summaryrefslogtreecommitdiffstats
path: root/scripts/metadata_filter.lua
blob: 8eedc63767659691d361e4bd989295fad3df95bc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
function format_date(date)
    if date == nil then return date end

    date = pandoc.utils.normalize_date(pandoc.utils.stringify(date))
    local year, month, day = date:match("(%d%d%d%d)-(%d%d)-(%d%d)")
    if year == nil then return nil end

    local time = os.time({
        year = tonumber(year),
        month = tonumber(month),
        day = tonumber(day)
    })
    return pandoc.MetaMap({
        yyyy_mm_dd = pandoc.MetaString(os.date("%F", time)),
        yyyy = pandoc.MetaString(os.date("%Y", time)),
        mm = pandoc.MetaString(os.date("%m", time)),
        dd = pandoc.MetaString(os.date("%d", time)),
        rfc3339 = pandoc.MetaString(os.date("%FT%T+00:00", time))
    })
end

function table_to_list(t, cmp)
    local l = pandoc.List()

    for key, value in pairs(t) do
        l:insert(pandoc.MetaMap({key = key, value = value}))
    end

    l:sort(cmp or function(i1, i2) return i1.key < i2.key end)

    return l
end

function group_by(l, field, insert)
    insert = insert or function(group, _, item)
        if not group then
            group = l:new({item})
            return group
        end
        group:insert(item)
    end

    local groups = {}

    for i = 1, #l do
        local item = l[i]
        local f = field(item)

        if f ~= nil then
            local out = insert(groups[f], f, item)
            if out ~= nil then groups[f] = out end
        end
    end

    return groups
end

function splitstr(input, sep)
    sep = sep or "%s"
    local t = {}
    for str in input:gmatch("([^" .. sep .. "]+)") do table.insert(t, str) end
    return t
end

function relative_to(dir, target)
    dir = splitstr(dir, "/")
    target = splitstr(target, "/")

    local prefix = true
    local path = ""

    for i = 1, math.min(#dir, #target) do
        local t = target[i]
        if prefix then
            if dir[i] ~= t then
                prefix = false
                path = "../" .. t
            end
        else
            path = "../" .. path .. "/" .. t
        end
    end

    if #dir < #target then
        for i = #dir + 1, #target do
            path = path .. (path == "" and "" or "/") .. target[i]
        end
    elseif #dir > #target then
        for _ = #target + 1, #dir do path = "../" .. path end
    end

    return path
end

function apply_path_rewrites(rewrites, str)
    for i = 1, #rewrites.path do
        local r = rewrites.path[i]
        str = str:gsub(pandoc.utils.stringify(r.from),
                       pandoc.utils.stringify(r.to))
    end
    return str
end

function get_file_out(rewrites, content_dir, file_in)
    local file_out = file_in:gsub("^" .. content_dir, ""):gsub("%.md$", ".html")

    if file_out:match(".html$") and not file_out:match("/index%.html$") then
        file_out = file_out:gsub("/(.*)%.html$", "/%1/index.html")
    end

    file_out = apply_path_rewrites(rewrites, file_out)

    return pandoc.MetaString(file_out)
end

function make_absolute(rel, base)
    return
        rel:find("^/") ~= nil and rel or base:gsub("^(.*)/.-$", "%1") .. "/" ..
            rel
end

function resolve_url(site_url, ref_file, target_file)
    target_file = target_file:gsub("/index%.html$", "/")

    local ref_base_dir = ref_file:gsub("^(.*)/.-$", "%1")
    local abs = target_file
    local rel = relative_to(ref_base_dir, abs):gsub("/index%.html$", "/")

    return pandoc.MetaMap({
        abs = pandoc.MetaString(abs),
        rel = pandoc.MetaString(rel),
        full = pandoc.MetaString(site_url .. abs)
    })
end

function resolve_layout(layout)
    if layout then
        layout = pandoc.utils.stringify(layout)
        return pandoc.MetaMap({
            id = pandoc.MetaString(layout),
            ["is_" .. layout] = pandoc.MetaBool(true)
        })
    end
end

function resolve_section(content_dir, file_in)
    local section = file_in:gsub("^" .. content_dir, ""):match("^/(.-)[/.]") or
                        "index"
    return pandoc.MetaMap({
        id = pandoc.MetaString(section),
        ["is_" .. section] = pandoc.MetaBool(true)
    })
end

function resolve_category(categories, category)
    if categories and category then
        category = pandoc.utils.stringify(category)
        data = pandoc.MetaMap(categories[category])
        data.id = pandoc.MetaString(category)
        return data
    end
end

function prep_main_menu(rewrites, section, main_menu)
    local active_item = nil

    for i = 1, #main_menu do
        local item = main_menu[i]
        local active = pandoc.utils.stringify(item.id) == section.id
        item.active = pandoc.MetaBool(active)
        item.url = apply_path_rewrites(rewrites,
                                       pandoc.utils.stringify(item.url))
        if active then active_item = item end
    end

