Add if_found kwarg to subdir().

2 files changed, 20 insertions, 1 deletions

diff --git a/docs/markdown/Reference-manual.md b/docs/markdown/Reference-manual.md
index 3fac0ff..0f00203 100644
--- a/docs/markdown/Reference-manual.md
+++ b/docs/markdown/Reference-manual.md
@@ -1019,7 +1019,7 @@ has one argument the others don't have:
 ### subdir()
 
 ``` meson
-    void subdir(dir_name)
+    void subdir(dir_name, ...)
 ```
 
 Enters the specified subdirectory and executes the `meson.build` file
@@ -1032,6 +1032,12 @@ current build file and in all subsequent build files executed with
 Note that this means that each `meson.build` file in a source tree can
 and must only be executed once.
 
+This function has one keyword argument.
+
+ - `if_found` takes one or several dependency objects and will only
+   recurse in the subdir if they all return `true` when queried with
+   `.found()`
+
 ### subproject()
 
 ``` meson
diff --git a/docs/markdown/snippets/if-found.md b/docs/markdown/snippets/if-found.md
new file mode 100644
index 0000000..a8d4932
--- /dev/null
+++ b/docs/markdown/snippets/if-found.md
@@ -0,0 +1,13 @@
+# Added `if_found` to subdir
+
+Added a new keyword argument to the `subdir` command. It is given a
+list of dependency objects and the function will only recurse in the
+subdirectory if they are all found. Typical usage goes like this.
+
+    d1 = dependency('foo') # This is found
+    d2 = dependency('bar') # This is not found
+
+    subdir('somedir', if_found : [d1, d2])
+
+In this case the subdirectory would not be entered since `d2` could
+not be found.