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/* lettersnail.go: main program
*
* Copyright (C) 2016-2018 Clemens Fries <github-lettersnail@xenoworld.de>
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"github.com/docopt/docopt.go"
"os"
"os/user"
"path/filepath"
"github.com/githubert/lettersnail/cmd"
. "github.com/githubert/lettersnail/common"
)
var usageMain =
// tag::main[]
`
Usage:
lettersnail [options] <command> [<args>...]
Options:
--workdir=WORKDIR Working directory, defaults to $HOME/lettersnail
--config=CONFIG Use the given INI file instead of .config/lettersnail.ini
--help Show this help.
The following commands are available:
next Show messages due in the next days.
check Check if a message is complete.
debug Print the effective configuration for a message, and the resulting
email message.
create Open a new message in an editor.
run Send out pending messages.
` // end::main[]
var defaultConf = Configuration{
Data: map[string]string{
CONF_DAYS: "7",
CONF_SMTP_PORT: "587",
CONF_SMTP_SERVER: "localhost",
CONF_NOT_BEFORE: "00:00",
CONF_NOT_AFTER: "23:59",
},
}
// Retrieve the user's home directory.
func userHome() string {
u, err := user.Current()
// I don't think we can go on without finding the user's home directory
if err != nil {
panic(err)
}
return u.HomeDir
}
// Retrieve the user's config home, which is either defined through the environment variable
// `XDG_CONFIG_HOME` or is assumed to be a folder called `.config` in the user's home
// directory (as retrieved by `userHome()`).
func configHome() string {
value, present := os.LookupEnv("XDG_CONFIG_HOME")
configHome := value
if !present || value == "" || !filepath.IsAbs(value) {
configHome = filepath.Join(userHome(), ".config")
}
return configHome
}
// Expand `~/`, if the working directory begins with it.
func expandTilde(conf *Configuration) {
workdir := conf.Get(CONF_WORKDIR)
if len(workdir) > 1 && workdir[0:2] == "~/" {
conf.Set(CONF_WORKDIR, filepath.Join(userHome(), workdir[2:]))
} else if len(workdir) == 1 && workdir == "~" {
conf.Set(CONF_WORKDIR, userHome())
}
}
// This will create all necessary folders in the working directory.
func createFolders(workdir string) error {
for _, dir := range []string{DIR_TODO, DIR_DONE, DIR_ERRORS, DIR_DRAFTS} {
err := os.MkdirAll(filepath.Join(workdir, dir), 0777)
if err != nil {
return err
}
}
return nil
}
// Complain about files in DIR_ERRORS.
func alertIfErrors(workdir string) {
errorsDir := filepath.Join(workdir, DIR_ERRORS)
count := 0
filepath.Walk(errorsDir, func(_ string, info os.FileInfo, _ error) error {
if info.Mode().IsRegular() {
count++
}
return nil
})
if count > 0 {
fmt.Println("There were failed messages.")
fmt.Printf("Please inspect the contents of the %s/ directory.\n", DIR_ERRORS)
}
}
func main() {
userHome := userHome()
// This is the configuration that will be cobbled together from the
// default configuration ('defaultConf'), the INI and the command line
// arguments.
sessionConf := NewConfiguration()
sessionConf.MergeWith(&defaultConf)
args, _ := docopt.Parse(usageMain, nil, true, "", true)
// Determine configuration file name, defaults to `lettersnail.ini` in
// the user's config home (usually `.config`).
if args["--config"] != nil {
sessionConf.Set(CONF_CONFIG_FILENAME, args["--config"].(string))
} else {
sessionConf.Set(CONF_CONFIG_FILENAME, filepath.Join(configHome(), "lettersnail.ini"))
}
// Determine the desired command (run, next, ...)
command := args["<command>"].(string)
// Load INI configuration. This will merge the '[default]' section with
// the optional section named after the desired command ('cmd').
sessionConf.MergeWithIni(command)
// Determine working directory, defaults to the folder `lettersnail` in
// the user's home directory. '--workdir' on the command line takes
// precedence over the 'workdir' in the INI.
if args["--workdir"] != nil {
sessionConf.Set(CONF_WORKDIR, args["--workdir"].(string))
} else {
// If no working directory is set in the INI...
if sessionConf.Get(CONF_WORKDIR) == "" {
sessionConf.Set(CONF_WORKDIR, filepath.Join(userHome, "lettersnail"))
}
}
// Expand the `~/` in workdir.
expandTilde(sessionConf)
// Make sure that all necessary folders exist.
createFolders(sessionConf.Get(CONF_WORKDIR))
// See if there are files in DIR_ERRORS and alert the user.
alertIfErrors(sessionConf.Get(CONF_WORKDIR))
commandArgs := []string{command}
commandArgs = append(commandArgs, args["<args>"].([]string)...)
switch command {
case "next":
cmd.Next(commandArgs, sessionConf)
case "create":
cmd.Create(commandArgs, sessionConf)
case "check":
cmd.Check(commandArgs, sessionConf)
case "run":
cmd.Run(commandArgs, sessionConf)
case "debug":
cmd.Debug(commandArgs, sessionConf)
}
}
|
