Default to platform-specific paths.

Author: artob

Cargo.toml

@@ -28,6 +28,7 @@ unstable = []
 asimov-module = { version = "25.0.0-dev.18", default-features = true }
 clap = { version = "4.5", default-features = false, features = [
     "std",
+    "string",
 ], optional = true }
 clientele = { version = "0.3.8", default-features = false, features = [
     "clap",

src/dir.rs

@@ -0,0 +1,4 @@
+// This is free and unencumbered software released into the public domain.
+
+#[derive(Debug)]
+pub struct SignalDir {}

src/lib.rs

@@ -7,3 +7,11 @@ extern crate alloc;
 
 mod classes;
 pub use classes::*;
+
+mod dir;
+pub use dir::*;
+
+#[cfg(feature = "std")]
+mod path;
+#[cfg(feature = "std")]
+pub use path::*;

src/path.rs

@@ -0,0 +1,33 @@
+// This is free and unencumbered software released into the public domain.
+
+extern crate std;
+
+use asimov_module::getenv;
+use std::path::PathBuf;
+
+#[cfg(unix)]
+/// See: https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages
+/// See: https://github.com/signalapp/Signal-Desktop/blob/main/CONTRIBUTING.md#the-staging-environment
+pub fn default_signal_path() -> PathBuf {
+    let mut result: PathBuf = getenv::home().unwrap().into();
+    #[cfg(target_os = "macos")]
+    result.push("Library/Application Support/Signal");
+    #[cfg(not(target_os = "macos"))]
+    result.push(".config/Signal");
+    result
+}
+
+#[cfg(windows)]
+/// See: https://support.signal.org/hc/en-us/articles/360007059752-Backup-and-Restore-Messages
+/// See: https://github.com/signalapp/Signal-Desktop/blob/main/CONTRIBUTING.md#the-staging-environment
+pub fn default_signal_path() -> PathBuf {
+    let mut result: PathBuf = getenv::appdata().unwrap().into();
+    #[cfg(target_os = "windows")]
+    result.push(r"Roaming\Signal");
+    result
+}
+
+#[cfg(all(not(unix), not(windows)))]
+pub fn default_signal_path() -> PathBuf {
+    todo!("implement default_signal_path for this platform") // TODO
+}

src/reader/main.rs

@@ -8,6 +8,7 @@ use asimov_module::{
     json::SkipNulls,
     secrecy::ExposeSecret,
 };
+use asimov_signal_module::default_signal_path;
 use clap::Parser;
 use clientele::StandardOptions;
 use rusqlite::{Connection, OpenFlags, Result};
@@ -26,7 +27,7 @@ struct Options {
     output: Option<String>,
 
     /// Path to the (unencrypted!) Signal database file
-    #[clap(value_name = "SIGNAL-DB-FILE")]
+    #[clap(value_name = "SIGNAL-DB-FILE", default_value = default_signal_path().into_os_string())]
     path: PathBuf,
 }