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calling `execlineb -c` has unfortunate quoting issues, cause for
cornercases like arguments that contain spaces or `"` the result would
be a completely broken command line.
Instead, let’s do our own block construction in a small rust
program (for speed). I tried implementing it in bash first but even
prepending spaces to a string is a complete waste of time in that
language.
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Since the goal of using `e` with argv is interactive execution of
block-style commands from the command line, the use of { and } for
blocks is sub-optimal, since bash (and ostensibly also fish) interpret
them as metacharacters and assign some semantics.
[ and ] on the other hand are not taken (apart from the `[`
executable, which is only relevant in command position and can always
be replaced by the `test` command). So we translate a stand-alone "["
argument to "{" and the same for "]"/"}", giving us a transparent
block syntax.
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Often times I want to execute “block-style” programs directly, but it
is rather inconvenient to type out `execlineb -c "…"` every time, plus
-c wants the argv as a single string instead of an argv.
The alternative, using the block representation with leading spaces,
is even less ergonomic.
So instead of
execlineb -c "nix-run { -A pkgs.profpatsch.e ~/vuizvui } echo hello"
or even
nix-run ' -A' ' pkgs.profpatsch.e' ' /home/me/vuizvui' '' echo hello
I can now write
e nix-run { -A pkgs.profpatsch.e ~/vuizvui } echo hello
and it will work as expected (provided your shell expands inside {}
blocks, which bash does but fish doesn’t for some reason).
If no argument is passed, e falls back to opening a shell prompt.
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rlwrap has to do magic recognition, which breaks in most cases.
We can just print a prompt before the first and after each consecutive
command. Seems to work wonderfully.
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Forgot the cat after I added forstdin.
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