Adds hdl_checker LSP support (#2804)

* Added hdl_checker support
* Added hdl_checker tests

HDL Checker searches for files when no config file is found, which could lead to very long searches when the user is not really on a project setting

ale_linters/verilog/hdl_checker.vim

@@ -0,0 +1,5 @@
+" Author:      suoto <andre820@gmail.com>
+" Description: Adds support for HDL Code Checker, which wraps vcom/vlog, ghdl
+"              or xvhdl. More info on https://github.com/suoto/hdl_checker
+
+call ale#handlers#hdl_checker#DefineLinter('verilog')

ale_linters/vhdl/hdl_checker.vim

@@ -0,0 +1,5 @@
+" Author:      suoto <andre820@gmail.com>
+" Description: Adds support for HDL Code Checker, which wraps vcom/vlog, ghdl
+"              or xvhdl. More info on https://github.com/suoto/hdl_checker
+
+call ale#handlers#hdl_checker#DefineLinter('vhdl')

autoload/ale/handlers/hdl_checker.vim

@@ -0,0 +1,71 @@
+" Author:      suoto <andre820@gmail.com>
+" Description: Adds support for HDL Code Checker, which wraps vcom/vlog, ghdl
+"              or xvhdl. More info on https://github.com/suoto/hdl_checker
+
+call ale#Set('hdl_checker_executable', 'hdl_checker')
+call ale#Set('hdl_checker_config_file', has('unix') ? '.hdl_checker.config' : '_hdl_checker.config')
+call ale#Set('hdl_checker_options', '')
+
+" Use this as a function so we can mock it on testing. Need to do this because
+" test files are inside /testplugin (which refers to the ale repo), which will
+" always have a .git folder
+function! ale#handlers#hdl_checker#IsDotGit(path) abort
+    return ! empty(a:path) && isdirectory(a:path)
+endfunction
+
+" Sould return (in order of preference)
+" 1. Nearest config file
+" 2. Nearest .git directory
+" 3. The current path
+function! ale#handlers#hdl_checker#GetProjectRoot(buffer) abort
+    let l:project_root = ale#path#FindNearestFile(
+    \   a:buffer,
+    \   ale#Var(a:buffer, 'hdl_checker_config_file'))
+
+    if !empty(l:project_root)
+        return fnamemodify(l:project_root, ':h')
+    endif
+
+    " Search for .git to use as root
+    let l:project_root = ale#path#FindNearestDirectory(a:buffer, '.git')
+
+    if ale#handlers#hdl_checker#IsDotGit(l:project_root)
+        return fnamemodify(l:project_root, ':h:h')
+    endif
+endfunction
+
+function! ale#handlers#hdl_checker#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'hdl_checker_executable')
+endfunction
+
+function! ale#handlers#hdl_checker#GetCommand(buffer) abort
+    let l:command = ale#Escape(ale#handlers#hdl_checker#GetExecutable(a:buffer)) . ' --lsp'
+
+    " Add extra parameters only if config has been set
+    let l:options = ale#Var(a:buffer, 'hdl_checker_options')
+
+    if ! empty(l:options)
+        let l:command = l:command . ' ' . l:options
+    endif
+
+    return l:command
+endfunction
+
+" To allow testing
+function! ale#handlers#hdl_checker#GetInitOptions(buffer) abort
+    return {'project_file': ale#Var(a:buffer, 'hdl_checker_config_file')}
+endfunction
+
+" Define the hdl_checker linter for a given filetype.
+function! ale#handlers#hdl_checker#DefineLinter(filetype) abort
+    call ale#linter#Define(a:filetype, {
+    \   'name': 'hdl-checker',
+    \   'lsp': 'stdio',
+    \   'language': a:filetype,
+    \   'executable': function('ale#handlers#hdl_checker#GetExecutable'),
+    \   'command': function('ale#handlers#hdl_checker#GetCommand'),
+    \   'project_root': function('ale#handlers#hdl_checker#GetProjectRoot'),
+    \   'initialization_options': function('ale#handlers#hdl_checker#GetInitOptions'),
+    \ })
+endfunction
+

doc/ale-verilog.txt

@@ -3,7 +3,10 @@ ALE Verilog/SystemVerilog Integration                     *ale-verilog-options*
 
 
 ===============================================================================
-ALE can use four different linters for Verilog HDL:
+ALE can use five different linters for Verilog HDL:
+
+  HDL Checker
+    Using `hdl_checker --lsp`
 
   iverilog:
     Using `iverilog -t null -Wall`
@@ -26,6 +29,9 @@ defining 'g:ale_linters' variable:
     \ let g:ale_linters = {'systemverilog' : ['verilator'],}
 <
 
+===============================================================================
+General notes
+
 Linters/compilers that utilize a "work" directory for analyzing designs- such
 as ModelSim and Vivado- can be passed the location of these directories as
 part of their respective option strings listed below. This is useful for
@@ -40,6 +46,16 @@ changing. This can happen in the form of hangs or crashes. To help prevent
 this when using these linters, it may help to run linting less frequently; for
 example, only when a file is saved.
 
