basic support for hiding based on win size per part (#200).

autoload/airline/parts.vim

@@ -22,6 +22,10 @@ function! airline#parts#define_raw(key, raw)
   call airline#parts#define(a:key, { 'raw': a:raw })
 endfunction
 
+function! airline#parts#define_minwidth(key, width)
+  call airline#parts#define(a:key, { 'minwidth': a:width })
+endfunction
+
 function! airline#parts#define_empty(keys)
   for key in a:keys
     call airline#parts#define_raw(key, '')

autoload/airline/section.vim

@@ -19,12 +19,14 @@ function! s:get_val(key, append)
     return a:key
   endif
 
+  let minwidth = get(part, 'minwidth', 0)
+
   if a:append > 0
-    let val .= '%{airline#util#append('.func.')}'
+    let val .= printf('%%{airline#util#append(%s,%s)}', func, minwidth)
   elseif a:append < 0
-    let val .= '%{airline#util#prepend('.func.')}'
+    let val .= printf('%%{airline#util#prepend(%s,%s)}', func, minwidth)
   else
-    let val .= '%{'.func.'}'
+    let val .= printf('%%{airline#util#wrap(%s,%s)}', func, minwidth)
   endif
   return val
 endfunction

autoload/airline/util.vim

@@ -1,11 +1,24 @@
 " MIT License. Copyright (c) 2013 Bailey Ling.
 " vim: et ts=2 sts=2 sw=2
 
-function! airline#util#append(text)
+function! airline#util#wrap(text, minwidth)
+  if a:minwidth > 0 && winwidth(0) < a:minwidth
+    return ''
+  endif
+  return a:text
+endfunction
+
+function! airline#util#append(text, minwidth)
+  if a:minwidth > 0 && winwidth(0) < a:minwidth
+    return ''
+  endif
   return empty(a:text) ? '' : '  '.g:airline_left_alt_sep.' '.a:text
 endfunction
 
-function! airline#util#prepend(text)
+function! airline#util#prepend(text, minwidth)
+  if a:minwidth > 0 && winwidth(0) < a:minwidth
+    return ''
+  endif
   return empty(a:text) ? '' : a:text.' '.g:airline_right_alt_sep.' '
 endfunction
 

t/parts.vim

@@ -20,5 +20,10 @@ describe 'parts'
     call airline#parts#define_raw('raw', 'bar')
     Expect airline#parts#get('raw').raw == 'bar'
   end
+
+  it 'can define a minwidth'
+    call airline#parts#define_minwidth('mw', 123)
+    Expect airline#parts#get('mw').minwidth == 123
+  end
 end
 

t/section.vim

@@ -16,17 +16,17 @@ describe 'section'
 
   it 'should create sections with no separators'
     let s = airline#section#create(['text', 'raw', 'func'])
-    Expect s == '%{"text"}raw%{SectionSpec()}'
+    Expect s == '%{airline#util#wrap("text",0)}raw%{airline#util#wrap(SectionSpec(),0)}'
   end
 
   it 'should create left sections with separators'
     let s = airline#section#create_left(['text', 'text'])
-    Expect s == '%{"text"}%{airline#util#append("text")}'
+    Expect s == '%{airline#util#wrap("text",0)}%{airline#util#append("text",0)}'
   end
 
   it 'should create right sections with separators'
     let s = airline#section#create_right(['text', 'text'])
-    Expect s == '%{airline#util#prepend("text")}%{"text"}'
+    Expect s == '%{airline#util#prepend("text",0)}%{airline#util#wrap("text",0)}'
   end
 
   it 'should prefix with highlight group if provided'

t/util.vim

@@ -16,13 +16,13 @@ describe 'util'
   end
 
   it 'has append wrapper function'
-    Expect airline#util#append('') == ''
-    Expect airline#util#append('1') == '  > 1'
+    Expect airline#util#append('', 0) == ''
+    Expect airline#util#append('1', 0) == '  > 1'
   end
 
   it 'has prepend wrapper function'
-    Expect airline#util#prepend('') == ''
-    Expect airline#util#prepend('1') == '1 < '
+    Expect airline#util#prepend('', 0) == ''
+    Expect airline#util#prepend('1', 0) == '1 < '
   end
 
   it 'has getwinvar function'
@@ -38,5 +38,17 @@ describe 'util'
     call airline#util#exec_funcrefs([function('Util3')], 1, 2, 3, 4)
     Expect g:count == 4
   end
+
+  it 'should ignore minwidth if less than 0'
+    Expect airline#util#append('foo', -1) == '  > foo'
+    Expect airline#util#prepend('foo', -1) == 'foo < '
+    Expect airline#util#wrap('foo', -1) == 'foo'
+  end
+
+  it 'should return empty if winwidth() > minwidth'
+    Expect airline#util#append('foo', 99999) == ''
+    Expect airline#util#prepend('foo', 99999) == ''
+    Expect airline#util#wrap('foo', 99999) == ''
+  end
 end