fix: Corrected tab completions for the provider flag

src/bin/gman/cli.rs

@@ -280,6 +280,27 @@ pub fn run_config_completer(current: &OsStr) -> Vec<CompletionCandidate> {
     }
 }
 
+pub fn provider_completer(current: &OsStr) -> Vec<CompletionCandidate> {
+	let cur = current.to_string_lossy();
+	match load_config() {
+		Ok(config) => {
+			config.providers
+					.iter()
+					.filter(|pc| {
+						pc.name
+							.as_ref()
+							.expect("run config has no name")
+							.starts_with(&*cur)
+					})
+					.map(|pc| {
+						CompletionCandidate::new(pc.name.as_ref().expect("provider has no name"))
+					})
+					.collect()
+		}
+		Err(_) => vec![],
+	}
+}
+
 pub fn secrets_completer(current: &OsStr) -> Vec<CompletionCandidate> {
     let cur = current.to_string_lossy();
     match load_config() {

src/bin/gman/main.rs

@@ -1,3 +1,4 @@
+use crate::cli::provider_completer;
 use crate::cli::run_config_completer;
 use crate::cli::secrets_completer;
 use anyhow::{Context, Result};
@@ -51,7 +52,7 @@ struct Cli {
     output: Option<OutputFormat>,
 
     /// Specify the secret provider to use (defaults to 'default_provider' in config (usually 'local'))
-    #[arg(long, global = true, env = "GMAN_PROVIDER", value_parser = ["local", "aws_secrets_manager", "azure_key_vault", "gcp_secret_manager", "gopass"])]
+    #[arg(long, global = true, env = "GMAN_PROVIDER", add = ArgValueCompleter::new(provider_completer))]
     provider: Option<String>,
 
     /// Specify a run profile to use when wrapping a command