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Guidelines on Code Modification
===============================

Coding Style
------------

* Use syntax compatible to both python 2.6 and 3.1.
* Use docstrings with pydoc in mind
* Follow the style guide for python code:
    http://www.python.org/dev/peps/pep-0008/
* Test the code with "doctest" where it makes sense


Patches
-------

Send patches, created with "git format-patch", to the email adress

    hut@lavabit.com

If you plan to do major changes, or many changes over time, I encourage
you to create a fork on GitHub, Gitorious or any other site.


Starting Points
---------------

Good places to read about ranger internals are:
ranger/core/actions.py
ranger/fsobject/fsobject.py

About the UI:
ranger/gui/widgets/browsercolumn.py
ranger/gui/widgets/browserview.py
ranger/gui/ui.py


Common Changes
--------------

* Change which files are previewed in the auto preview:
In ranger/fsobject/file.py
the constant PREVIEW_BLACKLIST

* Adding options:
In ranger/config/options.py
add the default value, like: my_option = True
In ranger/container/settings.py
add the name of your option to the constant ALLOWED_SETTINGS

The setting is now accessible at self.settings.my_option,
assuming <self> is a "SettingsAware" object.

* Adding colorschemes:
Copy ranger/colorschemes/default.py to ranger/colorschemes/myscheme.py
and modify it according to your needs.  Alternatively, mimic the jungle
colorscheme.  It subclasses the default scheme and just modifies a few things.
In ranger/config/options.py (or ~/.config/ranger/options.py), change
    colorscheme = 'default'
to: colorscheme = 'myscheme'

* Change the file type => application associations:
In ranger/config/apps.py
modify the method app_default.
The variable "f" is a filesystem-object with attributes like mimetype,
extension, etc.  For a full list, check ranger/fsobject/fsobject.py

* Change the file extension => mime type associations:
Modify ranger/data/mime.types


Version Numbering
-----------------

Three numbers;  The first changes on a rewrite, the second changes when major
configuration incompatibilities occur and the third changes with each release.
="k">static void drawsquare(Bool filled, Bool empty, unsigned long col[ColLast]) { int x; XGCValues gcv; XRectangle r = { dc.x, dc.y, dc.w, dc.h }; gcv.foreground = col[ColFG]; XChangeGC(dpy, dc.gc, GCForeground, &gcv); x = (dc.font.ascent + dc.font.descent + 2) / 4; r.x = dc.x + 1; r.y = dc.y + 1; if(filled) { r.width = r.height = x + 1; XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1); } else if(empty) { r.width = r.height = x; XDrawRectangles(dpy, dc.drawable, dc.gc, &r, 1); } } static Bool isoccupied(unsigned int t) { Client *c; for(c = clients; c; c = c->next) if(c->tags[t]) return True; return False; } static unsigned int textnw(const char *text, unsigned int len) { XRectangle r; if(dc.font.set) { XmbTextExtents(dc.font.set, text, len, NULL, &r); return r.width; } return XTextWidth(dc.font.xfont, text, len); } /* extern */ void drawstatus(void) { int i, x; dc.x = dc.y = 0; for(i = 0; i < ntags; i++) { dc.w = textw(tags[i]); if(seltag[i]) { drawtext(tags[i], dc.sel); drawsquare(sel && sel->tags[i], isoccupied(i), dc.sel); } else { drawtext(tags[i], dc.norm); drawsquare(sel && sel->tags[i], isoccupied(i), dc.norm); } dc.x += dc.w; } dc.w = blw; drawtext(lt->symbol, dc.norm); x = dc.x + dc.w; dc.w = textw(stext); dc.x = sw - dc.w; if(dc.x < x) { dc.x = x; dc.w = sw - x; } drawtext(stext, dc.norm); if((dc.w = dc.x - x) > bh) { dc.x = x; if(sel) { drawtext(sel->name, dc.sel); drawsquare(sel->ismax, sel->isfloating, dc.sel); } else drawtext(NULL, dc.norm); } XCopyArea(dpy, dc.drawable, barwin, dc.gc, 0, 0, sw, bh, 0, 0); XSync(dpy, False); } void drawtext(const char *text, unsigned long col[ColLast]) { int x, y, w, h; static char buf[256]; unsigned int len, olen; XRectangle r = { dc.x, dc.y, dc.w, dc.h }; XSetForeground(dpy, dc.gc, col[ColBG]); XFillRectangles(dpy, dc.drawable, dc.gc, &r, 1); if(!text) return; w = 0; olen = len = strlen(text); if(len >= sizeof buf) len = sizeof buf - 1; memcpy(buf, text, len); buf[len] = 0; h = dc.font.ascent + dc.font.descent; y = dc.y + (dc.h / 2) - (h / 2) + dc.font.ascent; x = dc.x + (h / 2); /* shorten text if necessary */ while(len && (w = textnw(buf, len)) > dc.w - h) buf[--len] = 0; if(len < olen) { if(len > 1) buf[len - 1] = '.'; if(len > 2) buf[len - 2] = '.'; if(len > 3) buf[len - 3] = '.'; } if(w > dc.w) return; /* too long */ XSetForeground(dpy, dc.gc, col[ColFG]); if(dc.font.set) XmbDrawString(dpy, dc.drawable, dc.font.set, dc.gc, x, y, buf, len); else XDrawString(dpy, dc.drawable, dc.gc, x, y, buf, len); } unsigned int textw(const char *text) { return textnw(text, strlen(text)) + dc.font.height; }