Initial import

.gitignore

@@ -0,0 +1 @@
+tz

README.md

@@ -0,0 +1,18 @@
+# 🌐 A time zone helper
+
+tz helps you schedule things across time zones. It is an interactive TUI
+program that displays time across a few time zones of your choosing.
+
+# Building
+
+Clone this repository and run:
+
+```
+go build .
+```
+
+# License
+
+The GPL3 license.
+
+Copyright (c) 2021 Arnaud Berthomier

config.go

@@ -0,0 +1,30 @@
+/**
+ * This file is part of tz.
+ *
+ * tz is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * tz is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with tz.  If not, see <https://www.gnu.org/licenses/>.
+ **/
+package main
+
+// Config stores app configuration
+type Config struct {
+	Zones []Zone
+}
+
+// LoadConfig from os.UserConfigDir
+func LoadConfig() (*Config, error) {
+	cfg := Config{
+		Zones: DefaultZones,
+	}
+	return &cfg, nil
+}

go.mod

@@ -0,0 +1,8 @@
+module github.com/oz/tz
+
+go 1.15
+
+require (
+	github.com/charmbracelet/bubbletea v0.12.4
+	github.com/muesli/termenv v0.7.4
+)

go.sum

@@ -0,0 +1,34 @@
+github.com/charmbracelet/bubbletea v0.12.4 h1:2cfryCnDOe7SvQF/Dj99irXKpFlfoPgQjEDdvP1pLpk=
+github.com/charmbracelet/bubbletea v0.12.4/go.mod h1:tp9tr9Dadh0PLhgiwchE5zZJXm5543JYjHG9oY+5qSg=
+github.com/containerd/console v1.0.1 h1:u7SFAJyRqWcG6ogaMAx3KjSTy1e3hT9QxqX7Jco7dRc=
+github.com/containerd/console v1.0.1/go.mod h1:XUsP6YE/mKtz6bxc+I8UiKKTP04qjQL4qcS3XoQ5xkw=
+github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4=
+github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/mattn/go-runewidth v0.0.10 h1:CoZ3S2P7pvtP45xOtBw+/mDL2z0RKI576gSkzRRpdGg=
+github.com/mattn/go-runewidth v0.0.10/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
+github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68 h1:y1p/ycavWjGT9FnmSjdbWUlLGvcxrY0Rw3ATltrxOhk=
+github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68/go.mod h1:Xk+z4oIWdQqJzsxyjgl3P22oYZnHdZ8FFTHAQQt5BMQ=
+github.com/muesli/termenv v0.7.2 h1:r1raklL3uKE7rOvWgSenmEm2px+dnc33OTisZ8YR1fw=
+github.com/muesli/termenv v0.7.2/go.mod h1:ct2L5N2lmix82RaY3bMWwVu/jUFc9Ule0KGDCiKYPh8=
+github.com/muesli/termenv v0.7.4 h1:/pBqvU5CpkY53tU0vVn+xgs2ZTX63aH5nY+SSps5Xa8=
+github.com/muesli/termenv v0.7.4/go.mod h1:pZ7qY9l3F7e5xsAOS0zCew2tME+p7bWeBkotCEcIIcc=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee h1:4yd7jl+vXjalO5ztz6Vc1VADv+S/80LGJmyl1ROJ2AI=
+golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200916030750-2334cc1a136f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634 h1:bNEHhJCnrwMKNMmOx3yAynp5vs5/gRy+XWFtZFu7NBM=
+golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

