cond = { fields = { "MAX(id)" }}
+    local data = db:find(cond)
+    db:close()
+    return data[1]["MAX(id)"]
+end
+
 get.afterof = function(user, id, limit)
-    return get.fetch(user, { [">"] = { id = id } }, limit)
+    local data, sort =  get.fetch(user, { [">"] = { id = id } }, limit, { ctime = "ASC" })
+    table.sort(sort, function(a, b) return a > b end)
+    return data, sort
 end
 
 get.beforeof = function(user, id, limit)
@@ -42,9 +69,22 @@ get.prevof = function(user, id)
     return get.beforeof(user, id, 1)
 end
 
-get.bytag = function(user, b64tag, limit)
+get.bytag = function(user, b64tag, limit, action, id)
+    LAST_QUERY = b64tag
     local tag = bytes.__tostring(std.b64decode(b64tag.."=="))
-    return get.fetch(user, { ["LIKE"] = { tags = "%%"..tag.."%%" } }, limit)
+    local cond = { ["LIKE"] = { tags = "%%"..tag.."%%" } }
+    local order = nil
+    if action == "before" then
+        cond = { ["and"] = { cond, { ["<"] = {id = id} } } }
+    elseif action == "after" then
+        cond = { ["and"] = { cond, { [">"] = {id = id} } } }
+        order = { ctime = "ASC" }
+    end
+    local data, sort =  get.fetch(user, cond, limit, order)
+    if(action == "after") then
+        table.sort(sort, function(a, b) return a > b end)
+    end
+    return data, sort
 end
 
 return get

blog/assets/style.css

@@ -441,4 +441,19 @@ div.commentform {
     color:#3170B2;
     padding-top: 10px;
     padding-bottom: 10px;
+}
+div.time-travel{
+    margin-top: 10px;
+    display: flex;
+    flex-direction: row;
+    text-align: center;
+    margin-bottom: 10px;
+}
+
+div.time-travel a{
+    font-weight: bold;
+    font-size: 16px;
+    text-decoration: none;
+    flex:1;
+    color:#3170B2;
 }

blog/router.lua

@@ -1,5 +1,6 @@
 BLOG_ROOT = __ROOT__.."/blog"
-MAX_ENTRY = 10
+MAX_ENTRY = 15
+LAST_QUERY = nil
 local user = "mrsang"
 local handle = function(p)
     local args = {}
@@ -12,6 +13,8 @@ local handle = function(p)
     end
     table.sort(sort)
     local api = require("blog.api")
+    local minid = api.minid(user)
+    local maxid = api.maxid(user)
     if #args == 0 or api == nil then
         echo("Unknow request "..p)
     elseif not api[args[1]] then
@@ -23,13 +26,13 @@ local handle = function(p)
         if data == nil then
             echo("Cannot query data")
         else
-            require("blog.view").render(action, data, sort)
+            require("blog.view").render(action, data, sort, minid, maxid)
         end
     end
 end
 std.html()
 local action = REQUEST.query.action
-if not action then action = "r:top:10" end
+if not action then action = "r:top:"..MAX_ENTRY end
 local r, s = action:find("^r:")
 if r then
     handle(action:sub(s+1))

blog/view.lua

@@ -9,7 +9,7 @@ view.html = function(name)
     end
 end
 
-view.render = function(action, data, sort)
+view.render = function(action, data, sort, min, max)
     local path = BLOG_ROOT.."/view"
     local fn = nil
     local e
@@ -25,7 +25,7 @@ view.render = function(action, data, sort)
         fn, e = loadscript(path.."/entries.ls")
     end
     if fn then
-        local r,o = pcall(fn, data, sort)
+        local r,o = pcall(fn, data, sort, min, max, action)
         if not r then
             echo(o)
         end

blog/view/detail.ls

@@ -22,7 +22,7 @@
 <?lua
         return
     else
-        data = data[0]
+        data = data[1]
         content = bytes.__tostring(std.b64decode(data.rendered)):gsub("%%","%%%%")
         local a,b = content:find("<[Hh]1[^>]*>")
         if a then

blog/view/entries.ls

@@ -2,7 +2,12 @@
     local arg = {...}
     local datas = arg[1]
     local order = arg[2]
+    local minid = arg[3]
+    local maxid = arg[4]
+    local action = arg[5]
     local class = "card"
+    local first_id = nil
+    local last_id = nil
     if HEADER.mobile then
         class = "card mobile"
     end
@@ -22,6 +27,8 @@
 
     for idx,v in pairs(order) do
         local data = datas[v]
+        if not last_id then last_id = data.id end
+        first_id = data.id
 ?>
 <div class = "<?=class?>">
     <div class = "side">
@@ -81,4 +88,22 @@
 </div>
 <?lua
     end
+    local beforelk = "./r:beforeof:"..first_id..":"..MAX_ENTRY
+    local afterlk = "./r:afterof:"..last_id..":"..MAX_ENTRY
+    if action == "bytag" or action == "search" then
+        beforelk = "./r:"..action..":"..LAST_QUERY..":"..MAX_ENTRY..":before:"..first_id
+        afterlk = "./r:"..action..":"..LAST_QUERY..":"..MAX_ENTRY..":after:"..last_id
+    end
 ?>
+<div class = "time-travel">
+<?lua
+    if first_id ~= minid then
+?>
+<a href = "<?=beforelk?>" class = "past"><< Older posts</a>
+<?lua
+    end
+    if last_id ~= maxid then
+?>
+<a href = "<?=afterlk?>" class = "future">Newer posts >></a>
+<?lua end ?>
+</div>

index.ls

@@ -12,8 +12,8 @@
     if db == nil then die("cannot get db data") end
     local data, a = db:getAll()
     db:close()
-    if data == nil or data[0] == nil then die("Cannot fetch user info") end
-    data = data[0]
+    if data == nil or data[1] == nil then die("Cannot fetch user info") end
+    data = data[1]
 ?>
 <!DOCTYPE html>
 <html lang="en">

info/index.ls

@@ -18,8 +18,8 @@
     if db == nil then die("cannot get db data") end
     local data, a = db:getAll()
     db:close()
-    if data == nil or data[0] == nil then die("Cannot fetch user info") end
-    data = data[0]
+    if data == nil or data[1] == nil then die("Cannot fetch user info") end
+    data = data[1]
 ?>
 <html>
     <head>