+HDL Checker is an alternative for some of the issues described above. It wraps
+around ghdl, Vivado and ModelSim/Questa and, when using the latter, it can
+handle mixed language (VHDL, Verilog, SystemVerilog) designs.
+
+===============================================================================
+hdl-checker                                           *ale-verilog-hdl-checker*
+
+See |ale-vhdl-hdl-checker|
+
+
 ===============================================================================
 iverilog                                                 *ale-verilog-iverilog*
 

doc/ale-vhdl.txt

@@ -3,10 +3,10 @@ ALE VHDL Integration                                         *ale-vhdl-options*
 
 
 ===============================================================================
-ALE can use three different linters for VHDL:
+ALE can use four different linters for VHDL:
 
-  iverilog:
-    Using `iverilog -t null -Wall`
+  ghdl:
+    Using `ghdl --std=08`
 
   ModelSim/Questa
     Using `vcom -2008 -quiet -lint`
@@ -14,8 +14,15 @@ ALE can use three different linters for VHDL:
   Vivado
     Using `xvhdl --2008`
 
-Note all linters default to VHDL-2008 support. This, and other options, can be
-changed with each linter's respective option variable.
+  HDL Checker
+    Using `hdl_checker --lsp`
+
+===============================================================================
+General notes
+
+ghdl, ModelSim/Questa and Vivado linters default to VHDL-2008 support. This,
+and other options, can be changed with each linter's respective option
+variable.
 
 Linters/compilers that utilize a "work" directory for analyzing designs- such
 as ModelSim and Vivado- can be passed the location of these directories as
@@ -31,6 +38,10 @@ changing. This can happen in the form of hangs or crashes. To help prevent
 this when using these linters, it may help to run linting less frequently; for
 example, only when a file is saved.
 
+HDL Checker is an alternative for some of the issues described above. It wraps
+around ghdl, Vivado and ModelSim/Questa and, when using the latter, it can
+handle mixed language (VHDL, Verilog, SystemVerilog) designs.
+
 ===============================================================================
 ghdl                                                            *ale-vhdl-ghdl*
 
@@ -50,6 +61,60 @@ g:ale_vhdl_ghdl_options                               *g:ale_vhdl_ghdl_options*
   This variable can be changed to modify the flags/options passed to 'ghdl'.
 
 
+===============================================================================
+hdl-checker                                              *ale-vhdl-hdl-checker*
+
+HDL Checker is a wrapper for VHDL/Verilg/SystemVerilog tools that aims to
+reduce the boilerplate code needed to set things up. It can automatically
+infer libraries for VHDL sources, determine the compilation order and provide
+some static checks.
+
+You can install it using pip:
+>
+  $ pip install hdl-checker
+
+`hdl-checker` will be run from a detected project root, determined by the
+following methods, in order:
+
+1. Find the first directory containing a configuration file (see
+   |g:ale_hdl_checker_config_file|)
+2. If no configuration file can be found, find the first directory containing
+   a folder named `'.git'
+3. If no such folder is found, use the directory of the current buffer
+
+
+g:ale_hdl_checker_executable
+                                                 *g:ale_hdl_checker_executable*
+                                                 *b:ale_hdl_checker_executable*
+  Type: |String|
+  Default: `'hdl_checker'`
+
+  This variable can be changed to the path to the 'hdl_checker' executable.
+
+
+g:ale_hdl_checker_options                           *g:ale_hdl_checker_options*
+                                                    *b:ale_hdl_checker_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be changed to modify the flags/options passed to the
+  'hdl_checker' server startup command.
+
+
+g:ale_hdl_checker_config_file                   *g:ale_hdl_checker_config_file*
+                                                *b:ale_hdl_checker_config_file*
+  Type: |String|
+  Default: `'.hdl_checker.config'` (Unix),
+           `'_hdl_checker.config'` (Windows)
+
+  This variable can be changed to modify the config file HDL Checker will try
+  to look for. It will also affect how the project's root directory is
+  determined (see |ale-vhdl-hdl-checker|).
+
+  More info on the configuration file format can be found at:
+  https://github.com/suoto/hdl_checker/wiki/Setting-up-a-project
+
+
 ===============================================================================
 vcom                                                            *ale-vhdl-vcom*
 

