make font weight configurable

People using themes for their terminal emulators that do a lot of
voodoo, could experience sign color problems because of the font being
bold by default.

Thus a new variable was introduced: g:signify_sign_weight.

Fixes #24.

README.md

@@ -204,6 +204,8 @@ let g:signify_update_on_bufenter = 1
 
 let g:signify_line_highlight = 1
 
+let g:signify_sign_weight = 'bold'
+
 let g:signify_sign_add               = '+'
 let g:signify_sign_delete            = '-'
 let g:signify_sign_change            = '*'

doc/signify.txt

@@ -163,6 +163,17 @@ delays.
 
 Enable line highlighting in addation to using signs.
 
+============-
+
+    let g:signify_sign_weight = 'bold'
+
+Possible values: 'bold' (default), 'none'
+
+Use either bold or normal font weight.
+
+NOTE: If you experience colors not getting set properly, try changing this
+variable to 'none'.
+
 ============-
 
     let g:signify_sign_add               = '+'
@@ -283,15 +294,17 @@ Thank you for flying mhi airlines. Get the Vim on!
 People who contributed to sy. Format: Person (Github account)
 
 
-Jeremy Mack       (mutewinter)
+Jeremy Mack            (mutewinter)
-Chong Li          (chongli)
+Chong Li               (chongli)
-Robin Munn        (rmunn)
+Robin Munn             (rmunn)
-Martin Hoch       (rtwo)
+Martin Hoch            (rtwo)
-fritzophrenic     (Ben Fritz)
+fritzophrenic          (Ben Fritz)
-Morgan Fouesneau  (mfouesneau)
+Morgan Fouesneau       (mfouesneau)
-Zhao Cai          (zhaocai)
+Zhao Cai               (zhaocai)
-Otto Modinos      (otommod)
+Otto Modinos           (otommod)
-Ryan Kois         (kid-icarus)
+Ryan Kois              (kid-icarus)
+Jon Kinney             (j2fly)
+Israel Chauca Fuentes  (Raimondi)
 
 
 ==============================================================================

plugin/signify.vim

@@ -372,6 +372,8 @@ endfunction
 
 " Function: s:colors_set {{{1
 function! s:colors_set() abort
+  let weight = get(g:, 'signify_sign_weight', 'bold')
+
   if has('gui_running')
     if exists('g:signify_sign_color_guibg')
       let guibg = g:signify_sign_color_guibg
@@ -386,9 +388,9 @@ function! s:colors_set() abort
     else
       let guifg_add = get(g:, 'signify_sign_color_guifg_add', '#11ee11')
       if empty(guibg) || guibg < 0
-        execute 'hi SignifyAdd gui=bold guifg='. guifg_add
+        execute 'hi SignifyAdd gui='. weight .' guifg='. guifg_add
       else
-        execute 'hi SignifyAdd gui=bold guifg='. guifg_add .' guibg='. guibg
+        execute 'hi SignifyAdd gui='. weight .' guifg='. guifg_add .' guibg='. guibg
       endif
     endif
 
@@ -397,9 +399,9 @@ function! s:colors_set() abort
     else
       let guifg_delete = get(g:, 'signify_sign_color_guifg_delete', '#ee1111')
       if empty(guibg) || guibg < 0
-        execute 'hi SignifyDelete gui=bold guifg='. guifg_delete
+        execute 'hi SignifyDelete gui='. weight .' guifg='. guifg_delete
       else
-        execute 'hi SignifyDelete gui=bold guifg='. guifg_delete .' guibg='. guibg
+        execute 'hi SignifyDelete gui='. weight .' guifg='. guifg_delete .' guibg='. guibg
       endif
     endif
 
@@ -408,9 +410,9 @@ function! s:colors_set() abort
     else
       let guifg_change = get(g:, 'signify_sign_color_guifg_change', '#eeee11')
       if empty(guibg) || guibg < 0
-        execute 'hi SignifyChange gui=bold guifg='. guifg_change
+        execute 'hi SignifyChange gui='. weight .' guifg='. guifg_change
       else
-        execute 'hi SignifyChange gui=bold guifg='. guifg_change .' guibg='. guibg
+        execute 'hi SignifyChange gui='. weight .' guifg='. guifg_change .' guibg='. guibg
       endif
     endif
   else
@@ -427,9 +429,9 @@ function! s:colors_set() abort
     else
       let ctermfg_add = get(g:, 'signify_sign_color_ctermfg_add', 2)
       if empty(ctermbg) || ctermbg < 0
-        execute 'hi SignifyAdd cterm=bold ctermfg='. ctermfg_add
+        execute 'hi SignifyAdd cterm='. weight .' ctermfg='. ctermfg_add
       else
-        execute 'hi SignifyAdd cterm=bold ctermfg='. ctermfg_add .' ctermbg='. ctermbg
+        execute 'hi SignifyAdd cterm='. weight .' ctermfg='. ctermfg_add .' ctermbg='. ctermbg
       endif
     endif
 
@@ -438,9 +440,9 @@ function! s:colors_set() abort
     else
       let ctermfg_delete = get(g:, 'signify_sign_color_ctermfg_delete', 1)
       if empty(ctermbg) || ctermbg < 0
-        execute 'hi SignifyDelete cterm=bold ctermfg='. ctermfg_delete
+        execute 'hi SignifyDelete cterm='. weight .' ctermfg='. ctermfg_delete
       else
-        execute 'hi SignifyDelete cterm=bold ctermfg='. ctermfg_delete .' ctermbg='. ctermbg
+        execute 'hi SignifyDelete cterm='. weight .' ctermfg='. ctermfg_delete .' ctermbg='. ctermbg
       endif
     endif
 
@@ -449,9 +451,9 @@ function! s:colors_set() abort
     else
       let ctermfg_change = get(g:, 'signify_sign_color_ctermfg_change', 3)
       if empty(ctermbg) || ctermbg < 0
-        execute 'hi SignifyChange cterm=bold ctermfg='. ctermfg_change
+        execute 'hi SignifyChange cterm='. weight .' ctermfg='. ctermfg_change
       else
-        execute 'hi SignifyChange cterm=bold ctermfg='. ctermfg_change .' ctermbg='. ctermbg
+        execute 'hi SignifyChange cterm='. weight .' ctermfg='. ctermfg_change .' ctermbg='. ctermbg
       endif
     endif
   endif