Add support for configurable extra fzf arguments

via the environment variable _ZO_FZF_EXTRA_ARGS

Cargo.lock

@@ -311,6 +311,11 @@ dependencies = [
  "syn 1.0.17 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "shlex"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -433,6 +438,7 @@ dependencies = [
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs 2.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)",
+ "shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -477,6 +483,7 @@ dependencies = [
 "checksum rust-argon2 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2bc8af4bda8e1ff4932523b94d3dd20ee30a87232323eda55903ffd71d2fb017"
 "checksum serde 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)" = "36df6ac6412072f67cf767ebbde4133a5b2e88e76dc6187fa7104cd16f783399"
 "checksum serde_derive 1.0.106 (registry+https://github.com/rust-lang/crates.io-index)" = "9e549e3abf4fb8621bd1609f11dfc9f5e50320802273b12f3811a67e6716ea6c"
+"checksum shlex 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "c8faa2719539bbe9d77869bfb15d4ee769f99525e707931452c97b693b3f159d"
 "checksum structopt-derive 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3f88b8e18c69496aad6f9ddf4630dd7d585bcaf765786cb415b9aec2fe5a0430"

Cargo.toml

@@ -18,6 +18,7 @@ bincode = "1.2.1"
 clap = "2.33.0"
 dirs = "2.0.2"
 serde = { version = "1.0.106", features = ["derive"] }
+shlex = "0.1.1"
 structopt = "0.3.12"
 uuid = { version = "0.8.1", features = ["v4"] }
 

README.md

@@ -129,6 +129,7 @@ NOTE: PWD hooks are currently not supported for POSIX shells.
   characters ("`:`" on Linux and macOS, and "`;`" on Windows) to be excluded from
   the database
 - `$_ZO_MAXAGE`: sets the maximum total rank after which entries start getting deleted
+- `$_ZO_FZF_EXTRA_ARGS`: extra arguments to pass to fzf, e.g. `--height 25`
 
 [`dirs` documentation]: https://docs.rs/dirs/latest/dirs/fn.data_local_dir.html
 

src/config.rs

@@ -2,6 +2,7 @@ use crate::db::DBVersion;
 use crate::dir::Rank;
 
 use anyhow::{bail, Context, Result};
+use shlex;
 
 use std::env;
 use std::fs;
@@ -51,3 +52,19 @@ pub fn zo_maxage() -> Result<Rank> {
         None => Ok(1000.0),
     }
 }
+
+pub fn zo_fzf_extra_args() -> Result<Vec<String>> {
+    match env::var_os("_ZO_FZF_EXTRA_ARGS") {
+        Some(fzf_args_osstr) => match fzf_args_osstr.to_str() {
+            Some(fzf_args) => {
+                if let Some(args) = shlex::split(fzf_args) {
+                    Ok(args)
+                } else {
+                    bail!("Error parsing _ZO_FZF_EXTRA_ARGS");
+                }
+            }
+            None => bail!("invalid Unicode in _ZO_FZF_EXTRA_ARGS"),
+        },
+        None => Ok(vec![]),
+    }
+}

src/util.rs

@@ -76,6 +76,7 @@ where
 {
     let mut fzf = Command::new("fzf")
         .args(&["-n2..", "--no-sort"])
+        .args(config::zo_fzf_extra_args()?)
         .stdin(Stdio::piped())
         .stdout(Stdio::piped())
         .spawn()