main.go

@@ -0,0 +1,141 @@
+/**
+ * This file is part of tz.
+ *
+ * tz is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * tz is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with tz.  If not, see <https://www.gnu.org/licenses/>.
+ **/
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/muesli/termenv"
+)
+
+var term = termenv.ColorProfile()
+
+type model struct {
+	zones []Zone
+	hour  int
+}
+
+func (m model) Init() tea.Cmd {
+	// Just return `nil`, which means "no I/O right now, please."
+	return nil
+}
+
+func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	switch msg := msg.(type) {
+
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "ctrl+c", "q", "esc":
+			return m, tea.Quit
+
+		case "left", "h":
+			if m.hour == 0 {
+				m.hour = 23
+			} else {
+				m.hour--
+			}
+
+		case "right", "l":
+			if m.hour > 22 {
+				m.hour = 0
+			} else {
+				m.hour++
+			}
+		}
+	}
+	return m, nil
+}
+
+func (m model) View() string {
+	s := "What time is it?\n\n"
+
+	// Show hours for each zone
+	for zi, z := range m.zones {
+		hours := strings.Builder{}
+		startAt := 0
+		if zi > 0 {
+			startAt = (z.offset - m.zones[0].offset) % 24
+		}
+
+		// A list of hours
+		for i := startAt; i < startAt+24; i++ {
+			hour := ((i % 24) + 24) % 24
+			out := termenv.String(fmt.Sprintf("%2d", hour))
+
+			out = out.Foreground(term.Color(hourColorCode(hour)))
+			// Cursor
+			if m.hour == i-startAt {
+				out = out.Background(term.Color("41")).Foreground(term.Color("#000000"))
+			}
+			hours.WriteString(out.String())
+			hours.WriteString("  ")
+		}
+
+		zoneHeader := termenv.String(fmt.Sprintf("%s %s: %s", z.ClockEmoji(), z, z.ShortDT()))
+		zoneHeader = zoneHeader.Background(term.Color("234")).Foreground(term.Color("255"))
+
+		s += fmt.Sprintf("%s\n%s\n\n", zoneHeader, hours.String())
+	}
+
+	s += "\nPress q to quit.\n"
+	return s
+}
+
+// Return a color matching the time of the day at a given hour.
+func hourColorCode(hour int) (color string) {
+	switch hour {
+	// Morning
+	case 7, 8:
+		color = "12"
+
+	// Day
+	case 9, 10, 11, 12, 13, 14, 15, 16, 17:
+		color = "11"
+
+	// Evening
+	case 18, 19:
+		color = "3"
+
+	// Night
+	default:
+		color = "17"
+	}
+	return color
+}
+
+func main() {
+	now := time.Now()
+	config, err := LoadConfig()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error loading config: %s", err)
+		os.Exit(2)
+	}
+	var initialModel = model{
+		zones: config.Zones,
+		hour:  now.Hour(),
+	}
+	p := tea.NewProgram(initialModel)
+	if err := p.Start(); err != nil {
+		fmt.Printf("Alas, there's been an error: %v", err)
+		os.Exit(1)
+	}
+
+}

zone.go

@@ -0,0 +1,94 @@
+/**
+ * This file is part of tz.
+ *
+ * tz is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * tz is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with tz.  If not, see <https://www.gnu.org/licenses/>.
+ **/
+package main
+
+import "time"
+
+var name, offset = time.Now().Zone()
+var DefaultZones = []Zone{
+	{
+		name:   "Local",
+		dbName: name,
+		offset: offset / 3600,
+	},
+	{
+		name:   "Paris",
+		dbName: "Europe/Paris",
+		offset: 1,
+	},
+	{
+		name:   "New-York",
+		dbName: "America/New_York",
+		offset: -5,
+	},
+	{
+		name:   "UTC",
+		dbName: "UTC",
+		offset: 0,
+	},
+}
+
+// EmojiClocks maps hour to the corresponding clock emoji
+var EmojiClocks = map[int]string{
+	0:  "🕛",
+	1:  "🕐",
+	2:  "🕑",
+	3:  "🕒",
+	4:  "🕓",
+	5:  "🕔",
+	6:  "🕕",
+	7:  "🕖",
+	8:  "🕗",
+	9:  "🕘",
+	10: "🕙",
+	11: "🕙",
+}
+
+// Zone stores the name of a time zone and its integer offset from UTC.
+type Zone struct {
+	dbName string // tz db name
+	name   string // custom name
+	offset int    // Integer offset from UTC
+}
+
+func (z Zone) String() string {
+	return z.name
+}
+
+// ClockEmoji returns the corresponding emoji clock for a given hour
+func (z Zone) ClockEmoji() (clock string) {
+	h := ((z.currentTime().Hour() % 12) + 12) % 12
+	return EmojiClocks[h]
+}
+
+// ShortDT returns the current time in short format.
+func (z Zone) ShortDT() string {
+	return z.currentTime().Format("3:04PM, Mon 02")
+}
+
+func (z Zone) currentTime() time.Time {
+	now := time.Now()
+	zName, _ := now.Zone()
+	if z.dbName != zName {
+		loc, err := time.LoadLocation(z.dbName)
+		if err != nil {
+			return now
+		}
+		return now.In(loc)
+	}
+	return now
+}