From cc7a77804b12d86251e71303d1887b48c43f13b2 Mon Sep 17 00:00:00 2001
From: Tom Ryder <tom@sanctum.geek.nz>
Date: Sun, 21 Aug 2016 23:02:35 +1200
Subject: Consolidate ed,bc,grep,ls.sh into one function

---
 sh/profile.d/options.sh | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 sh/profile.d/options.sh

(limited to 'sh/profile.d/options.sh')

diff --git a/sh/profile.d/options.sh b/sh/profile.d/options.sh
new file mode 100644
index 00000000..aa6bea06
--- /dev/null
+++ b/sh/profile.d/options.sh
@@ -0,0 +1,55 @@
+# Cache the options available to certain programs. Run all this in a subshell
+# (none of its state needs to endure in the session)
+(
+options() { (
+
+    # Check or create the directory to cache the options
+    dir=$HOME/.cache/$1
+
+    # Directory already exists; bail out
+    [ -d "$dir" ] && exit
+
+    # Create the directory
+    mkdir -p -- "$dir" || exit
+    cd -- "$dir" || exit
+
+    # Write grep(1)'s --help output to a file, even if it's empty
+    "$1" --help </dev/null >help 2>/dev/null || exit
+
+    # Shift the program name off; remaining arguments are the options to check
+    shift
+
+    # Iterate through some useful options and create files to show they're
+    # available if found in the help output
+    for opt ; do
+        grep -q -- '[^[:alnum:]]--'"$opt"'[^[:alnum:]]' help &&
+            touch -- "$opt"
+    done
+) ; }
+
+# Cache options for bc(1)
+options bc \
+    quiet
+
+# Cache options for ed(1)
+options ed \
+    verbose
+
+# Cache options for grep(1)
+options grep \
+    binary-files \
+    color        \
+    devices      \
+    directories  \
+    exclude      \
+    exclude-dir
+
+# Cache options for ls(1)
+options ls \
+    almost-all     \
+    block-size     \
+    classify       \
+    color          \
+    human-readable \
+    time-style
+)
-- 
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