[arch] improvement -> upgrade summary: displaying the reason a given package must be installed

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [0.9.7] 2020
+### Improvements
+- Arch
+    - upgrade summary: displaying the reason a given package must be installed
+     <p align="center">
+        <img src="https://raw.githubusercontent.com/vinifmor/bauh/staging/pictures/releases/0.9.7/arch_install_reason.png">
+     </p>
+
 ### Fixes
 - Arch
     - not able to upgrade a package that explicitly defines a conflict with itself (e.g: grub)

bauh/gems/arch/updates.py

@@ -334,7 +334,7 @@ class UpdatesSummarizer:
                 context.aur_index.update(names)
                 self.logger.info("AUR index loaded on the context")
 
-    def _map_requirement(self, pkg: ArchPackage, context: UpdateRequirementsContext, installed_sizes: Dict[str, int] = None) -> UpgradeRequirement:
+    def _map_requirement(self, pkg: ArchPackage, context: UpdateRequirementsContext, installed_sizes: Dict[str, int] = None, to_install: bool = False, to_upgrade: Set[str] = None) -> UpgradeRequirement:
         requirement = UpgradeRequirement(pkg)
 
         if pkg.repository != 'aur':
@@ -347,6 +347,11 @@ class UpdatesSummarizer:
             if current_size is not None and data['s']:
                 requirement.extra_size = data['s'] - current_size
 
+            if to_install and context.pkgs_data and context.to_update:
+                names = context.pkgs_data[pkg.name].get('p', {pkg.name})
+                required_by = ','.join([p for p in to_upgrade if p != pkg.name and context.pkgs_data[p]['d'] and any([n for n in names if n in context.pkgs_data[p]['d']])])
+                requirement.reason = '{}: {}'.format(self.i18n['arch.info.required by'].capitalize(), required_by if required_by else '?')
+
         return requirement
 
     def summarize(self, pkgs: List[ArchPackage], root_password: str, arch_config: dict) -> UpgradeRequirements:
@@ -422,6 +427,7 @@ class UpdatesSummarizer:
             res.cannot_upgrade = [d for d in context.cannot_upgrade.values()]
 
         if context.to_install:
-            res.to_install = [self._map_requirement(p, context) for p in context.to_install.values()]
+            to_upgrade = {r.pkg.name for r in res.to_upgrade} if res.to_upgrade else None
+            res.to_install = [self._map_requirement(p, context, to_install=True, to_upgrade=to_upgrade) for p in context.to_install.values()]
 
         return res

bauh/view/qt/thread.py

@@ -236,7 +236,7 @@ class UpgradeSelected(AsyncAction):
         return FormComponent(label=self.i18n['action.update.cannot_update_label'], components=comps)
 
     def _gen_to_install_form(self, reqs: List[UpgradeRequirement]) -> Tuple[FormComponent, Tuple[int, int]]:
-        opts = [self._req_as_option(r) for r in reqs]
+        opts = [self._req_as_option(r, custom_tooltip=r.reason) for r in reqs]
         comps = [MultipleSelectComponent(label='', options=opts, default_options=set(opts))]
         required_size, extra_size = self._sum_pkgs_size(reqs)