Load file from .config/today/main.today by default

Cargo.lock

@@ -73,6 +73,12 @@ version = "1.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "chrono"
 version = "0.4.19"
@@ -116,6 +122,26 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "directories"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f51c5d4ddabd36886dd3e1438cb358cdcb0d7c499cb99cb4ac2e38e18b5cb210"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "03d86534ed367a67548dc68113a0f5db55432fdfbb6e6f9d77704397d95d5780"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
 [[package]]
 name = "fake-simd"
 version = "0.1.2"
@@ -131,6 +157,17 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
 [[package]]
 name = "heck"
 version = "0.3.3"
@@ -277,6 +314,25 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8383f39639269cde97d255a32bdb68c047337295414940c68bdd30c2e13203ff"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "redox_users"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "528532f3d801c87aec9def2add9ca802fe569e44a544afe633765267840abe64"
+dependencies = [
+ "getrandom",
+ "redox_syscall",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.8.2"
@@ -377,6 +433,7 @@ dependencies = [
  "anyhow",
  "chrono",
  "computus",
+ "directories",
  "pest",
  "pest_derive",
  "structopt",

Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 anyhow = "1.0.45"
 chrono = "0.4.19"
 computus = "1.0.0"
+directories = "4.0.1"
 pest = "2.1.3"
 pest_derive = "2.1.0"
 structopt = "0.3.25"

src/cli.rs

@@ -1,6 +1,7 @@
 use std::path::PathBuf;
 
 use chrono::NaiveDate;
+use directories::ProjectDirs;
 use structopt::StructOpt;
 
 use crate::eval::{DateRange, EntryMode};
@@ -14,14 +15,23 @@ mod render;
 
 #[derive(Debug, StructOpt)]
 pub struct Opt {
-    #[structopt(parse(from_os_str))]
+    /// File to load
-    file: PathBuf,
+    #[structopt(short, long, parse(from_os_str))]
+    file: Option<PathBuf>,
+}
+
+fn default_file() -> PathBuf {
+    ProjectDirs::from("", "", "today")
+        .expect("could not determine config dir")
+        .config_dir()
+        .join("main.today")
 }
 
 pub fn run() -> anyhow::Result<()> {
     let opt = Opt::from_args();
 
-    let files = Files::load(&opt.file)?;
+    let file = opt.file.unwrap_or_else(default_file);
+    let files = Files::load(&file)?;
     let now = files.now().naive_local();
 
     let range = DateRange::new(