add version subcommand

Cargo.toml

@@ -32,12 +32,12 @@ eula = false
 
 [dependencies]
 color-eyre = "0.6.3"
-clap = { version = "4.5.20", features = ["derive"] }
-regex = { version = "1.11.0", default-features = false, features = ["std"] }
+clap = { version = "4.5.21", features = ["derive"] }
+regex = { version = "1.11.1", default-features = false, features = ["std"] }
 libc = "0.2.161"
 log = { version = "0.4.22", features = ["std"] }
-serde = { version = "1.0.210", features = ["derive"] }
-serde_json = "1.0.131"
+serde = { version = "1.0.215", features = ["derive"] }
+serde_json = "1.0.132"
 toml = "0.8.19"
 derive_more = { version = "1.0.0", features = ["full"] }
 itertools = "0.13.0"
@@ -49,8 +49,8 @@ serde-inline-default = "0.2.2"
 hostname = "0.4.0"
 walkdir = "2.5.0"
 toml_edit = "0.22.22"
-which = '7.0.0'
 tempfile = "3.14.0"
+strum = {version = "0.26.3", features = ["derive"]}
 
 [dev-dependencies]
 assert_cmd = "2.0.16"

src/backends/all.rs

@@ -35,11 +35,16 @@ macro_rules! to_package_ids {
 
 macro_rules! any {
     ($(($upper_backend:ident, $lower_backend:ident)),*) => {
-        #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, derive_more::FromStr, derive_more::Display)]
+        #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, derive_more::FromStr, derive_more::Display, strum::EnumIter)]
         pub enum AnyBackend {
             $($upper_backend,)*
         }
         impl AnyBackend {
+            pub fn version(&self, config: &Config) -> Result<String> {
+                match self {
+                    $( AnyBackend::$upper_backend => $upper_backend::version(config), )*
+                }
+            }
             pub fn remove_packages(&self, packages: &BTreeSet<String>, no_confirm: bool, config: &Config) -> Result<()> {
                 match self {
                     $( AnyBackend::$upper_backend => $upper_backend::remove_packages(packages, no_confirm, config), )*
@@ -48,6 +53,7 @@ macro_rules! any {
         }
     };
 }
+
 apply_public_backends!(any);
 
 macro_rules! raw_package_ids {

src/backends/apt.rs

@@ -3,7 +3,7 @@ use std::collections::{BTreeMap, BTreeSet};
 use color_eyre::Result;
 use serde::{Deserialize, Serialize};
 
-use crate::cmd::{command_found, run_command, run_command_for_stdout};
+use crate::cmd::{run_command, run_command_for_stdout};
 use crate::prelude::*;
 
 #[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, derive_more::Display)]
@@ -26,8 +26,8 @@ impl Backend for Apt {
         Ok(packages)
     }
 
-    fn query_installed_packages(_: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
-        if !command_found("apt-mark") {
+    fn query_installed_packages(config: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
+        if Self::version(config).is_err() {
             return Ok(BTreeMap::new());
         }
 
@@ -37,7 +37,7 @@ impl Backend for Apt {
         // designed with this use-case in mind so there are lots and
         // lots of different methods all of which seem to have
         // caveats.
-        let explicit = run_command_for_stdout(["apt-mark", "showmanual"], Perms::Same)?;
+        let explicit = run_command_for_stdout(["apt-mark", "showmanual"], Perms::Same, false)?;
 
         Ok(explicit
             .lines()
@@ -76,4 +76,8 @@ impl Backend for Apt {
 
         Ok(())
     }
+
+    fn version(_: &Config) -> Result<String> {
+        run_command_for_stdout(["apt", "--version"], Perms::Same, false)
+    }
 }

src/backends/arch.rs

@@ -3,7 +3,7 @@ use serde::{Deserialize, Serialize};
 use serde_inline_default::serde_inline_default;
 use std::collections::{BTreeMap, BTreeSet};
 
-use crate::cmd::{command_found, run_command, run_command_for_stdout};
+use crate::cmd::{run_command, run_command_for_stdout};
 use crate::prelude::*;
 