    return pandoc.MetaMap({
        items = main_menu:filter(function(item)
            return not item.hidden or item.active
        end),
        active = active_item
    })
end

function organize_subpages(site_url, ref_file, pages)
    for i = 1, #pages do
        local page = pages[i]
        page.url = resolve_url(site_url, ref_file,
                               pandoc.utils.stringify(page.file_out))
    end

    local pages_grouped_date =
        group_by(pages, function(p) return not p.date end)

    local pages_undated = pages_grouped_date[true] or pandoc.MetaList({})
    pages_undated:sort(function(p1, p2)
        return pandoc.utils.stringify(p1.title) <
                   pandoc.utils.stringify(p2.title)
    end)

    local pages_dated = pages_grouped_date[false] or pandoc.MetaList({})
    pages_dated:sort(function(p1, p2)
        return pandoc.utils.stringify(p1.date.yyyy_mm_dd) >
                   pandoc.utils.stringify(p2.date.yyyy_mm_dd)
    end)

    local pages_categorized = pages:filter(
                                  function(p) return p.category ~= nil end)
    pages_categorized:sort(function(p1, p2)
        return pandoc.utils.stringify(p1.title) <
                   pandoc.utils.stringify(p2.title)
    end)

    local pages_by_year = group_by(pages_dated, function(p)
        return pandoc.utils.stringify(p.date.yyyy)
    end)
    pages_by_year = pandoc.MetaList(table_to_list(pages_by_year,
                                                  function(i1, i2)
        return i1.key > i2.key
    end))

    local pages_by_category = group_by(pages_categorized, function(p)
        return pandoc.utils.stringify(p.category.id)
    end)
    pages_by_category = pandoc.MetaList(table_to_list(pages_by_category,
                                                      function(i1, i2)
        return i1.key < i2.key
    end))

    local pages_data = pandoc.MetaMap({
        all_dated = pages_dated,
        all_undated = pages_undated,
        by_year = pages_by_year,
        by_category = pages_by_category,
        last_update = #pages_dated ~= 0 and pages_dated[1].last_update
    })

    local categories_data = group_by(pages_categorized, function(p)
        return p.category and pandoc.utils.stringify(p.category.id)
    end, function(stats, _, p)
        if not stats then
            return {name = pandoc.MetaString(p.category.name), count = 1}
        else
            stats.count = stats.count + 1
        end
    end)
    categories_data = pandoc.MetaList(table_to_list(categories_data))

    for i = 1, #categories_data do
        categories_data[i].value.count =
            pandoc.MetaString(("%d"):format(categories_data[i].value.count))
    end

    return pages_data, categories_data
end

function Meta(meta)
    meta.content_dir = meta.content_dir:gsub("/$", "")
    meta.site.url = pandoc.utils.stringify(meta.site.url):gsub("/$", "")
    meta.rewrites = meta.rewrites or
                        pandoc.MetaMap({path = pandoc.MetaList({})})
    meta.page_type = meta.page_type or "page"
    meta.layout = resolve_layout(meta.layout)
    meta.section = resolve_section(meta.content_dir, meta.file_in)

    meta.file_out = get_file_out(meta.rewrites, meta.content_dir, meta.file_in)
    if meta.relative_to == nil then meta.relative_to = meta.file_in end
    meta.relative_to_out = get_file_out(meta.rewrites, meta.content_dir,
                                        meta.relative_to)

    meta.url = resolve_url(meta.site.url, meta.relative_to_out, meta.file_out)
    if meta.preview ~= nil then
        meta.preview = resolve_url(meta.site.url, meta.relative_to_out,
                                   make_absolute(
                                       pandoc.utils.stringify(meta.preview),
                                       meta.file_out))
    end

    meta.date = format_date(meta.date)
    if meta.last_update ~= nil then
        meta.last_update = format_date(meta.last_update)
    else
        meta.last_update = meta.date
    end

    meta.category = resolve_category(meta.categories[meta.section.id],
                                     meta.category)
    meta.categories = nil

    if meta.page_type == "feed" then
        meta.page = pandoc.MetaMap({
            url = resolve_url(meta.site.url, meta.relative_to_out,
                              meta.file_out:gsub("%.xml$", ".html"))
        })
    end

    if meta.create_feed then
        meta.feed = pandoc.MetaMap({
            url = resolve_url(meta.site.url, meta.relative_to_out,
                              meta.file_out:gsub("%.html$", ".xml"))
        })
    end

    if meta.menus and meta.menus.main then
        meta.menus.main = prep_main_menu(meta.rewrites, meta.section,
                                         meta.menus.main)
    end

    if meta.pages then
        local pages, categories = organize_subpages(meta.site.url,
                                                    meta.relative_to_out,
                                                    meta.pages)
        meta.pages = pages
        meta.categories = categories
    end

    return meta
end