Add `state_load_map_group()` to get `MapGroup` from config file

Currently untested. This function is supposed to get a mapping file from
the XDG config directory, parse it, and load it into the state.

3 files changed, 33 insertions, 0 deletions

diff --git a/dome_key_map.h b/dome_key_map.h
index fc2e7fd..3b5aa04 100644
--- a/dome_key_map.h
+++ b/dome_key_map.h
@@ -40,4 +40,6 @@ const CKeyActionResult *c_run_key_action(State *state, Trigger trigger, const Tr
 
 void state_free(State *ptr);
 
+void state_load_map_group(State *ptr);
+
 State *state_new(void);
diff --git a/src/cocoa_bridge.rs b/src/cocoa_bridge.rs
index 6e1a41b..b941f7f 100644
--- a/src/cocoa_bridge.rs
+++ b/src/cocoa_bridge.rs
@@ -1,4 +1,5 @@
 use std::ffi::{CStr, CString};
+use std::fs;
 use std::mem;
 use std::ptr;
 use std::slice;
@@ -7,6 +8,7 @@ use autopilot::key::type_string;
 // use cocoa::base::nil;
 // use cocoa::foundation::{NSArray, NSAutoreleasePool, NSDictionary};
 use libc::{c_char, size_t};
+use xdg;
 
 use {HeadphoneButton, MapGroup, MapKind};
 
@@ -96,6 +98,7 @@ pub struct CKeyActionResult {
 #[derive(Default)]
 pub struct State {
     in_mode: Option<Vec<HeadphoneButton>>,
+    map_group: Option<MapGroup>,
 }
 
 #[no_mangle]
@@ -110,6 +113,33 @@ pub extern "C" fn state_free(ptr: *mut State) {
 }
 
 #[no_mangle]
+pub extern "C" fn state_load_map_group(ptr: *mut State) {
+    let xdg_dirs = xdg::BaseDirectories::with_prefix("dome-key").unwrap();
+    let mapping_file = xdg_dirs.find_config_file("mappings.dkmap")
+        .expect(
+            &format!(
+                "No mapping file found at '{}{}'",
+                xdg_dirs.get_config_home()
+                    .to_str()
+                    .expect("Config home path contains invalid unicode"),
+                "/mappings.dkmap"
+            )
+        );
+
+    let state = unsafe {
+        assert!(!ptr.is_null());
+        &mut *ptr
+    };
+
+    let dkmap = fs::read_to_string(mapping_file)
+        .expect("Failed to read 'mappings.dkmap'");
+    state.map_group = Some(
+        MapGroup::parse(&dkmap)
+            .expect("Failed to parse 'mappings.dkmap'")
+    );
+}
+
+#[no_mangle]
 pub extern "C" fn c_run_key_action(
     state: *mut State,
     trigger: Trigger,
diff --git a/src/lib.rs b/src/lib.rs
index cac0f9b..16be4e0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,6 +4,7 @@ extern crate autopilot;
 #[macro_use]
 extern crate combine;
 extern crate libc;
+extern crate xdg;
 
 mod cocoa_bridge;
 mod parser;