 #[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, derive_more::Display)]
@@ -27,7 +27,7 @@ impl Backend for Arch {
         mut packages: BTreeMap<String, Self::InstallOptions>,
         config: &Config,
     ) -> Result<BTreeMap<String, Self::InstallOptions>> {
-        if !command_found(config.arch_package_manager.as_command()) {
+        if Self::version(config).is_err() {
             return Ok(BTreeMap::new());
         }
 
@@ -39,6 +39,7 @@ impl Backend for Arch {
                 "--quiet",
             ],
             Perms::Same,
+            false,
         )?;
 
         for group in groups.lines() {
@@ -52,6 +53,7 @@ impl Backend for Arch {
                         group,
                     ],
                     Perms::Same,
+                    false,
                 )?;
 
                 for group_package in group_packages.lines() {
@@ -92,7 +94,7 @@ impl Backend for Arch {
     }
 
     fn query_installed_packages(config: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
-        if !command_found(config.arch_package_manager.as_command()) {
+        if Self::version(config).is_err() {
             return Ok(BTreeMap::new());
         }
 
@@ -104,6 +106,7 @@ impl Backend for Arch {
                 "--quiet",
             ],
             Perms::Same,
+            false,
         )?;
 
         let mut result = BTreeMap::new();
@@ -168,6 +171,7 @@ impl Backend for Arch {
                     "--quiet",
                 ],
                 Perms::Same,
+                false,
             )?;
             let orphans = orphans_output.lines();
 
@@ -187,4 +191,12 @@ impl Backend for Arch {
 
         Ok(())
     }
+
+    fn version(config: &Config) -> Result<String> {
+        run_command_for_stdout(
+            [config.arch_package_manager.as_command(), "--version"],
+            Perms::Same,
+            false,
+        )
+    }
 }

src/backends/brew.rs

@@ -3,7 +3,7 @@ use std::collections::{BTreeMap, BTreeSet};
 use color_eyre::Result;
 use serde::{Deserialize, Serialize};
 
-use crate::cmd::{command_found, run_command, run_command_for_stdout};
+use crate::cmd::{run_command, run_command_for_stdout};
 use crate::prelude::*;
 
 #[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, derive_more::Display)]
@@ -26,14 +26,15 @@ impl Backend for Brew {
         Ok(packages)
     }
 
-    fn query_installed_packages(_: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
-        if !command_found("brew") {
+    fn query_installed_packages(config: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
+        if Self::version(config).is_err() {
             return Ok(BTreeMap::new());
         }
 
         let explicit = run_command_for_stdout(
             ["brew", "list", "-1", "--quiet", "--installed-on-request"],
             Perms::Same,
+            false,
         )?;
 
         Ok(explicit
@@ -71,4 +72,8 @@ impl Backend for Brew {
 
         Ok(())
     }
+
+    fn version(_: &Config) -> Result<String> {
+        run_command_for_stdout(["brew", "--version"], Perms::Same, false)
+    }
 }

src/backends/cargo.rs

@@ -7,7 +7,7 @@ use serde::{Deserialize, Serialize};
 use serde_inline_default::serde_inline_default;
 use serde_json::Value;
 
-use crate::cmd::{command_found, run_command};
+use crate::cmd::{run_command, run_command_for_stdout};
 use crate::prelude::*;
 
 #[derive(Debug, Copy, Clone, Default, PartialEq, Eq, PartialOrd, Ord, derive_more::Display)]
@@ -45,8 +45,8 @@ impl Backend for Cargo {
         Ok(packages)
     }
 
-    fn query_installed_packages(_: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
-        if !command_found("cargo") {
+    fn query_installed_packages(config: &Config) -> Result<BTreeMap<String, Self::QueryInfo>> {
+        if Self::version(config).is_err() {
             return Ok(BTreeMap::new());
         }
 
@@ -113,6 +113,10 @@ impl Backend for Cargo {
 
         Ok(())
     }
+
+    fn version(_: &Config) -> Result<String> {
+        run_command_for_stdout(["cargo", "--version"], Perms::Same, false)
+    }
 }
 
 fn extract_packages(contents: &str) -> Result<BTreeMap<String, CargoQueryInfo>> {