+notcurses_align & modify ncplane_align #937

rust/src/nc.rs

@@ -38,9 +38,10 @@
 //
 // static inline functions to reimplement: 4
 // ----------------------------------------- (done / (x) wont / remaining)
-// (+) implement : 4 / 0 / 0
-// (#) unit tests: 0 / 0 / 4
+// (+) implement : 4 / 0 / 1
+// (#) unit tests: 0 / 0 / 5
 // -----------------------------------------
+//+notcurses_align
 //+notcurses_getc_blocking
 //+notcurses_getc_nblock
 //+notcurses_stddim_yx
@@ -49,7 +50,23 @@
 use core::ptr::null;
 
 use crate as nc;
-use nc::{ncinput, ncplane, notcurses};
+use nc::types::{Align, Input, FullMode, Plane, ALIGN_CENTER, ALIGN_LEFT};
+
+/// return the offset into 'availcols' at which 'cols' ought be output given the requirements of 'align'
+// TODO: TEST
+#[inline]
+pub fn notcurses_align(availcols: i32, align: Align, cols: i32) -> i32 {
+    if align == ALIGN_LEFT {
+        return 0;
+    }
+    if cols > availcols {
+        return 0;
+    }
+    if align == ALIGN_CENTER {
+        return (availcols - cols) / 2;
+    }
+    availcols - cols // ALIGN_RIGHT
+}
 
 /// 'input' may be NULL if the caller is uninterested in event details.
 /// If no event is ready, returns 0.

rust/src/plane.rs

@@ -144,7 +144,7 @@ use cstr_core::CString;
 use crate as nc;
 use nc::types::{
     Align, AlphaBits, Cell, Channel, ChannelPair, Color, EGCBackstop, IntResult, Plane, StyleMask,
-    ALIGN_CENTER, ALIGN_LEFT, ALIGN_RIGHT, EGC,
+    EGC,
 };
 
 /// Return the column at which 'cols' columns ought start in order to be aligned
@@ -155,21 +155,7 @@ use nc::types::{
 // TODO: TEST
 #[inline]
 pub fn ncplane_align(plane: &Plane, align: Align, cols: i32) -> i32 {
-    if align == ALIGN_LEFT {
-        return 0;
-    }
-
-    let plane_cols = ncplane_dim_x(plane);
-    if cols > plane_cols {
-        return 0;
-    }
-
-    if align == ALIGN_CENTER {
-        return plane_cols - cols / 2;
-    } else if align == ALIGN_RIGHT {
-        return plane_cols - cols;
-    }
-    core::i32::MAX
+    nc::notcurses_align(nc::ncplane_dim_x(plane), align, cols)
 }
 
 /// Retrieve the current contents of the cell under the cursor into 'cell'.