refactor(commands): define update queries statically

Move the pacman and checkupdates package queries into module-level
constants alongside the base package queries.

Select the appropriate update query when constructing the runtime query
list, reducing branching and keeping query definitions together.

1 files changed, 19 insertions, 21 deletions

diff --git a/prometheus_pacman_exporter/__init__.py b/prometheus_pacman_exporter/__init__.py
index e957662..c6bed96 100644
--- a/prometheus_pacman_exporter/__init__.py
+++ b/prometheus_pacman_exporter/__init__.py
@@ -75,6 +75,20 @@ BASE_QUERIES: tuple[PackageQuery, ...] = (
     ),
 )
 
+PACMAN_UPDATEABLE_QUERY = PackageQuery(
+    (*PACMAN_BASE_COMMAND, "--upgrades"),
+    "updateable packages",
+    metrics.UPDATEABLE_PACKAGES,
+    empty_exit_codes=PACMAN_EMPTY_EXIT_CODES,
+)
+
+CHECKUPDATES_QUERY = PackageQuery(
+    ("checkupdates",),
+    "updateable packages",
+    metrics.UPDATEABLE_PACKAGES,
+    accepted_exit_codes=(0, 2),
+)
+
 
 def print_version(
     ctx: click.Context, param: click.Parameter | None, value: bool
@@ -150,8 +164,8 @@ def run_command(
     """
     command_string = shlex.join(command)
     debug("Running command:", command_string, err=True)
-    result = subprocess.run(command, capture_output=True, encoding="utf-8", check=False)
 
+    result = subprocess.run(command, capture_output=True, encoding="utf-8", check=False)
     if result.returncode in accepted_exit_codes:
         return result
 
@@ -266,26 +280,10 @@ def prometheus_pacman_exporter(
     debug("  verbose:", str(verbose_flag), err=True)
     debug("  quiet:", str(quiet_flag), err=True)
 
-    queries: list[PackageQuery] = [*BASE_QUERIES]
-
-    if use_checkupdates_flag:
-        queries.append(
-            PackageQuery(
-                ("checkupdates",),
-                "updateable packages",
-                metrics.UPDATEABLE_PACKAGES,
-                (0, 2),
-            )
-        )
-    else:
-        queries.append(
-            PackageQuery(
-                (*PACMAN_BASE_COMMAND, "--upgrades"),
-                "updateable packages",
-                metrics.UPDATEABLE_PACKAGES,
-                empty_exit_codes=PACMAN_EMPTY_EXIT_CODES,
-            )
-        )
+    queries: list[PackageQuery] = [
+        *BASE_QUERIES,
+        CHECKUPDATES_QUERY if use_checkupdates_flag else PACMAN_UPDATEABLE_QUERY,
+    ]
 
     if aur_flag:
         queries.append(