[bash,zsh] Separate common functions into "shell/common.sh"

1 files changed, 38 insertions, 0 deletions

diff --git a/shell/common.sh b/shell/common.sh
new file mode 100644
index 00000000..6866f0be
--- /dev/null
+++ b/shell/common.sh
@@ -0,0 +1,38 @@
+
+__fzf_defaults() {
+  # $1: Prepend to FZF_DEFAULT_OPTS_FILE and FZF_DEFAULT_OPTS
+  # $2: Append to FZF_DEFAULT_OPTS_FILE and FZF_DEFAULT_OPTS
+  printf '%s\n' "--height ${FZF_TMUX_HEIGHT:-40%} --min-height 20+ --bind=ctrl-z:ignore $1"
+  command cat "${FZF_DEFAULT_OPTS_FILE-}" 2> /dev/null
+  printf '%s\n' "${FZF_DEFAULT_OPTS-} $2"
+}
+
+__fzf_exec_awk() {
+  # This function performs `exec awk "$@"` safely by working around awk
+  # compatibility issues.
+  #
+  # To reduce an extra fork, this function performs "exec" so is expected to be
+  # run as the last command in a subshell.
+  if [[ -z ${__fzf_awk-} ]]; then
+    __fzf_awk=awk
+    if [[ $OSTYPE == solaris* && -x /usr/xpg4/bin/awk ]]; then
+      # Note: Solaris awk at /usr/bin/awk is meant for backward compatibility
+      # with an ancient implementation of 1977 awk in the original UNIX.  It
+      # lacks many features of POSIX awk, so it is essentially useless in the
+      # modern point of view.  To use a standard-conforming version in Solaris,
+      # one needs to explicitly use /usr/xpg4/bin/awk.
+      __fzf_awk=/usr/xpg4/bin/awk
+    else
+      # choose the faster mawk if: it's installed && build date >= 20230322 &&
+      # version >= 1.3.4
+      local n x y z d
+      IFS=' .' read n x y z d <<< $(command mawk -W version 2> /dev/null)
+      [[ $n == mawk ]] && (( d >= 20230302 && (x * 1000 + y) * 1000 + z >= 1003004 )) && __fzf_awk=mawk
+    fi
+  fi
+  # Note: macOS awk has a quirk that it stops processing at all when it sees
+  # any data not following UTF-8 in the input stream when the current LC_CTYPE
+  # specifies the UTF-8 encoding.  To work around this quirk, one needs to
+  # specify LC_ALL=C to change the current encoding to the plain one.
+  LC_ALL=C exec "$__fzf_awk" "$@"
+}