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==============================================================================
3. Syntax loading procedure *syntax-loading*
This explains the details that happen when the command ":syntax enable" is
issued. When Vim initializes itself, it finds out where the runtime files are
located. This is used here as the variable |$VIMRUNTIME|.
":syntax enable" and ":syntax on" do the following:
Source $VIMRUNTIME/syntax/syntax.vim
|
+- Clear out any old syntax by sourcing $VIMRUNTIME/syntax/nosyntax.vim
|
+- Source first syntax/synload.vim in 'runtimepath'
| |
| +- Set up syntax autocmds to load the appropriate syntax file when
| | the 'syntax' option is set. *synload-1*
| |
| +- Source the user's optional file, from the |mysyntaxfile| variable.
| This is for backwards compatibility with Vim 5.x only. *synload-2*
|
+- Do ":filetype on", which does ":runtime! filetype.vim". It loads any
| filetype.vim files found. It should always Source
| $VIMRUNTIME/filetype.vim, which does the following.
| |
| +- Install autocmds based on suffix to set the 'filetype' option
| | This is where the connection between file name and file type is
| | made for known file types. *synload-3*
| |
| +- Source the user's optional file, from the *myfiletypefile*
| | variable. This is for backwards compatibility with Vim 5.x only.
| | *synload-4*
| |
| +- Install one autocommand which sources scripts.vim when no file
| | type was detected yet. *synload-5*
| |
| +- Source $VIMRUNTIME/menu.vim, to setup the Syntax menu. |menu.vim|
|
+- Install a FileType autocommand to set the 'syntax' option when a file
| type has been detected. *synload-6*
|
+- Execute syntax autocommands to start syntax highlighting for each
already loaded buffer.
Upon loading a file, Vim finds the relevant syntax file as follows:
Loading the file triggers the BufReadPost autocommands.
|
+- If there is a match with one of the autocommands from |synload-3|
| (known file types) or |synload-4| (user's file types), the 'filetype'
| option is set to the file type.
|
+- The autocommand at |synload-5| is triggered. If the file type was not
| found yet, then scripts.vim is searched for in 'runtimepath'. This
| should always load $VIMRUNTIME/scripts.vim, which does the following.
| |
| +- Source the user's optional file, from the *myscriptsfile*
| | variable. This is for backwards compatibility with Vim 5.x only.
| |
| +- If the file type is still unknown, check the contents of the file,
| again with checks like "getline(1) =~ pattern" as to whether the
| file type can be recognized, and set 'filetype'.
|
+- When the file type was determined and 'filetype' was set, this
| triggers the FileType autocommand |synload-6| above. It sets
| 'syntax' to the determined file type.
|
+- When the 'syntax' option was set above, this triggers an autocommand
| from |synload-1| (and |synload-2|). This find the main syntax file in
| 'runtimepath', with this command:
| runtime! syntax/<name>.vim
|
+- Any other user installed FileType or Syntax autocommands are
triggered. This can be used to change the highlighting