[Buildroot] [next 1/2] package/pkg-download: add pypi helper for downloading packages from pypi.org

[Marcus Hoffmann via buildroot <buildroot@buildroot.org>]

Pypi provides packages under a stable url (instead of the hash based one
that changes every version) but we don't currently make use of that a lot.

Introduce a pypi helper function analougous to the github and gitlab
helpers to make it easier to download packages from pypi using this url
scheme.

For that we introduce a firstchar function (written by Peter) which
returns the first character in a string without spawning a shell.

Co-developed-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Marcus Hoffmann <buildroot@bubu1.eu>
---
 package/pkg-download.mk | 3 +++
 support/misc/utils.mk   | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/package/pkg-download.mk b/package/pkg-download.mk
index ce63ce9658..160c512599 100644
--- a/package/pkg-download.mk
+++ b/package/pkg-download.mk
@@ -56,6 +56,9 @@ github = https://github.com/$(1)/$(2)/archive/$(3)
 # gitlab(user,package,version): returns site of Gitlab-generated tarball
 gitlab = https://gitlab.com/$(1)/$(2)/-/archive/$(3)
 
+# pypi(package): returns site of pypi.org hosted packge
+pypi = https://files.pythonhosted.org/packages/source/$(call firstchar,$(1))/$(1)
+
 # Expressly do not check hashes for those files
 BR_NO_CHECK_HASH_FOR =
 
diff --git a/support/misc/utils.mk b/support/misc/utils.mk
index 5275006d6d..3caf06274f 100644
--- a/support/misc/utils.mk
+++ b/support/misc/utils.mk
@@ -62,6 +62,9 @@ endef
 $(eval $(call caseconvert-helper,UPPERCASE,$(join $(addsuffix :,$([FROM])),$([TO]))))
 $(eval $(call caseconvert-helper,LOWERCASE,$(join $(addsuffix :,$([TO])),$([FROM]))))
 
+# extracts the first character of a string
+firstchar = $(if $(1),$(strip $(foreach c,$([FROM]) / $([TO]),$(if $(patsubst $(c)%,,$(1)),,$(c)))))
+
 # Reverse the orders of words in a list. Again, inspired by the gmsl
 # 'reverse' macro.
 reverse = $(if $(1),$(call reverse,$(wordlist 2,$(words $(1)),$(1))) $(firstword $(1)))
-- 
2.54.0

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