doc/ale.txt

@@ -2675,12 +2675,14 @@ documented in additional help files.
   vala....................................|ale-vala-options|
     uncrustify............................|ale-vala-uncrustify|
   verilog/systemverilog...................|ale-verilog-options|
+    hdl-checker...........................|ale-verilog-hdl-checker|
     iverilog..............................|ale-verilog-iverilog|
     verilator.............................|ale-verilog-verilator|
     vlog..................................|ale-verilog-vlog|
     xvlog.................................|ale-verilog-xvlog|
   vhdl....................................|ale-vhdl-options|
     ghdl..................................|ale-vhdl-ghdl|
+    hdl-checker...........................|ale-vhdl-hdl-checker|
     vcom..................................|ale-vhdl-vcom|
     xvhdl.................................|ale-vhdl-xvhdl|
   vim.....................................|ale-vim-options|

test/command_callback/hdl_server/with_git/files/foo.vhd

@@ -0,0 +1 @@
+

test/test_filetype_linter_defaults.vader

@@ -61,7 +61,7 @@ Execute(The defaults for the zsh filetype should be correct):
 Execute(The defaults for the verilog filetype should be correct):
   " This filetype isn't configured with default, so we can test loading all
   " available linters with this.
-  AssertEqual ['iverilog', 'verilator', 'vlog', 'xvlog'], GetLinterNames('verilog')
+  AssertEqual ['hdl-checker', 'iverilog', 'verilator', 'vlog', 'xvlog'], GetLinterNames('verilog')
 
   let g:ale_linters_explicit = 1
 

test/test_hdl_checker_options.vader

@@ -0,0 +1,78 @@
+Before:
+  call ale#assert#SetUpLinterTest('vhdl', 'hdl_checker')
+
+  Save g:ale_hdl_checker_config_file
+  Save g:ale_hdl_checker_options
+
+  let g:default_config_file = has('unix') ? '.hdl_checker.config' : '_hdl_checker.config'
+
+After:
+  Restore
+  call ale#assert#TearDownLinterTest()
+  unlet! g:default_config_file
+
+Execute(Get default initialization dict):
+  AssertEqual
+  \ {'project_file': g:default_config_file},
+  \ ale#handlers#hdl_checker#GetInitOptions(bufnr(''))
+
+Execute(Get custom initialization dict):
+  let g:ale_hdl_checker_config_file = 'some_file_name'
+
+  AssertEqual
+  \ {'project_file': 'some_file_name'},
+  \ ale#handlers#hdl_checker#GetInitOptions(bufnr(''))
+
+Execute(Get the checker command without extra user parameters):
+  AssertEqual
+  \ ale#Escape('hdl_checker') . ' --lsp',
+  \ ale#handlers#hdl_checker#GetCommand(bufnr(''))
+
+Execute(Get the checker command with user configured parameters):
+  let g:ale_hdl_checker_options = '--log-level DEBUG'
+
+  AssertEqual
+  \ ale#Escape('hdl_checker') . ' --lsp --log-level DEBUG',
+  \ ale#handlers#hdl_checker#GetCommand(bufnr(''))
+
+Execute(Customize executable):
+  let g:ale_hdl_checker_executable = '/some/other/path'
+  AssertEqual
+  \ ale#Escape('/some/other/path') . ' --lsp',
+  \ ale#handlers#hdl_checker#GetCommand(bufnr(''))
+
+Execute(Get project root based on .git):
+  call ale#test#SetFilename('hdl_server/with_git/files/foo.vhd')
+  " Create .git file
+  silent! call mkdir(g:dir . '/hdl_server/with_git/.git')
+  AssertNotEqual '', glob(g:dir . '/hdl_server/with_git/.git')
+
+  AssertEqual
+  \ ale#path#Simplify(g:dir . '/hdl_server/with_git'),
+  \ ale#handlers#hdl_checker#GetProjectRoot(bufnr(''))
+
+Execute(Get project root based on config file):
+  call ale#test#SetFilename('hdl_server/with_config_file/foo.vhd')
+
+  AssertEqual
+  \ ale#path#Simplify(g:dir . '/hdl_server/with_config_file'),
+  \ ale#handlers#hdl_checker#GetProjectRoot(bufnr(''))
+
+Execute(Return no project root if neither .git or config file are found):
+  let g:call_count = 0
+
+  " Mock this command to avoid the test to find ale's own .git folder
+  function! ale#handlers#hdl_checker#IsDotGit(path) abort
+    let g:call_count += 1
+    return 0
+  endfunction
+
+  call ale#test#SetFilename('hdl_server/foo.vhd')
+
+  AssertEqual
+  \ '',
+  \ ale#handlers#hdl_checker#GetProjectRoot(bufnr(''))
+
+  AssertEqual g:call_count, 1
+
+  unlet! g:call_count