X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=stdlib%2Fprelude.gl;h=f4ab20ee08f2615f78cf7c392727179bc99f448b;hb=d513d8b6aa8c70191deb3e1a8392819c9181a8f9;hp=7e6cbd532f8ac89e836c21224a60f851ae080a2c;hpb=50da8152f0cfceeea7c92d55c8bc2f75cecd98ef;p=goals.git

diff --git a/stdlib/prelude.gl b/stdlib/prelude.gl
index 7e6cbd5..f4ab20e 100644
--- a/stdlib/prelude.gl
+++ b/stdlib/prelude.gl
@@ -21,7 +21,7 @@
 # tactics.
 
 # The only tactic that ‘make’ has.
-tactic *file (filename) = {
+tactic *file (filename) = @{
     # Rebuild if the target file doesn't exist at all.
     test -f %filename || exit 99
 
@@ -33,7 +33,7 @@ tactic *file (filename) = {
 
 # This is a simpler tactic than the above since it will
 # rebuild if the file is missing, but not if it is older.
-tactic *exists (filename) = {
+tactic *exists (filename) = @{
     test -f %filename || exit 99
 }
 
@@ -41,7 +41,7 @@ tactic *exists (filename) = {
 # Text functions.
 
 # Sort + uniq a list.
-function sort (xs) = {
+pure function sort (xs) returning strings = @{
     for f in %xs; do echo "$f"; done | sort -u
 }
 
@@ -49,12 +49,15 @@ function sort (xs) = {
 # File functions.
 
 # Expand a wildcard into a list of filenames.
-function wildcard (wc) = {
+#
+# This function is probably not "pure" since it depends on the
+# current working directory and also files may be created in
+# the directory while goals is running which would affect the
+# result.
+function wildcard (wc) returning strings = @{
     shopt -s nullglob
     # Note that the substitution is quoted by goals, so to expand
     # it we must assign it to a variable and then use it unquoted.
     wc=%wc
-    for f in $wc; do
-        echo "$f"
-    done
+    for f in $wc; do echo "$f"; done
 }