Initial Commit

* Adds Readme
* Adds CLI & TerminalUI programs

README.md

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+## V-Cowin
+Bunch of programs writtern in V Programming Language for Vaccine availability checking utilizing Co-WIN Public APIs
+
+### Usage
+Command Line
+```v
+v run ./find_session_plain 13-08-2021
+// Only shows whether vaccines are available or not (both paid & free)
+```
+If you need more details on the availability run
+```v
+v run ./find_session 13-08-2021
+//Press enter to increment dates
+```
+
+> All of the code is for learning purpose only. I will not be responsible for any error or inaccuracy in the data or any damage caused by this.

find_session.v

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+import json
+import net.http
+import os
+import time
+import term.ui as tui
+
+struct App {
+mut:
+    tui &tui.Context = 0
+    data VaccineAvailability
+	is_loading bool
+	idx int = 1
+}
+
+struct VaccineAvailability {
+mut:
+	date string
+	available_sessions []Sessions
+	state_id  int = 17
+	district_id int = 296
+}
+
+struct SessionResponse {
+	sessions []Sessions
+}
+
+struct Sessions {
+	center_id int
+	name string
+	address	string
+	state_name string
+	district_name string
+	block_name	string
+	pincode	int
+	from string
+	to string
+	lat int
+	long int
+	fee_type string
+	session_id string
+	date string
+	available_capacity int
+	available_capacity_dose1 int
+	available_capacity_dose2 int
+	fee	 string
+	allow_all_age bool
+	min_age_limit int
+	vaccine	string
+	slots []string
+}
+
+fn event(e &tui.Event, x voidptr) {
+    mut app := &App(x)
+	if e.typ == .key_down && e.code == .escape {
+        exit(0)
+    }
+
+	if e.typ == .key_down && e.code == .enter {
+		app.idx = app.idx + 1
+		mut date_of_vaccine := time.now().add_days(app.idx).get_fmt_date_str(.hyphen,.ddmmyyyy)
+		app.data.date = date_of_vaccine
+		app.find_session(app.data.district_id, app.data.date)
+	}
+}
+
+fn frame(x voidptr) {
+    mut app := &App(x)
+	app.tui.clear()
+	//Draw Area
+	app.draw_header()
+	app.draw_vaccine_availability()
+	app.tui.reset()
+    app.tui.flush()
+}
+
+fn (mut app App) draw_header() {
+	app.tui.draw_text(3,2,"Vaccine Availability on ${app.data.date} | Total Centers : ${app.data.available_sessions.len}")
+	app.tui.horizontal_separator(3)
+}
+
+fn (mut app App) draw_vaccine_availability() {
+	available_sessions := app.data.available_sessions
+	start_x := 3
+	mut start_y := 5
+	if available_sessions.len == 0 {
+		app.tui.draw_text(app.tui.window_width/2 - 10,app.tui.window_height/2,"No Vaccine Available")
+	} else {
+		for session in available_sessions {
+			fee := match session.fee_type{
+				'Free' {'Free'}
+				'Paid' { session.fee }
+				else { 'N/A' }
+			}
+			app.tui.draw_text(start_x,start_y,"${session.address} | Vaccine: ${session.vaccine} | Total Available: ${session.available_capacity} | Fee: ${fee}")
+			start_y += 2
+		}
+	}
+}
+
+fn init(x voidptr) {
+	mut app := &App(x)
+	app.find_session(app.data.district_id, app.data.date)
+}
+
+
+fn main() {
+	mut app := &App{}
+	app.tui = tui.init(
+		user_data: app
+		event_fn: event
+		frame_fn: frame
+		hide_cursor: false,
+		init_fn: init
+	)
+	mut date_of_vaccine := time.now().add_days(app.idx).get_fmt_date_str(.hyphen,.ddmmyyyy)
+	if os.args.len ==2 {
+		date_of_vaccine = os.args[1]
+	} 
+
+	println("Searching Vaccine Availability on $date_of_vaccine")
+	app.data.date = date_of_vaccine
+	app.tui.set_window_title("COWIN Vaccine Finder")
+	app.tui.run() ?
+}
+
+fn (mut app App) find_session(district_id int,date string) {
+	app.is_loading = true
+	fetch_config := http.FetchConfig{
+		header: http.new_header(
+				key : .accept_language,
+				value: 'en-US'
+		)
+	}
+
+	url := 'https://cdn-api.co-vin.in/api/v2/appointment/sessions/public/findByDistrict?district_id=$district_id&date=$date'
+
+	resp := http.fetch(url, fetch_config) or {
+		println('failed to fetch data from the server')
+		return
+	}
+
+	session_data := json.decode(SessionResponse, resp.text) or {
+		println('failed to decode session json')
+		return
+	}
+
+	app.data.available_sessions = session_data.sessions
+											.filter( it.available_capacity > 0 && it.min_age_limit<45)
+	app.is_loading = false
+}
+
+fn setup_termui() {
+	
+}

find_session_plain.v

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+import json
+import net.http
+import os
+import time
+
+struct SessionResponse {
+	sessions []Sessions
+}
+
+struct Sessions {
+	center_id int
+	name string
+	address	string
+	state_name string
+	district_name string
+	block_name	string
+	pincode	int
+	from string
+	to string
+	lat int
+	long int
+	fee_type string
+	session_id string
+	date string
+	available_capacity int
+	available_capacity_dose1 int
+	available_capacity_dose2 int
+	fee	 string
+	allow_all_age bool
+	min_age_limit int
+	vaccine	string
+	slots []string
+}
+
+
+
+fn main() {
+	//state_id := 17
+	district_id := 296
+	mut date_of_vaccine := time.now().add_days(1).get_fmt_date_str(.hyphen,.ddmmyyyy)
+	if os.args.len == 2 {
+		date_of_vaccine = os.args[1]
+	} 
+
+	println("Searching Vaccine Availability on $date_of_vaccine")
+	find_session(district_id, date_of_vaccine)
+	setup_termui()
+}
+
+fn find_session(district_id int,date string) {
+	mut available_sessions := []Sessions{}
+	fetch_config := http.FetchConfig{
+		header: http.new_header(
+				key : .accept_language,
+				value: 'en-US'
+		)
+	}
+
+	url := 'https://cdn-api.co-vin.in/api/v2/appointment/sessions/public/findByDistrict?district_id=$district_id&date=$date'
+
+	resp := http.fetch(url, fetch_config) or {
+		println('failed to fetch data from the server')
+		return
+	}
+
+	session_data := json.decode(SessionResponse, resp.text) or {
+		println('failed to decode session json')
+		return
+	}
+
+	available_sessions := session_data.sessions.filter(it.available_capacity > 0 && it.min_age_limit<45)
+
+	if available_sessions.len > 0 {
+		println("Vaccines Available 😍😎")
+	} else {
+		println("No Vaccines Available 😢")
+	}
+}
+
+fn setup_termui() {
+
+}