[feature][aur] enabled ccache during installation if available

CHANGELOG.md

@@ -12,7 +12,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Flatpak:
     - configuration file ( **flatpak.yml** ) will be created during the initialization ( on 0.8.1 it would only be created during the first app installation )
 - AUR:
-    - downgrading time reduced due to the fix described in ***Fixes***.
+    - downgrading time reduced due to the fix described in ***Fixes***
+    - the custom **makepkg.conf** generated at **~/.config/bauh/arch** will enable **ccache** if available on the system
 - Configuration ( **~/.config/bauh/config.yml** )
     - new property **hdpi** allowing to disable HDPI improvements
     ```

bauh/gems/arch/resources/img/arch.svg

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bauh/gems/arch/resources/img/mirror.svg

@@ -8,15 +8,15 @@
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bauh/gems/arch/worker.py

@@ -1,6 +1,7 @@
 import logging
 import os
 import re
+import time
 from multiprocessing import Process
 from pathlib import Path
 from threading import Thread
@@ -8,6 +9,7 @@ from threading import Thread
 import requests
 
 from bauh.api.abstract.context import ApplicationContext
+from bauh.commons.system import run_cmd
 from bauh.gems.arch import pacman, disk, CUSTOM_MAKEPKG_FILE, CONFIG_DIR, BUILD_DIR, \
     AUR_INDEX_FILE, config
 
@@ -17,7 +19,6 @@ URL_INFO = 'https://aur.archlinux.org/rpc/?v=5&type=info&arg={}'
 GLOBAL_MAKEPKG = '/etc/makepkg.conf'
 
 RE_MAKE_FLAGS = re.compile(r'#?\s*MAKEFLAGS\s*=\s*.+\s*')
-RE_COMPRESS_XZ = re.compile(r'#?\s*COMPRESSXZ\s*=\s*.+')
 RE_CLEAR_REPLACE = re.compile(r'[\-_.]')
 
 
@@ -74,8 +75,15 @@ class ArchCompilationOptimizer(Thread):
     def __init__(self, logger: logging.Logger):
         super(ArchCompilationOptimizer, self).__init__(daemon=True)
         self.logger = logger
+        self.re_compress_xz = re.compile(r'#?\s*COMPRESSXZ\s*=\s*.+')
+        self.re_build_env = re.compile(r'\s+BUILDENV\s*=.+')
+        self.re_ccache = re.compile(r'!?ccache')
+
+    def _is_ccache_installed(self) -> bool:
+        return bool(run_cmd('which ccache', print_error=False))
 
     def optimize(self):
+        ti = time.time()
         try:
             ncpus = os.cpu_count()
         except:
@@ -106,22 +114,50 @@ class ArchCompilationOptimizer(Thread):
                 else:
                     optimizations.append('MAKEFLAGS="-j$(nproc)"')
 
-            compress_xz = RE_COMPRESS_XZ.findall(custom_makepkg if custom_makepkg else global_makepkg)
+            compress_xz = self.re_compress_xz.findall(custom_makepkg or global_makepkg)
 
             if compress_xz:
                 not_eligible = [f for f in compress_xz if not f.startswith('#') and '--threads' in f]
 
                 if not not_eligible:
-                    custom_makepkg = RE_COMPRESS_XZ.sub('', global_makepkg)
+                    custom_makepkg = self.re_compress_xz.sub('', custom_makepkg or global_makepkg)
                     optimizations.append('COMPRESSXZ=(xz -c -z - --threads=0)')
                 else:
                     self.logger.warning("It seems '{}' COMPRESSXZ is already customized".format(GLOBAL_MAKEPKG))
             else:
                 optimizations.append('COMPRESSXZ=(xz -c -z - --threads=0)')
 
+            build_envs = self.re_build_env.findall(custom_makepkg or global_makepkg)
+
+            if build_envs:
+                build_def = None
+                for e in build_envs:
+                    env_line = e.strip()
+
+                    ccache_defs = self.re_ccache.findall(env_line)
+                    ccache_installed = self._is_ccache_installed()
+
+                    if ccache_defs:
+                        if ccache_installed:
+                            custom_makepkg = (custom_makepkg or global_makepkg).replace(e, '')
+
+                            if not build_def:
+                                build_def = self.re_ccache.sub('', env_line).replace('(', '(ccache ')
+                        elif not build_def:
+                            build_def = self.re_ccache.sub('', env_line)
+
+                if build_def:
+                    optimizations.append(build_def)
+            else:
+                self.logger.warning("No BUILDENV declaration found")
+
+                if self._is_ccache_installed():
+                    self.logger.info('Adding a BUILDENV declaration')
+                    optimizations.append('BUILDENV=(ccache)')
+
             if optimizations:
                 generated_by = '# <generated by bauh>\n'
-                custom_makepkg = generated_by + custom_makepkg + '\n' + generated_by + '\n'.join(optimizations) + '\n'
+                custom_makepkg = custom_makepkg + '\n' + generated_by + '\n'.join(optimizations) + '\n'
 
                 with open(CUSTOM_MAKEPKG_FILE, 'w+') as f:
                     f.write(custom_makepkg)
@@ -134,6 +170,8 @@ class ArchCompilationOptimizer(Thread):
                     self.logger.info("Removing old optimized 'makepkg.conf' at '{}'".format(CUSTOM_MAKEPKG_FILE))
                     os.remove(CUSTOM_MAKEPKG_FILE)
 
+            tf = time.time()
+            self.logger.info("Optimizations took {0:.2f} seconds".format(tf - ti))
             self.logger.info('Finished')
 
     def run(self):