Improve file head support (#3034)

autoload/SpaceVim/api/vim.vim

@@ -46,6 +46,29 @@ function! s:self.jumps() abort
   return result
 endfunction
 
+function! s:self.parse_string(line) abort
+  let expr = '`[^`]*`'
+  let i = 0
+  let line = []
+  while i < strlen(a:line) || i != -1
+    let [rst, m, n] = matchstrpos(a:line, expr, i)
+    if m == -1
+      call add(line, a:line[i:-1])
+      break
+    else
+      call add(line, a:line[i:m-1])
+      try
+        let rst = eval(rst[1:-2])
+      catch
+        let rst = ''
+      endtry
+      call add(line, rst)
+    endif
+    let i = n
+  endwhile
+  return join(line, '')
+endfunction
+
 function! SpaceVim#api#vim#get() abort
   return deepcopy(s:self)
 endfunction

autoload/SpaceVim/layers/edit.vim

@@ -11,6 +11,7 @@ scriptencoding utf-8
 let s:PASSWORD = SpaceVim#api#import('password')
 let s:NUMBER = SpaceVim#api#import('data#number')
 let s:LIST = SpaceVim#api#import('data#list')
+let s:VIM = SpaceVim#api#import('vim')
 
 function! SpaceVim#layers#edit#plugins() abort
   let plugins = [
@@ -422,35 +423,35 @@ function! s:delete_extra_space() abort
 endfunction
 
 function! s:set_justification_to(align) abort
-    let l:startlinenr = line("'{")
-    let l:endlinenr = line("'}")
-    if getline(l:startlinenr) ==# ''
-        let l:startlinenr += 1
+  let l:startlinenr = line("'{")
+  let l:endlinenr = line("'}")
+  if getline(l:startlinenr) ==# ''
+    let l:startlinenr += 1
+  endif
+  if getline(l:endlinenr) ==# ''
+    let l:endlinenr -= 1
+  endif
+  let l:lineList = map(getline(l:startlinenr, l:endlinenr), 'trim(v:val)')
+  let l:maxlength = 0
+  for l:line in l:lineList
+    let l:length = strdisplaywidth(l:line)
+    if l:length > l:maxlength
+      let l:maxlength = l:length
     endif
-    if getline(l:endlinenr) ==# ''
-        let l:endlinenr -= 1
-    endif
-    let l:lineList = map(getline(l:startlinenr, l:endlinenr), 'trim(v:val)')
-    let l:maxlength = 0
-    for l:line in l:lineList
-        let l:length = strdisplaywidth(l:line)
-        if l:length > l:maxlength
-            let l:maxlength = l:length
-        endif
-    endfor
+  endfor
 
-    if a:align ==# 'left'
-        execute l:startlinenr . ',' . l:endlinenr . ":left\<cr>"
-    elseif a:align ==# 'center'
-        execute l:startlinenr . ',' . l:endlinenr . ':center ' . l:maxlength . "\<cr>"
-    elseif a:align ==# 'right'
-        execute l:startlinenr . ',' . l:endlinenr . ':right  ' . l:maxlength . "\<cr>"
-    endif
+  if a:align ==# 'left'
+    execute l:startlinenr . ',' . l:endlinenr . ":left\<cr>"
+  elseif a:align ==# 'center'
+    execute l:startlinenr . ',' . l:endlinenr . ':center ' . l:maxlength . "\<cr>"
+  elseif a:align ==# 'right'
+    execute l:startlinenr . ',' . l:endlinenr . ':right  ' . l:maxlength . "\<cr>"
+  endif
 
-    unlet l:startlinenr
-    unlet l:endlinenr
-    unlet l:lineList
-    unlet l:maxlength
+  unlet l:startlinenr
+  unlet l:endlinenr
+  unlet l:lineList
+  unlet l:maxlength
 endfunction
 
 let s:local_lorem_ipsum = [
@@ -614,11 +615,15 @@ let s:ft_head_tp = {}
 function! s:add_buffer_head() abort
   if has_key(s:ft_head_tp, &ft) && getline(1) == '' && line('$')  == 1
     let head = s:ft_head_tp[&ft]
-    call setline(1, head)
+    call setline(1, map(head, 's:parse(v:val)'))
     call cursor(len(head), 0)
   endif
 endfunction
 
+function! s:parse(line) abort
+  return s:VIM.parse_string(a:line)
+endfunction
+
 function! SpaceVim#layers#edit#add_ft_head_tamplate(ft, tamp) abort
   call extend(s:ft_head_tp, {a:ft : a:tamp})
 endfunction

autoload/SpaceVim/layers/lang/sh.vim

@@ -23,12 +23,7 @@ function! SpaceVim#layers#lang#sh#config() abort
   let g:zsh_fold_enable = 1
   " }}}
 
-  call SpaceVim#layers#edit#add_ft_head_tamplate('sh',
-        \ ['#!/usr/bin/env bash',
-        \ '',
-        \ ''
-        \ ]
-        \ )
+  call SpaceVim#layers#edit#add_ft_head_tamplate('sh', s:bash_file_head)
   call SpaceVim#layers#edit#add_ft_head_tamplate('zsh', [
         \ '#!/usr/bin/env zsh',
         \ '',
@@ -64,3 +59,13 @@ function! s:go_to_def() abort
     call SpaceVim#lsp#go_to_def()
   endif
 endfunction
+
+
+let s:bash_file_head = ['#!/usr/bin/env bash',
+      \ '',
+      \ ''
+      \ ]
+
+function! SpaceVim#layers#lang#sh#set_variable(var) abort
+  let s:bash_file_head = get(a:var, 'bash-file-head', s:bash_file_head)
+endfunction

test/api/vim.vader

@@ -0,0 +1,5 @@
+Execute ( SpaceVim api: vim ):
+  let &encoding = 'utf-8'
+  let vimapi = SpaceVim#api#import('vim')
+  AssertEqual vimapi.parse_string('sss `strftime("%Y-%m-%d")` sss'), 'sss ' .  strftime("%Y-%m-%d") . ' sss'
+  unlet vimapi