feat! add a global --config option

This breaks all invocations of the Obnam client, as the option needs
to come before the subcommand name.

The benefit of this breakage is simpler, less repetitive code.

4 files changed, 22 insertions, 25 deletions

diff --git a/src/bin/obnam.rs b/src/bin/obnam.rs
index 1394b6c..bc636dc 100644
--- a/src/bin/obnam.rs
+++ b/src/bin/obnam.rs
@@ -1,4 +1,5 @@
 use log::{debug, info};
+use obnam::client::ClientConfig;
 use obnam::cmd::{backup, list, restore};
 use std::path::PathBuf;
 use structopt::StructOpt;
@@ -9,32 +10,34 @@ fn main() -> anyhow::Result<()> {
     pretty_env_logger::init();
 
     let opt = Opt::from_args();
+    let config = ClientConfig::read_config(&opt.config)?;
+
     info!("obnam starts");
     debug!("opt: {:?}", opt);
 
-    match opt {
-        Opt::Backup { config } => backup(&config, BUFFER_SIZE)?,
-        Opt::List { config } => list(&config)?,
-        Opt::Restore { config, gen_id, to } => restore(&config, &gen_id, &to)?,
+    match opt.cmd {
+        Command::Backup => backup(&config, BUFFER_SIZE)?,
+        Command::List => list(&config)?,
+        Command::Restore { gen_id, to } => restore(&config, &gen_id, &to)?,
     }
     Ok(())
 }
 
 #[derive(Debug, StructOpt)]
 #[structopt(name = "obnam-backup", about = "Simplistic backup client")]
-enum Opt {
-    Backup {
-        #[structopt(parse(from_os_str))]
-        config: PathBuf,
-    },
-    List {
-        #[structopt(parse(from_os_str))]
-        config: PathBuf,
-    },
-    Restore {
-        #[structopt(parse(from_os_str))]
-        config: PathBuf,
+struct Opt {
+    #[structopt(long, short, parse(from_os_str))]
+    config: PathBuf,
+
+    #[structopt(subcommand)]
+    cmd: Command,
+}
 
+#[derive(Debug, StructOpt)]
+enum Command {
+    Backup,
+    List,
+    Restore {
         #[structopt()]
         gen_id: String,
 
diff --git a/src/cmd/backup.rs b/src/cmd/backup.rs
index 86f1b96..178684f 100644
--- a/src/cmd/backup.rs
+++ b/src/cmd/backup.rs
@@ -3,13 +3,11 @@ use crate::fsiter::FsIterator;
 use crate::generation::Generation;
 use indicatif::{ProgressBar, ProgressStyle};
 use log::info;
-use std::path::Path;
 use tempfile::NamedTempFile;
 
 const GUESS_FILE_COUNT: u64 = 0;
 
-pub fn backup(config: &Path, buffer_size: usize) -> anyhow::Result<()> {
-    let config = ClientConfig::read_config(config)?;
+pub fn backup(config: &ClientConfig, buffer_size: usize) -> anyhow::Result<()> {
     let client = BackupClient::new(&config.server_url)?;
 
     // Create a named temporary file. We don't meed the open file
diff --git a/src/cmd/list.rs b/src/cmd/list.rs
index 1741bce..6c48244 100644
--- a/src/cmd/list.rs
+++ b/src/cmd/list.rs
@@ -1,8 +1,6 @@
 use crate::client::{BackupClient, ClientConfig};
-use std::path::Path;
 
-pub fn list(config: &Path) -> anyhow::Result<()> {
-    let config = ClientConfig::read_config(&config)?;
+pub fn list(config: &ClientConfig) -> anyhow::Result<()> {
     let client = BackupClient::new(&config.server_url)?;
 
     for gen_id in client.list_generations()? {
diff --git a/src/cmd/restore.rs b/src/cmd/restore.rs
index 27f0ce3..791bebf 100644
--- a/src/cmd/restore.rs
+++ b/src/cmd/restore.rs
@@ -14,7 +14,7 @@ use std::path::{Path, PathBuf};
 use structopt::StructOpt;
 use tempfile::NamedTempFile;
 
-pub fn restore(config: &Path, gen_id: &str, to: &Path) -> anyhow::Result<()> {
+pub fn restore(config: &ClientConfig, gen_id: &str, to: &Path) -> anyhow::Result<()> {
     // Create a named temporary file. We don't meed the open file
     // handle, so we discard that.
     let dbname = {
@@ -23,8 +23,6 @@ pub fn restore(config: &Path, gen_id: &str, to: &Path) -> anyhow::Result<()> {
         dbname
     };
 
-    let config = ClientConfig::read_config(&config).unwrap();
-
     let client = BackupClient::new(&config.server_url)?;
     let gen_chunk = client.fetch_generation(&gen_id)?;
     debug!("gen: {:?}", gen_chunk);