Fetch project list in zsh completition at runtime

Similar to the bash/tcsh completition fetch the project list at
runtime.
Includes basic completion for alias/api-url as project list
cache is separated per instance.

Signed-off-by: Björn Bidar <bjorn.bidar@jolla.com>

contrib/osc.zsh

@@ -1,6 +1,7 @@
 #compdef osc
 #
 # Copyright (C) 2009,2010 Holger Macht <holger@homac.de>
+# Copyright (C) 2023      Björn Bidar  <bjorn.bidar@jolla.com>
 #
 # This file is released under the GPLv2.
 #
@@ -17,16 +18,25 @@
 #
 
 OSC_BUILD_TARGETS="openSUSE_13.1 openSUSE_13.2 openSUSE_Tumbleweed openSUSE_Factory SLE_11_SP3 SLE_12"
-OSC_PROJECTS="openSUSE:Factory openSUSE:Tumbleweed openSUSE:13.2 openSUSE:13.1"
 
 # user defined variables $OSC_BUILD_TARGETS_EXTRA and
 # $OSC_PROJECTS_EXTRA can add to the project/build target list
 OSC_BUILD_TARGETS="$OSC_BUILD_TARGETS $ZSH_OSC_BUILD_TARGETS_EXTRA"
-OSC_PROJECTS="$OSC_PROJECTS $ZSH_OSC_PROJECTS_EXTRA"
 
 # Main dispatcher
 
 _osc() {
+    # Variables shared by all internal functions
+    local osc_projects osc_rc osc_cmd osc_alias
+    _osc_complete_prepare
+    osc_projects="${XDG_CACHE_HOME}/osc.projects"
+    osc_rc="${XDG_CONFIG_HOME}/osc/oscrc"
+    osc_cmd=osc
+
+    if [[ "${words[0]}" = "isc" ]] ; then
+        osc_alias=internal
+    fi
+
     if (( CURRENT > 2 )) && [[ ${words[2]} != "help" ]]; then
         # Remember the subcommand name
 	local cmd=${words[2]}
@@ -36,6 +46,40 @@ _osc() {
 	(( CURRENT-- ))
 	shift words
         # Run the completion for the subcommand
+    if [ $cmd = -A -o $cmd = --apiurl ] ; then
+        if [[ -s "${osc_rc}" ]] ; then
+            local hints=($(sed -rn '/^(aliases=|\[http)/{s/,/ /g;s/(aliases=|\[|\])//gp}' < "${osc_rc}" 2> /dev/null))
+            if [[ -n "${words[2]}" ]]; then
+	            for h in ${hints[@]} ; do
+	                case "$h" in
+	                    http*)
+		                    local tmp=$(sed -rn '\@^\['${h}'@,\@=@{\@^aliases=@{s@[^=]+=([^,]+),.*@\1@p};}' < "${osc_rc}" 2> /dev/null)
+		                    if [[ "${words[2]}" = "$h" ]]; then
+		                        osc_alias=$tmp
+		                        break
+		                    fi
+		                    ;;
+	                    *)
+		                    if [[ "${words[2]}" = "$h" ]]; then
+		                        osc_alias=$h
+		                        break
+		                    fi
+	                esac
+	            done
+            else
+                _arguments '1:ALIAS:( `echo $hints`)'
+                return
+            fi
+        fi
+    fi
+
+    if [[ -n "$osc_alias" ]] ; then
+        osc_projects="${osc_projects}.${osc_alias}"
+        osc_command="$osc_command -A $osc_alias"
+    fi
+
+    _osc_update_project_list
+
 	if [ "$cmd" = "submitreq" -o "$cmd" = "sr" ]; then
 	    _osc_cmd_submitreq
 	elif [ "$cmd" = "getbinaries" ]; then
@@ -68,9 +112,45 @@ _osc() {
     fi
 }
 
+_osc_call_me_maybe()
+{
+    typeset -i ctime=$(command date -d "$(command stat -c '%z' ${1})" +'%s')
+    typeset -i   now=$(command date -d now +'%s')
+    if ((now - ctime < 86400)) ; then
+        return 1
+    fi
+    return 0
+}
+
+_osc_complete_prepare() {
+    local xdg_dir
+    for xdg_dir in "${XDG_CACHE_HOME:=$HOME/.cache}" "${XDG_CONFIG_HOME:=$HOME/.config}"; do
+        if [[ ! -d "${xdg_dir}" ]]; then
+            mkdir -p "${xdg_dir}"
+        fi
+    done
+
+    if [[ -f ~/.osc.projects ]]; then
+        rm ~/.osc.projects -f
+    fi
+}
+
+_osc_update_project_list() {
+    if [[ -s "${osc_projects}" ]] ; then
+        if _osc_call_me_maybe "$osc_projects" ; then
+            if tmp=$(mktemp ${osc_projects}.XXXXXX) ; then
+                command ${osc_cmd} ls / >| $tmp
+	            mv -uf $tmp ${osc_projects}
+	        fi
+        fi
+    else
+        command ${osc_cmd} ls / >| "${osc_projects}"
+    fi
+}
+
 _osc_cmd_getbinaries() {
     _arguments \
-	'1:PROJECT:( `echo $OSC_PROJECTS` )' \
+	'1:PROJECT:( `cat $osc_projects` )' \
 	'2:PACKAGE:(PACKAGE)' \
 	'3:REPOSITORY:( `echo $OSC_BUILD_TARGETS` )' \
 	'4:ARCHITECTURE:(i586 x86_64)'
@@ -78,7 +158,7 @@ _osc_cmd_getbinaries() {
 
 _osc_cmd_checkout() {
     _arguments \
-	'1:PROJECT:( `echo $OSC_PROJECTS` )' \
+	'1:PROJECT:( `cat $osc_projects` )' \
 	'2:PACKAGE:(PACKAGE)'
 }