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Now there there is a new way to prompt for text, we can reimplement the
long abandoned editor_prompt function and use it to allow saving to new
files.
The new editor_prompt function takes a callback that will be called
after the user presses enter on the prompt.
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Since this mode will also be used to accept input for setting the
filename, searching for a string and possibly more, it makes more sense
for this mode to be called prompt mode. There is also less ambiguity
between normal mode because sometimes that is also called command mode.
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This way any extra stuff such as clearing the command line buffer or
setting the flag to ignore the extra first key can be automatically set.
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This first step allows you to press the semicolon key to enter command
mode, where you can type into a command line. Currently, pressing enter
when in command mode will clear the command line but since there are no
commands implemented it doesn't matter what you type in there.
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This name is a little bit better I think, and it will be nice to have a
distinction between this utility and the 'file' kind of buffer.
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Previously, the editor would print visible lines plus the statusline and
message bar into a buffer, then the window would display this entire
buffer. This refactor makes the window directly read lines from the
editor and individually display them on the screen. This will make it
easier to do syntax highlighting, since that information is stored per
line. The statusline and message line are still printed into a buffer to
be displayed by the window, but they are now positioned from the bottom
of the screen.
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For whatever reason lines were called rows in the code, so this refactor
changes that name everywhere. The name 'row' is still used in some
places to refer to the unit of height in the screen.
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This fixes the problem where the key used to enter insert mode ('i' for
example) would also be typed into the document.
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This makes the editor behave more like vi, with a seperate insert mode.
This also refactors the keyboard input code to pass the SDL_Keysym
structure to input.c and to use the SDL_TEXTINPUT event for editing
text.
SDL's text input event already fixes typing capital letters with shift,
and should make it possible to enter text using an IME, however most
unicode characters aren't properly rendered.
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This is based off of snaptoken's "Build Your Own Text Editor" tutorial
at https://viewsourcecode.org/snaptoken/kilo/.
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