We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/fish_breakpoint_prompt.rst

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+.. _cmd-fish_breakpoint_prompt:
+
+fish_breakpoint_prompt - define the prompt when stopped at a breakpoint
+=======================================================================
+
+Synopsis
+--------
+
+::
+
+    function fish_breakpoint_prompt
+        ...
+    end
+
+
+Description
+-----------
+
+By defining the ``fish_breakpoint_prompt`` function, the user can choose a custom prompt when asking for input in response to a :ref:`breakpoint <cmd-breakpoint>` command. The ``fish_breakpoint_prompt`` function is executed when the prompt is to be shown, and the output is used as a prompt.
+
+The exit status of commands within ``fish_breakpoint_prompt`` will not modify the value of :ref:`$status <variables-status>` outside of the ``fish_breakpoint_prompt`` function.
+
+``fish`` ships with a default version of this function that displays the function name and line number of the current execution context.
+
+
+Example
+-------
+
+A simple prompt that is a simplified version of the default debugging prompt::
+
+    function fish_breakpoint_prompt -d "Write out the debug prompt"
+        set -l function (status current-function)
+        set -l line (status current-line-number)
+        set -l prompt "$function:$line >"
+        echo -ns (set_color $fish_color_status) "BP $prompt" (set_color normal) ' '
+    end
+