move lua scripts into a separate directory

lib-lua/taginfo.lua

@@ -0,0 +1,75 @@
+-- Prints taginfo project description in the standard output
+--
+
+-- create fake "osm2pgsql" table for flex-base, originally created by the main C++ program
+osm2pgsql = {}
+function osm2pgsql.define_table(...) end
+
+-- provide path to flex-style lua file
+package.path = arg[0]:match("(.*/)") .. "?.lua;" .. package.path
+local flex = require('import-extratags')
+local json = require ('dkjson')
+
+
+------------ helper functions ---------------------
+
+function get_key_description(key, description)
+    local desc = {}
+    desc.key = key
+    desc.description = description
+    set_keyorder(desc, {'key', 'description'})
+    return desc
+end
+
+-- Sets the key order for the resulting JSON table
+function set_keyorder(table, order)
+    setmetatable(table, {
+        __jsonorder = order
+    })
+end
+
+
+-- Prints the collected tags in the required format in JSON
+function print_taginfo()
+    local tags = {}
+
+    for _, k in ipairs(flex.TAGINFO_MAIN.keys) do
+        local desc = get_key_description(k, 'POI/feature in the search database')
+        if flex.TAGINFO_MAIN.delete_tags[k] ~= nil then
+            desc.description = string.format('%s (except for values: %s).', desc.description,
+                                table.concat(flex.TAGINFO_MAIN.delete_tags[k], ', '))
+        end
+        table.insert(tags, desc)
+    end
+
+    for k, _ in pairs(flex.TAGINFO_NAME_KEYS) do
+        local desc = get_key_description(k, 'Searchable name of the place.')
+        table.insert(tags, desc)
+    end
+    for k, _ in pairs(flex.TAGINFO_ADDRESS_KEYS) do
+        local desc = get_key_description(k, 'Used to determine the address of a place.')
+        table.insert(tags, desc)
+    end
+
+    local format = {
+        data_format = 1,
+        data_url = 'https://nominatim.openstreetmap.org/taginfo.json',
+        project = {
+            name = 'Nominatim',
+            description = 'OSM search engine.',
+            project_url = 'https://nominatim.openstreetmap.org',
+            doc_url = 'https://nominatim.org/release-docs/develop/',
+            contact_name = 'Sarah Hoffmann',
+            contact_email = 'lonvia@denofr.de'
+        }
+    }
+    format.tags = tags
+
+    set_keyorder(format, {'data_format', 'data_url', 'project', 'tags'})
+    set_keyorder(format.project, {'name', 'description', 'project_url', 'doc_url',
+                    'contact_name', 'contact_email'})
+
+    print(json.encode(format))
+end
+
+print_taginfo()