Custom external tools

[mattstermiller]

Visual-Studio-style custom tools. Allow the user to maintain a list of tools as commands.

Tool properties:

• Name
• Exe Path
• Arguments
• Hide Window

Arguments support use of these variables:

• selected_items
• selected_files
• selected_folders
• cursor_item
• cursor_file
• cursor_folder
• location
• git_repo_root
• env:ENVIRONMENT_VARIABLE

Variable syntax:

• Braces around variable names: {selected_files}
• Brackets around optional arguments containing a variable: [--files {selected_files}]
• Optional colon and text after the name of a list variable (selected_*) to override the default space delimiter: {selected_files:,}
• If braces contain anything other than one of the defined variables, it is used literally
• If brackets do not contain a valid variable definition, it is used literally

When the tool is invoked:

• Bracketed arguments are only included if the variable within is defined and not empty
• If a variable outside of brackets has no value, the command is not executed and a message is given such as "Tool XYZ requires variable cursor_file."

Tool management:

• The Settings window will have new buttons to add, edit and delete tools from the Commands list
• Adding and editing will open a new Tool form to edit its properties
• Delimiter definitions in Arguments variables will not be allowed for non-list variables

The existing commands Open Commandline and Open With Text Editor will be replaced with pre-defined tools that behave the same way.