moved command existance check to separate function

setup.py

@@ -15,6 +15,15 @@ import sys
 # must be synced with `src/constants.py`
 tmp_dir = "/tmp/com.developomp.setup"
 
+#
+# Util
+#
+
+
+def command_exits(command: str) -> bool:
+    return system(f"command -v {command} &> /dev/null") == 0
+
+
 #
 # Common
 #
@@ -53,7 +62,7 @@ def exit_if_system_not_compatible():
     """Exits script if the OS is not linux or if pacman does not exist"""
 
     print("Checking if system is compatible")
-    if "linux" not in sys.platform.lower() or system("command -v pacman &> /dev/null"):
+    if "linux" not in sys.platform.lower() or not command_exits("pacman"):
         print("This script should only be used on arch linux.", file=sys.stderr)
         exit(1)
 
@@ -77,7 +86,7 @@ def install_git():
     """Installs git if it's not installed already"""
 
     print("Initializing git")
-    if system("command -v git &> /dev/null"):
+    if not command_exits("git"):
         print("git was not installed already. Installing now.")
         system("sudo pacman -S --noconfirm --needed git")
 

src/constants.py

@@ -2,9 +2,6 @@
 # this variable may be altered by the script
 # most notably by `src/interface/choose_action.py`
 
-from os import system
-
 content_dir = "/tmp/com.developomp.setup"
 tmp_dir = content_dir
 home_dir = "/home/pomp"
-is_zsh_available: bool = system("command -v zsh &> /dev/null") == 0

src/setup/dev/node.py

@@ -1,8 +1,8 @@
 from os import system
 from os.path import isdir
 
-from src.constants import home_dir, is_zsh_available
-from src.util import paru_install, zsh_system
+from src.constants import home_dir
+from src.util import paru_install, zsh_system, command_exists
 from src.setup.system import zsh
 from src import log
 
@@ -21,7 +21,7 @@ def setup():
     """
 
     # Install zsh if it's not installed already
-    if not is_zsh_available:
+    if not command_exists("zsh"):
         zsh.setup()
 
     paru_install("nvm")

src/util.py

@@ -114,6 +114,10 @@ def zsh_system(command: str):
     system(f"/usr/bin/zsh -c '{command}'")
 
 
+def command_exists(command: str) -> bool:
+    return system(f"command -v {command} &> /dev/null") == 0
+
+
 """
 def setup_essentials():
     setup_fstab