From 5bed6bb3ce3ea13adead455cbc7b0fc94818860b Mon Sep 17 00:00:00 2001
From: merakor <cem@ckyln.com>
Date: Sun, 3 Jan 2021 22:22:43 +0000
Subject: pkg_gentree(): add function to generate a dependency graph

FossilOrigin-Name: e56971ac89f4a4e1c3efd62dad13b3a1c43bc6266c2803600995954cb61ee6cd
---
 src/cpt-lib.in | 44 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

diff --git a/src/cpt-lib.in b/src/cpt-lib.in
index b42d0e3..770e38d 100644
--- a/src/cpt-lib.in
+++ b/src/cpt-lib.in
@@ -773,16 +773,29 @@ pkg_depends() {
             (pkg_list "$1" >/dev/null) && return
 
         while read -r dep type || [ "$dep" ]; do
+            # Skip comments and empty lines.
+            [ "${dep##\#*}" ] || continue
             # Skip test dependencies unless $CPT_TEST is set to 1.
-            case $type in test) [ "$CPT_TEST" = 1 ] || continue; esac
+            #
+            # Skip make dependencies on the 'tree' operation for child packages
+            # or when the 'first-nomake' argument is given.
+            case $type in
+                test) [ "$CPT_TEST" = 1 ] || continue ;;
+                make) [ "$2" = tree ] && [ -z "${3#first-nomake}" ] && continue
+            esac
 
-            # Recurse through the dependencies of the child packages.
-            [ "${dep##\#*}" ] && pkg_depends "$dep"
+            # Recurse through the dependencies of the child packages. Forward
+            # the 'tree' operation.
+            if [ "$2" = tree ]; then
+                pkg_depends "$dep" tree
+            else
+                pkg_depends "$dep"
+            fi
         done 2>/dev/null < "$(pkg_find "$1")/depends" ||:
 
         # After child dependencies are added to the list,
         # add the package which depends on them.
-        [ "$2" = explicit ] || deps="$deps $1 "
+        [ "$2" = explicit ] || [ "$3" ] || deps="$deps $1 "
     }
 }
 
@@ -1822,6 +1835,29 @@ pkg_get_base() (
     if [ "$nonl" ]; then printf '%s ' "$@"; else printf '%s\n' "$@"; fi
 )
 
+pkg_gentree() (
+    # Generate an ordered dependency tree of a package. Useful for testing
+    # whether the generated dependency tree is enough to actually building a
+    # given package. A second argument can be given as a combination of
+    # characters (similar to 'tar(1)' keys) which will be used as an option
+    # parser. See the documentation for more information on the keys.
+    deps='' reverse='' nonl='' make_deps=first
+    for op in $(sepchar "$2"); do
+        case "$op" in
+            b) deps="$(pkg_get_base nonl)" ;;
+            x) make_deps=first-nomake ;;
+            r) reverse=1 ;;
+            n) nonl=1 ;;
+            *) return 1
+        esac
+    done
+    pkg_depends "$1" tree "${make_deps:+first}"
+    eval set -- "$deps"
+    pkg_order "$@"
+    if [ "$reverse" ]; then eval set -- "$redro"; else eval set -- "$order"; fi
+    if [ "$nonl" ];    then printf '%s ' "$@"; else printf '%s\n' "$@"; fi
+)
+
 pkg_clean() {
     # Clean up on exit or error. This removes everything related
     # to the build.
-- 
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